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<a href="#define-members">Macros</a> |
<a href="#func-members">Functions</a> </div>
<div class="headertitle"><div class="title">Attributes (H5A)</div></div>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>An HDF5 attribute is a small metadata object describing the nature and/or intended usage of a primary data object. A primary data object may be a dataset, group, or committed datatype.</p>
<dl class="section see"><dt>See also</dt><dd>sec_attribute </dd></dl>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga4a76e4e5ab6eb0fd2aa7990d38d55f24" id="r_ga4a76e4e5ab6eb0fd2aa7990d38d55f24"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate</a>   <a class="el" href="#ga4f4e5248c09f689633079ed8afc0b308">H5Acreate2</a></td></tr>
<tr class="separator:ga4a76e4e5ab6eb0fd2aa7990d38d55f24"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab9dcfc543cd4282f32b8ea19e08ffa6c" id="r_gab9dcfc543cd4282f32b8ea19e08ffa6c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="#gab9dcfc543cd4282f32b8ea19e08ffa6c">H5Aiterate</a>   <a class="el" href="#ga9315a22b60468b6e996559b1b8a77251">H5Aiterate2</a></td></tr>
<tr class="separator:gab9dcfc543cd4282f32b8ea19e08ffa6c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaef4394b661e2c930879e9868e122bdda" id="r_gaef4394b661e2c930879e9868e122bdda"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaef4394b661e2c930879e9868e122bdda">H5Aclose</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id)</td></tr>
<tr class="memdesc:gaef4394b661e2c930879e9868e122bdda"><td class="mdescLeft"> </td><td class="mdescRight">Closes the specified attribute. <br /></td></tr>
<tr class="separator:gaef4394b661e2c930879e9868e122bdda"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4f4e5248c09f689633079ed8afc0b308" id="r_ga4f4e5248c09f689633079ed8afc0b308"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga4f4e5248c09f689633079ed8afc0b308">H5Acreate2</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> type_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> space_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> acpl_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> aapl_id)</td></tr>
<tr class="memdesc:ga4f4e5248c09f689633079ed8afc0b308"><td class="mdescLeft"> </td><td class="mdescRight">Creates an attribute attached to a specified object. <br /></td></tr>
<tr class="separator:ga4f4e5248c09f689633079ed8afc0b308"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga004160c28e281455ec48aa7fe557ef8a" id="r_ga004160c28e281455ec48aa7fe557ef8a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga004160c28e281455ec48aa7fe557ef8a">H5Acreate_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, const char *attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> type_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> space_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> acpl_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> aapl_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:ga004160c28e281455ec48aa7fe557ef8a"><td class="mdescLeft"> </td><td class="mdescRight">Creates an attribute attached to a specified object. <br /></td></tr>
<tr class="separator:ga004160c28e281455ec48aa7fe557ef8a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gada9fa3d6db52329f1fd55662de6ff6ba" id="r_gada9fa3d6db52329f1fd55662de6ff6ba"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gada9fa3d6db52329f1fd55662de6ff6ba">H5Adelete</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *attr_name)</td></tr>
<tr class="memdesc:gada9fa3d6db52329f1fd55662de6ff6ba"><td class="mdescLeft"> </td><td class="mdescRight">Deletes an attribute from a specified location. <br /></td></tr>
<tr class="separator:gada9fa3d6db52329f1fd55662de6ff6ba"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga06711a4e77ff8ab49e427010fd38ac9e" id="r_ga06711a4e77ff8ab49e427010fd38ac9e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga06711a4e77ff8ab49e427010fd38ac9e">H5Adelete_by_idx</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a> idx_type, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a> order, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> n, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:ga06711a4e77ff8ab49e427010fd38ac9e"><td class="mdescLeft"> </td><td class="mdescRight">Deletes an attribute from an object according to index order. <br /></td></tr>
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<tr class="memitem:gacbf689308f851428dd641b64f5f94feb" id="r_gacbf689308f851428dd641b64f5f94feb"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gacbf689308f851428dd641b64f5f94feb">H5Adelete_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, const char *attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:gacbf689308f851428dd641b64f5f94feb"><td class="mdescLeft"> </td><td class="mdescRight">Removes an attribute from a specified location. <br /></td></tr>
<tr class="separator:gacbf689308f851428dd641b64f5f94feb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga293b5be270d90cd5e47f782ca9aec80b" id="r_ga293b5be270d90cd5e47f782ca9aec80b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#aa8f6c28736dbd0f18388c67911d38aca">htri_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga293b5be270d90cd5e47f782ca9aec80b">H5Aexists</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> obj_id, const char *attr_name)</td></tr>
<tr class="memdesc:ga293b5be270d90cd5e47f782ca9aec80b"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether an attribute with a given name exists on an object. <br /></td></tr>
<tr class="separator:ga293b5be270d90cd5e47f782ca9aec80b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa1d2305651a4524f6aa0f8b56eec1a37" id="r_gaa1d2305651a4524f6aa0f8b56eec1a37"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#aa8f6c28736dbd0f18388c67911d38aca">htri_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaa1d2305651a4524f6aa0f8b56eec1a37">H5Aexists_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> obj_id, const char *obj_name, const char *attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:gaa1d2305651a4524f6aa0f8b56eec1a37"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether an attribute with a given name exists on an object. <br /></td></tr>
<tr class="separator:gaa1d2305651a4524f6aa0f8b56eec1a37"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0f6b545850bd21f128904eff51df226d" id="r_ga0f6b545850bd21f128904eff51df226d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga0f6b545850bd21f128904eff51df226d">H5Aget_create_plist</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id)</td></tr>
<tr class="memdesc:ga0f6b545850bd21f128904eff51df226d"><td class="mdescLeft"> </td><td class="mdescRight">Gets an attribute creation property list identifier. <br /></td></tr>
<tr class="separator:ga0f6b545850bd21f128904eff51df226d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae3f1b7b87240b461f7827a8783acc08a" id="r_gae3f1b7b87240b461f7827a8783acc08a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gae3f1b7b87240b461f7827a8783acc08a">H5Aget_info</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id, <a class="el" href="struct_h5_a__info__t.html">H5A_info_t</a> *ainfo)</td></tr>
<tr class="memdesc:gae3f1b7b87240b461f7827a8783acc08a"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves attribute information by attribute identifier. <br /></td></tr>
<tr class="separator:gae3f1b7b87240b461f7827a8783acc08a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad110910cb227c15fdca938a642714fe9" id="r_gad110910cb227c15fdca938a642714fe9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gad110910cb227c15fdca938a642714fe9">H5Aget_info_by_idx</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a> idx_type, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a> order, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> n, <a class="el" href="struct_h5_a__info__t.html">H5A_info_t</a> *ainfo, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:gad110910cb227c15fdca938a642714fe9"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves attribute information by attribute index position. <br /></td></tr>
<tr class="separator:gad110910cb227c15fdca938a642714fe9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga258f03e12b4f49ad33ba72d17a9e2faf" id="r_ga258f03e12b4f49ad33ba72d17a9e2faf"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga258f03e12b4f49ad33ba72d17a9e2faf">H5Aget_info_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, const char *attr_name, <a class="el" href="struct_h5_a__info__t.html">H5A_info_t</a> *ainfo, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:ga258f03e12b4f49ad33ba72d17a9e2faf"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves attribute information by attribute name. <br /></td></tr>
<tr class="separator:ga258f03e12b4f49ad33ba72d17a9e2faf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga05e195aabab8c623b1c52009aeb99674" id="r_ga05e195aabab8c623b1c52009aeb99674"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#af629ed855824cf5955b54529adf78ad6">ssize_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga05e195aabab8c623b1c52009aeb99674">H5Aget_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id, size_t buf_size, char *buf)</td></tr>
<tr class="memdesc:ga05e195aabab8c623b1c52009aeb99674"><td class="mdescLeft"> </td><td class="mdescRight">Gets an attribute name. <br /></td></tr>
<tr class="separator:ga05e195aabab8c623b1c52009aeb99674"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4c552b2db32371f8ea20d87475313fb6" id="r_ga4c552b2db32371f8ea20d87475313fb6"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#af629ed855824cf5955b54529adf78ad6">ssize_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga4c552b2db32371f8ea20d87475313fb6">H5Aget_name_by_idx</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a> idx_type, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a> order, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> n, char *name, size_t size, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:ga4c552b2db32371f8ea20d87475313fb6"><td class="mdescLeft"> </td><td class="mdescRight">Gets an attribute name by attribute index position. <br /></td></tr>
<tr class="separator:ga4c552b2db32371f8ea20d87475313fb6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga9e21e544119d03f9342530b45a71d74d" id="r_ga9e21e544119d03f9342530b45a71d74d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga9e21e544119d03f9342530b45a71d74d">H5Aget_space</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id)</td></tr>
<tr class="memdesc:ga9e21e544119d03f9342530b45a71d74d"><td class="mdescLeft"> </td><td class="mdescRight">Gets a copy of the dataspace for an attribute. <br /></td></tr>
<tr class="separator:ga9e21e544119d03f9342530b45a71d74d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gabd11c8e11db0adde706e41a24a832f06" id="r_gabd11c8e11db0adde706e41a24a832f06"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gabd11c8e11db0adde706e41a24a832f06">H5Aget_storage_size</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id)</td></tr>
<tr class="memdesc:gabd11c8e11db0adde706e41a24a832f06"><td class="mdescLeft"> </td><td class="mdescRight">Returns the amount of storage used to store an attribute. <br /></td></tr>
<tr class="separator:gabd11c8e11db0adde706e41a24a832f06"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0b070b714b2e535df2e1cb3005026a44" id="r_ga0b070b714b2e535df2e1cb3005026a44"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga0b070b714b2e535df2e1cb3005026a44">H5Aget_type</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id)</td></tr>
<tr class="memdesc:ga0b070b714b2e535df2e1cb3005026a44"><td class="mdescLeft"> </td><td class="mdescRight">Gets an attribute's datatype. <br /></td></tr>
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<tr class="memitem:ga9315a22b60468b6e996559b1b8a77251" id="r_ga9315a22b60468b6e996559b1b8a77251"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga9315a22b60468b6e996559b1b8a77251">H5Aiterate2</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a> idx_type, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a> order, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *idx, <a class="el" href="_h5_apublic_8h.html#a28fef0ded9a6c0eb12334c0d15dc3e74">H5A_operator2_t</a> op, void *op_data)</td></tr>
<tr class="memdesc:ga9315a22b60468b6e996559b1b8a77251"><td class="mdescLeft"> </td><td class="mdescRight">Calls a user-defined function for each attribute on an object. <br /></td></tr>
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<tr class="memitem:ga75db973d69b61f673f5cdf21ac624cef" id="r_ga75db973d69b61f673f5cdf21ac624cef"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga75db973d69b61f673f5cdf21ac624cef">H5Aiterate_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a> idx_type, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a> order, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *idx, <a class="el" href="_h5_apublic_8h.html#a28fef0ded9a6c0eb12334c0d15dc3e74">H5A_operator2_t</a> op, void *op_data, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:ga75db973d69b61f673f5cdf21ac624cef"><td class="mdescLeft"> </td><td class="mdescRight">Calls user-defined function for each attribute on an object. <br /></td></tr>
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<tr class="memitem:ga59863b205b6d93b2145f0fbca49656f7" id="r_ga59863b205b6d93b2145f0fbca49656f7"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga59863b205b6d93b2145f0fbca49656f7">H5Aopen</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> obj_id, const char *attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> aapl_id)</td></tr>
<tr class="memdesc:ga59863b205b6d93b2145f0fbca49656f7"><td class="mdescLeft"> </td><td class="mdescRight">Opens an attribute for an object specified by object identifier and attribute name. <br /></td></tr>
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<tr class="memitem:gab1451cdff4f77dcf9feaee83c8179b2d" id="r_gab1451cdff4f77dcf9feaee83c8179b2d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gab1451cdff4f77dcf9feaee83c8179b2d">H5Aopen_by_idx</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a> idx_type, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a> order, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> n, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> aapl_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:gab1451cdff4f77dcf9feaee83c8179b2d"><td class="mdescLeft"> </td><td class="mdescRight">Opens the nth attribute attached to an object. <br /></td></tr>
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<tr class="memitem:gadb49a0b5b9798d2e944d877adba8ae10" id="r_gadb49a0b5b9798d2e944d877adba8ae10"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gadb49a0b5b9798d2e944d877adba8ae10">H5Aopen_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, const char *attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> aapl_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
<tr class="memdesc:gadb49a0b5b9798d2e944d877adba8ae10"><td class="mdescLeft"> </td><td class="mdescRight">Opens an attribute for an object by object name and attribute name. <br /></td></tr>
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<tr class="memitem:gaacb27a997f7c98e8a833d0fd63b58f1c" id="r_gaacb27a997f7c98e8a833d0fd63b58f1c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaacb27a997f7c98e8a833d0fd63b58f1c">H5Aread</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> type_id, void *buf)</td></tr>
<tr class="memdesc:gaacb27a997f7c98e8a833d0fd63b58f1c"><td class="mdescLeft"> </td><td class="mdescRight">Reads the value of an attribute. <br /></td></tr>
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<tr class="memitem:ga490dcd6db246c1fda7295badfce28203" id="r_ga490dcd6db246c1fda7295badfce28203"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga490dcd6db246c1fda7295badfce28203">H5Arename</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *old_name, const char *new_name)</td></tr>
<tr class="memdesc:ga490dcd6db246c1fda7295badfce28203"><td class="mdescLeft"> </td><td class="mdescRight">Renames an attribute. <br /></td></tr>
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<tr class="memitem:gab70871e205d57450c83efd9912be2b5c" id="r_gab70871e205d57450c83efd9912be2b5c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gab70871e205d57450c83efd9912be2b5c">H5Awrite</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> attr_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> type_id, const void *buf)</td></tr>
<tr class="memdesc:gab70871e205d57450c83efd9912be2b5c"><td class="mdescLeft"> </td><td class="mdescRight">Writes data to an attribute. <br /></td></tr>
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<tr class="memitem:ga21f8483c935d72187b98f5e7c2056140" id="r_ga21f8483c935d72187b98f5e7c2056140"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga21f8483c935d72187b98f5e7c2056140">H5Arename_by_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *obj_name, const char *old_attr_name, const char *new_attr_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> lapl_id)</td></tr>
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<tr class="memitem:gaa30f5f6c277d6c46f8aa31e89cdba085" id="r_gaa30f5f6c277d6c46f8aa31e89cdba085"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaa30f5f6c277d6c46f8aa31e89cdba085">H5Acreate1</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> type_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> space_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> acpl_id)</td></tr>
<tr class="memdesc:gaa30f5f6c277d6c46f8aa31e89cdba085"><td class="mdescLeft"> </td><td class="mdescRight">Creates an attribute attached to a specified object. <br /></td></tr>
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<tr class="memitem:gaadd809fc16238754105bbddd20bcdde1" id="r_gaadd809fc16238754105bbddd20bcdde1"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaadd809fc16238754105bbddd20bcdde1">H5Aget_num_attrs</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id)</td></tr>
<tr class="memdesc:gaadd809fc16238754105bbddd20bcdde1"><td class="mdescLeft"> </td><td class="mdescRight">Determines the number of attributes attached to an object. <br /></td></tr>
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<tr class="memitem:gabdb2cf7368eec0ad998cbe6a3f61aa41" id="r_gabdb2cf7368eec0ad998cbe6a3f61aa41"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gabdb2cf7368eec0ad998cbe6a3f61aa41">H5Aiterate1</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, unsigned *idx, <a class="el" href="_h5_apublic_8h.html#ae42c937252ed79a1ad4672f04adba750">H5A_operator1_t</a> op, void *op_data)</td></tr>
<tr class="memdesc:gabdb2cf7368eec0ad998cbe6a3f61aa41"><td class="mdescLeft"> </td><td class="mdescRight">Calls a user's function for each attribute on an object. <br /></td></tr>
<tr class="separator:gabdb2cf7368eec0ad998cbe6a3f61aa41"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gadaa85276f2731ad78462a6fd27118470" id="r_gadaa85276f2731ad78462a6fd27118470"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gadaa85276f2731ad78462a6fd27118470">H5Aopen_idx</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, unsigned idx)</td></tr>
<tr class="memdesc:gadaa85276f2731ad78462a6fd27118470"><td class="mdescLeft"> </td><td class="mdescRight">Opens the attribute specified by its index. <br /></td></tr>
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<tr class="memitem:ga5c05fade96b6b7e2299f56a5b1edb1c1" id="r_ga5c05fade96b6b7e2299f56a5b1edb1c1"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga5c05fade96b6b7e2299f56a5b1edb1c1">H5Aopen_name</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *name)</td></tr>
<tr class="memdesc:ga5c05fade96b6b7e2299f56a5b1edb1c1"><td class="mdescLeft"> </td><td class="mdescRight">Opens an attribute specified by name. <br /></td></tr>
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</table>
<h2 class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">◆ </a></span>H5Acreate</h2>
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<td class="memname">#define H5Acreate   <a class="el" href="#ga4f4e5248c09f689633079ed8afc0b308">H5Acreate2</a></td>
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<p><a class="el" href="#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a> is a macro that is mapped to either <a class="el" href="#gaa30f5f6c277d6c46f8aa31e89cdba085" title="Creates an attribute attached to a specified object.">H5Acreate1()</a> or <a class="el" href="#ga4f4e5248c09f689633079ed8afc0b308" title="Creates an attribute attached to a specified object.">H5Acreate2()</a>.<br />
</p><dl class="section see"><dt>See also</dt><dd><a class="el" href="api-compat-macros.html">API Compatibility Macros</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab9dcfc543cd4282f32b8ea19e08ffa6c">◆ </a></span>H5Aiterate</h2>
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<td class="memname">#define H5Aiterate   <a class="el" href="#ga9315a22b60468b6e996559b1b8a77251">H5Aiterate2</a></td>
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<p><a class="el" href="#gab9dcfc543cd4282f32b8ea19e08ffa6c">H5Aiterate()</a> is a macro that is mapped to either <a class="el" href="#gabdb2cf7368eec0ad998cbe6a3f61aa41" title="Calls a user's function for each attribute on an object.">H5Aiterate1()</a> or <a class="el" href="#ga9315a22b60468b6e996559b1b8a77251" title="Calls a user-defined function for each attribute on an object.">H5Aiterate2()</a>.<br />
</p><dl class="section see"><dt>See also</dt><dd><a class="el" href="api-compat-macros.html">API Compatibility Macros</a> </dd></dl>
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</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="gaef4394b661e2c930879e9868e122bdda" name="gaef4394b661e2c930879e9868e122bdda"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaef4394b661e2c930879e9868e122bdda">◆ </a></span>H5Aclose()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aclose </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em></span></td><td>)</td>
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<p>Closes the specified attribute. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> terminates access to the attribute through <code>attr_id</code> and releases the identifier.</p>
<dl class="section user"><dt>Example</dt><dd><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_acpl, fail_attr, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file, acpl, fspace, attr;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a5a2d6726f9ad8d2bca8df2b817e5ad6a">H5F_ACC_TRUNC</a>;</div>
<div class="line"> <span class="keywordtype">char</span> file_name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> <span class="comment">// attribute names can be arbitrary Unicode strings</span></div>
<div class="line"> <span class="keywordtype">char</span> attr_name[] = <span class="stringliteral">"Χαρακτηριστικό"</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gae64b51ee9ac0781bc4ccc599d98387f4">H5Fcreate</a>(file_name, mode, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> ((acpl = <a class="code hl_function" href="group___p_l_c_r.html#gaf1b11da01d4d45d788c45f8bc5f0cbfa">H5Pcreate</a>(<a class="code hl_define" href="_h5_ppublic_8h.html#aa0102211c679e031e2e9831b66c48a12">H5P_ATTRIBUTE_CREATE</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_acpl;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// use UTF-8 encoding for the attribute name</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code hl_function" href="group___a_c_p_l.html#gad4fa8e2d17236786f770cf17eef908cc">H5Pset_char_encoding</a>(acpl, <a class="code hl_enumvalue" href="_h5_tpublic_8h.html#a03755b8370672668ddc7063add28e71aa41685667f69bf81eb7de5dd5f452e658">H5T_CSET_UTF8</a>) < 0) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_fspace;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// create a scalar (singleton) attribute</span></div>
<div class="line"> <span class="keywordflow">if</span> ((fspace = <a class="code hl_function" href="group___h5_s.html#gabee514327cba34ca9951b24fa14fb083">H5Screate</a>(<a class="code hl_enumvalue" href="_h5_spublic_8h.html#ae53f3c6a52563646fbac9ead8ecdbf0aaf6a34a2439db8aa7bb63ed0c4aaa5eb8">H5S_SCALAR</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_fspace;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// create an attribute on the root group</span></div>
<div class="line"> <span class="keywordflow">if</span> ((attr = <a class="code hl_function" href="#ga4f4e5248c09f689633079ed8afc0b308">H5Acreate2</a>(file, attr_name, <a class="code hl_define" href="group___p_d_t_s_t_d.html#ga8db8c9c2bcc457f9f8526c8fcb81218b">H5T_STD_I32LE</a>, fspace, acpl, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) ==</div>
<div class="line"> <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_attr;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <a class="code hl_function" href="#gaef4394b661e2c930879e9868e122bdda">H5Aclose</a>(attr);</div>
<div class="line">fail_attr:</div>
<div class="line"> <a class="code hl_function" href="group___h5_s.html#ga2b53128a39c8f104c1c9c2a91590fcc1">H5Sclose</a>(fspace);</div>
<div class="line">fail_fspace:</div>
<div class="line"> <a class="code hl_function" href="group___p_l_c_r.html#ga5dce61149211d3ef319452aa598887fb">H5Pclose</a>(acpl);</div>
<div class="line">fail_acpl:</div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:;</div>
<div class="line"> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a>, <a class="el" href="#ga59863b205b6d93b2145f0fbca49656f7" title="Opens an attribute for an object specified by object identifier and attribute name.">H5Aopen()</a> </dd></dl>
</div>
</div>
<a id="gaa30f5f6c277d6c46f8aa31e89cdba085" name="gaa30f5f6c277d6c46f8aa31e89cdba085"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaa30f5f6c277d6c46f8aa31e89cdba085">◆ </a></span>H5Acreate1()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Acreate1 </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>type_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>space_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>acpl_id</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Creates an attribute attached to a specified object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">name</td><td>Name of attribute to locate and open </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">type_id</td><td>Identifier of attribute datatype </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">space_id</td><td>Dataspace identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">acpl_id</td><td>Attribute creation property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000010">Deprecated</a></b></dt><dd>Superseded by <a class="el" href="#ga4f4e5248c09f689633079ed8afc0b308" title="Creates an attribute attached to a specified object.">H5Acreate2()</a>.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>The <code>acpl</code> parameter is currently not used; specify <a class="el" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>.</dd></dl>
<p><a class="el" href="#gaa30f5f6c277d6c46f8aa31e89cdba085" title="Creates an attribute attached to a specified object.">H5Acreate1()</a> creates an attribute, <code>name</code>, which is attached to the object specified by the identifier <code>loc_id</code>.</p>
<p>The attribute name, <code>name</code>, must be unique for the object.</p>
<p>The attribute is created with the specified datatype and dataspace, <code>type_id</code> and <code>space_id</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0</dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.8.0 The function <a class="el" href="#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a> was renamed to <a class="el" href="#gaa30f5f6c277d6c46f8aa31e89cdba085" title="Creates an attribute attached to a specified object.">H5Acreate1()</a> and deprecated in this release.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> </dd></dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4f4e5248c09f689633079ed8afc0b308">◆ </a></span>H5Acreate2()</h2>
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<tr>
<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Acreate2 </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>type_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>space_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>acpl_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>aapl_id</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Creates an attribute attached to a specified object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Name of attribute </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">type_id</td><td>Attribute datatype identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">space_id</td><td>Dataspace identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">acpl_id</td><td>Attribute creation property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">aapl_id</td><td>Attribute access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#ga4f4e5248c09f689633079ed8afc0b308" title="Creates an attribute attached to a specified object.">H5Acreate2()</a> creates an attribute, <code>attr_name</code>, which is attached to the object specified by the identifier <code>loc_id</code>.</p>
<p>The attribute name, <code>attr_name</code>, must be unique for the object.</p>
<p>The attribute is created with the specified datatype and dataspace, <code>type_id</code> and <code>space_id</code>.</p>
<dl class="section note"><dt>Note</dt><dd>The <code>aapl_id</code> parameter is currently not used; specify <a class="el" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>.</dd></dl>
<p>The attribute identifier returned by this function must be released with <a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> or resource leaks will develop.</p>
<dl class="section note"><dt>Note</dt><dd>If <code>loc_id</code> is a file identifier, the attribute will be attached to that file's root group.</dd></dl>
<dl class="section user"><dt>Example</dt><dd><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_acpl, fail_attr, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file, acpl, fspace, attr;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a5a2d6726f9ad8d2bca8df2b817e5ad6a">H5F_ACC_TRUNC</a>;</div>
<div class="line"> <span class="keywordtype">char</span> file_name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> <span class="comment">// attribute names can be arbitrary Unicode strings</span></div>
<div class="line"> <span class="keywordtype">char</span> attr_name[] = <span class="stringliteral">"Χαρακτηριστικό"</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gae64b51ee9ac0781bc4ccc599d98387f4">H5Fcreate</a>(file_name, mode, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> ((acpl = <a class="code hl_function" href="group___p_l_c_r.html#gaf1b11da01d4d45d788c45f8bc5f0cbfa">H5Pcreate</a>(<a class="code hl_define" href="_h5_ppublic_8h.html#aa0102211c679e031e2e9831b66c48a12">H5P_ATTRIBUTE_CREATE</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_acpl;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// use UTF-8 encoding for the attribute name</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code hl_function" href="group___a_c_p_l.html#gad4fa8e2d17236786f770cf17eef908cc">H5Pset_char_encoding</a>(acpl, <a class="code hl_enumvalue" href="_h5_tpublic_8h.html#a03755b8370672668ddc7063add28e71aa41685667f69bf81eb7de5dd5f452e658">H5T_CSET_UTF8</a>) < 0) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_fspace;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// create a scalar (singleton) attribute</span></div>
<div class="line"> <span class="keywordflow">if</span> ((fspace = <a class="code hl_function" href="group___h5_s.html#gabee514327cba34ca9951b24fa14fb083">H5Screate</a>(<a class="code hl_enumvalue" href="_h5_spublic_8h.html#ae53f3c6a52563646fbac9ead8ecdbf0aaf6a34a2439db8aa7bb63ed0c4aaa5eb8">H5S_SCALAR</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_fspace;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// create an attribute on the root group</span></div>
<div class="line"> <span class="keywordflow">if</span> ((attr = <a class="code hl_function" href="#ga4f4e5248c09f689633079ed8afc0b308">H5Acreate2</a>(file, attr_name, <a class="code hl_define" href="group___p_d_t_s_t_d.html#ga8db8c9c2bcc457f9f8526c8fcb81218b">H5T_STD_I32LE</a>, fspace, acpl, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) ==</div>
<div class="line"> <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_attr;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <a class="code hl_function" href="#gaef4394b661e2c930879e9868e122bdda">H5Aclose</a>(attr);</div>
<div class="line">fail_attr:</div>
<div class="line"> <a class="code hl_function" href="group___h5_s.html#ga2b53128a39c8f104c1c9c2a91590fcc1">H5Sclose</a>(fspace);</div>
<div class="line">fail_fspace:</div>
<div class="line"> <a class="code hl_function" href="group___p_l_c_r.html#ga5dce61149211d3ef319452aa598887fb">H5Pclose</a>(acpl);</div>
<div class="line">fail_acpl:</div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:;</div>
<div class="line"> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.8.0</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> </dd></dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga004160c28e281455ec48aa7fe557ef8a">◆ </a></span>H5Acreate_by_name()</h2>
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<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Acreate_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>type_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>space_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>acpl_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>aapl_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Creates an attribute attached to a specified object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name, relative to <code>loc_id</code>, of object that attribute is to be attached to </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Attribute name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">type_id</td><td>Attribute datatype identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">space_id</td><td>Dataspace identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">acpl_id</td><td>Attribute creation property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">aapl_id</td><td>Attribute access property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#ga004160c28e281455ec48aa7fe557ef8a" title="Creates an attribute attached to a specified object.">H5Acreate_by_name()</a> creates an attribute, <code>attr_name</code>, which is attached to the object specified by <code>loc_id</code> and <code>obj_name</code>.</p>
<p><code>loc_id</code> is a location identifier; <code>obj_name</code> is the object name relative to <code>loc_id</code>.</p>
<p>The attribute name, <code>attr_name</code>, must be unique for the object.</p>
<p>The attribute is created with the specified datatype and dataspace, <code>type_id</code> and <code>space_id</code>.</p>
<dl class="section note"><dt>Note</dt><dd>The <code>aapl_id</code> parameter is currently not used; specify <a class="el" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>.</dd></dl>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gada9fa3d6db52329f1fd55662de6ff6ba">◆ </a></span>H5Adelete()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Adelete </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em></span> )</td>
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<p>Deletes an attribute from a specified location. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Name of the attribute to delete</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gada9fa3d6db52329f1fd55662de6ff6ba" title="Deletes an attribute from a specified location.">H5Adelete()</a> removes the attribute specified by its name, <code>attr_name</code>, from a file, dataset, group, or named datatype.</p>
<dl class="section attention"><dt>Attention</dt><dd>This function should not be used when other attribute identifiers are open on <code>loc_id</code>. This may cause the internal indexes of the attributes to change and future writes to the open attributes to produce incorrect results.</dd></dl>
<dl class="section user"><dt>Example</dt><dd><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_attr, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a402673dec5c537b27a49a9a8bd6140b4">H5F_ACC_RDWR</a>;</div>
<div class="line"> <span class="keywordtype">char</span> file_name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> <span class="keywordtype">char</span> attr_name[] = <span class="stringliteral">"Χαρακτηριστικό"</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gaa3f4f877b9bb591f3880423ed2bf44bc">H5Fopen</a>(file_name, mode, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// delete the attribute</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code hl_function" href="#gada9fa3d6db52329f1fd55662de6ff6ba">H5Adelete</a>(file, attr_name) < 0) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_attr;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line">fail_attr:</div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:;</div>
<div class="line"> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga06711a4e77ff8ab49e427010fd38ac9e">◆ </a></span>H5Adelete_by_idx()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Adelete_by_idx </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a></td> <td class="paramname"><span class="paramname"><em>idx_type</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a></td> <td class="paramname"><span class="paramname"><em>order</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>n</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Deletes an attribute from an object according to index order. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object, relative to location, from which attribute is to be removed </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx_type</td><td>Type of index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">order</td><td>Order in which to iterate over the index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">n</td><td>Offset within the index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga06711a4e77ff8ab49e427010fd38ac9e" title="Deletes an attribute from an object according to index order.">H5Adelete_by_idx()</a> removes an attribute specified by its location in an index, from an object.</p>
<p>The object from which the attribute is to be removed is specified by a location identifier and name, <code>loc_id</code> and <code>obj_name</code>, respectively.</p>
<p>The attribute to be removed is specified by a position in an index, <code>n</code>. The type of index is specified by <code>idx_type</code>. The order in which the index is to be traversed is specified by <code>order</code>. For example, if <code>idx_type</code>, <code>order</code>, and <code>n</code> are set to <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3a644e6701706be4d37660864336c7bd3e">H5_INDEX_NAME</a>, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9a80c3e083c0a77063b1a66553decfcb08">H5_ITER_INC</a>, and 5, respectively, the fifth attribute in the lexicographic order of attribute names will be removed.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gacbf689308f851428dd641b64f5f94feb">◆ </a></span>H5Adelete_by_name()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Adelete_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Removes an attribute from a specified location. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object, relative to location, from which attribute is to be removed </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Name of attribute to delete </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gacbf689308f851428dd641b64f5f94feb" title="Removes an attribute from a specified location.">H5Adelete_by_name()</a> removes the attribute <code>attr_name</code> from an object specified by location and name, <code>loc_id</code> and <code>obj_name</code>, respectively.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga293b5be270d90cd5e47f782ca9aec80b">◆ </a></span>H5Aexists()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#aa8f6c28736dbd0f18388c67911d38aca">htri_t</a> H5Aexists </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>obj_id</em>, </span></td>
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<td class="paramkey"></td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em></span> )</td>
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<p>Determines whether an attribute with a given name exists on an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">obj_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Attribute name</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns zero (false), a positive (true) or a negative (failure) value.</dd></dl>
<p><a class="el" href="#ga293b5be270d90cd5e47f782ca9aec80b" title="Determines whether an attribute with a given name exists on an object.">H5Aexists()</a> determines whether the attribute <code>attr_name</code> exists on the object specified by <code>obj_id</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa1d2305651a4524f6aa0f8b56eec1a37">◆ </a></span>H5Aexists_by_name()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#aa8f6c28736dbd0f18388c67911d38aca">htri_t</a> H5Aexists_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>obj_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Determines whether an attribute with a given name exists on an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">obj_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Object name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Attribute name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns zero (false), a positive (true) or a negative (failure) value.</dd></dl>
<p><a class="el" href="#gaa1d2305651a4524f6aa0f8b56eec1a37" title="Determines whether an attribute with a given name exists on an object.">H5Aexists_by_name()</a> determines whether the attribute <code>attr_name</code> exists on an object. That object is specified by its location and name, <code>loc_id</code> and <code>obj_name</code>, respectively.</p>
<p><code>loc_id</code> specifies a location in the file containing the object. <code>obj_name</code> is the name of the object to which the attribute is attached and can be a relative name, relative to <code>loc_id</code>, or an absolute name, based on the root group of the file.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0f6b545850bd21f128904eff51df226d">◆ </a></span>H5Aget_create_plist()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aget_create_plist </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em></span></td><td>)</td>
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<p>Gets an attribute creation property list identifier. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute's creation property list identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#ga0f6b545850bd21f128904eff51df226d" title="Gets an attribute creation property list identifier.">H5Aget_create_plist()</a> returns an identifier for the attribute creation property list associated with the attribute specified by <code>attr_id</code>.</p>
<p>The creation property list identifier should be released with <a class="el" href="group___p_l_c_r.html#ga5dce61149211d3ef319452aa598887fb" title="Terminates access to a property list.">H5Pclose()</a> to prevent resource leaks.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gae3f1b7b87240b461f7827a8783acc08a">◆ </a></span>H5Aget_info()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aget_info </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_h5_a__info__t.html">H5A_info_t</a> *</td> <td class="paramname"><span class="paramname"><em>ainfo</em></span> )</td>
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<p>Retrieves attribute information by attribute identifier. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">ainfo</td><td>Attribute information struct</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gae3f1b7b87240b461f7827a8783acc08a" title="Retrieves attribute information by attribute identifier.">H5Aget_info()</a> retrieves attribute information, locating the attribute with an attribute identifier, <code>attr_id</code>. The attribute information is returned in the <code>ainfo</code> struct.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gad110910cb227c15fdca938a642714fe9">◆ </a></span>H5Aget_info_by_idx()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aget_info_by_idx </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a></td> <td class="paramname"><span class="paramname"><em>idx_type</em>, </span></td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a></td> <td class="paramname"><span class="paramname"><em>order</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>n</em>, </span></td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="struct_h5_a__info__t.html">H5A_info_t</a> *</td> <td class="paramname"><span class="paramname"><em>ainfo</em>, </span></td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Retrieves attribute information by attribute index position. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object to which attribute is attached, relative to location </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx_type</td><td>Type of index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">order</td><td>Index traversal order </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">n</td><td>Attribute's position in index </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">ainfo</td><td>Struct containing returned attribute information </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gad110910cb227c15fdca938a642714fe9" title="Retrieves attribute information by attribute index position.">H5Aget_info_by_idx()</a> retrieves information for an attribute that is attached to an object, which is specified by its location and name, <code>loc_id</code> and <code>obj_name</code>, respectively. The attribute is located by its index position, and the attribute information is returned in the <code>ainfo</code> struct.</p>
<p>The attribute is located by means of an index type, an index traversal order, and a position in the index, <code>idx_type</code>, <code>order</code> and <code>n</code>, respectively.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga258f03e12b4f49ad33ba72d17a9e2faf">◆ </a></span>H5Aget_info_by_name()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aget_info_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
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<td class="paramtype"><a class="el" href="struct_h5_a__info__t.html">H5A_info_t</a> *</td> <td class="paramname"><span class="paramname"><em>ainfo</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Retrieves attribute information by attribute name. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of the object to which an attribute is attached, relative to location </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Attribute name </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">ainfo</td><td>Struct containing returned attribute information </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga258f03e12b4f49ad33ba72d17a9e2faf" title="Retrieves attribute information by attribute name.">H5Aget_info_by_name()</a> retrieves information for an attribute, <code>attr_name</code>, that is attached to an object specified by its location and name, <code>loc_id</code> and <code>obj_name</code>, respectively. The attribute information is returned in the <code>ainfo</code> struct.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga05e195aabab8c623b1c52009aeb99674">◆ </a></span>H5Aget_name()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#af629ed855824cf5955b54529adf78ad6">ssize_t</a> H5Aget_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em>, </span></td>
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<p>Gets an attribute name. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buf_size</td><td>The size of the buffer to store the name in </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">buf</td><td>Buffer to store name in</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns the length of the attribute's name, which may be longer than <code>buf_size</code>, if successful. Otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga05e195aabab8c623b1c52009aeb99674" title="Gets an attribute name.">H5Aget_name()</a> retrieves the name of an attribute specified by the identifier, <code>attr_id</code>. Up to <code>buf_size</code> characters are stored in <code>buf</code> followed by a \0 string terminator. If the name of the attribute is longer than (<code>buf_size</code> -1), the string terminator is stored in the last position of the buffer to properly terminate the string.</p>
<p>If the user only wants to retrieve the name length, the values 0 and NULL should be passed for the parameters <code>bufsize</code> and <code>buf</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4c552b2db32371f8ea20d87475313fb6">◆ </a></span>H5Aget_name_by_idx()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#af629ed855824cf5955b54529adf78ad6">ssize_t</a> H5Aget_name_by_idx </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a></td> <td class="paramname"><span class="paramname"><em>idx_type</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a></td> <td class="paramname"><span class="paramname"><em>order</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>n</em>, </span></td>
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<td class="paramtype">char *</td> <td class="paramname"><span class="paramname"><em>name</em>, </span></td>
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<td class="paramtype">size_t</td> <td class="paramname"><span class="paramname"><em>size</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Gets an attribute name by attribute index position. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object to which attribute is attached, relative to location </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx_type</td><td>Type of index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">order</td><td>Index traversal order </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">n</td><td>Attribute's position in index </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">name</td><td>Attribute name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">size</td><td>Size, in bytes, of attribute name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns attribute name size, in bytes, if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga4c552b2db32371f8ea20d87475313fb6" title="Gets an attribute name by attribute index position.">H5Aget_name_by_idx()</a> retrieves the name of an attribute that is attached to an object, which is specified by its location and name, <code>loc_id</code> and <code>obj_name</code>, respectively. The attribute is located by its index position, the size of the name is specified in <code>size</code>, and the attribute name is returned in <code>name</code>.</p>
<p>The attribute is located by means of an index type, an index traversal order, and a position in the index, <code>idx_type</code>, <code>order</code> and <code>n</code>, respectively.</p>
<p>If the attribute name's size is unknown, the values 0 and NULL can be passed in for the parameters <code>size</code> and <code>name</code>. The function's return value will provide the correct value for <code>size</code>.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaadd809fc16238754105bbddd20bcdde1">◆ </a></span>H5Aget_num_attrs()</h2>
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<td class="memname">int H5Aget_num_attrs </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em></span></td><td>)</td>
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<p>Determines the number of attributes attached to an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns the number of attributes if successful; otherwise, returns a negative value.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000011">Deprecated</a></b></dt><dd>Superseded by <a class="el" href="group___h5_o.html#gaf4f302a33faba9e1c2b5f64c62ca4ed5">H5Oget_info()</a>, <a class="el" href="group___h5_o.html#ga16d8ac07f9244cfccb42b5f309ca6b3c">H5Oget_info_by_name()</a>, and <a class="el" href="group___h5_o.html#gafe764884e1530f86079288dd5895a7bd">H5Oget_info_by_idx()</a>.</dd></dl>
<p><a class="el" href="#gaadd809fc16238754105bbddd20bcdde1" title="Determines the number of attributes attached to an object.">H5Aget_num_attrs()</a> returns the number of attributes attached to the object specified by its identifier, <code>loc_id</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9e21e544119d03f9342530b45a71d74d">◆ </a></span>H5Aget_space()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aget_space </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em></span></td><td>)</td>
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<p>Gets a copy of the dataspace for an attribute. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute dataspace identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#ga9e21e544119d03f9342530b45a71d74d" title="Gets a copy of the dataspace for an attribute.">H5Aget_space()</a> retrieves a copy of the dataspace for an attribute. The dataspace identifier returned from this function must be released with <a class="el" href="group___h5_s.html#ga2b53128a39c8f104c1c9c2a91590fcc1" title="Releases and terminates access to a dataspace.">H5Sclose()</a> or resource leaks will develop.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gabd11c8e11db0adde706e41a24a832f06">◆ </a></span>H5Aget_storage_size()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> H5Aget_storage_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em></span></td><td>)</td>
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<p>Returns the amount of storage used to store an attribute. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns the amount of storage size allocated for the attribute; otherwise, returns 0 (zero).</dd></dl>
<p><a class="el" href="#gabd11c8e11db0adde706e41a24a832f06" title="Returns the amount of storage used to store an attribute.">H5Aget_storage_size()</a> returns the amount of storage that is required for the specified attribute, <code>attr_id</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0b070b714b2e535df2e1cb3005026a44">◆ </a></span>H5Aget_type()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aget_type </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em></span></td><td>)</td>
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<p>Gets an attribute's datatype. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a datatype identifier if successful; otherwise returns <a class="el" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>.</dd></dl>
<p><a class="el" href="#ga0b070b714b2e535df2e1cb3005026a44" title="Gets an attribute's datatype.">H5Aget_type()</a> retrieves a copy of the attribute's datatype. The datatype is reopened if it is a named type before returning it to the application. The datatypes returned by this function are always read-only.</p>
<p>The datatype identifier returned from this function must be released with <a class="el" href="group___h5_t.html#gafcba4db244f6a4d71e99c6e72b8678f0" title="Releases a datatype.">H5Tclose()</a> or resource leaks will develop.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gabdb2cf7368eec0ad998cbe6a3f61aa41">◆ </a></span>H5Aiterate1()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aiterate1 </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned *</td> <td class="paramname"><span class="paramname"><em>idx</em>, </span></td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="_h5_apublic_8h.html#ae42c937252ed79a1ad4672f04adba750">H5A_operator1_t</a></td> <td class="paramname"><span class="paramname"><em>op</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>op_data</em></span> )</td>
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<p>Calls a user's function for each attribute on an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">idx</td><td>Starting (in) and ending (out) attribute index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">op</td><td>User's function to pass each attribute to </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">op_data</td><td>User's data to pass through to the iterator operator function</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000012">Deprecated</a></b></dt><dd>Superseded by <a class="el" href="#ga9315a22b60468b6e996559b1b8a77251" title="Calls a user-defined function for each attribute on an object.">H5Aiterate2()</a>.</dd></dl>
<p><a class="el" href="#gabdb2cf7368eec0ad998cbe6a3f61aa41" title="Calls a user's function for each attribute on an object.">H5Aiterate1()</a> iterates over the attributes of the object specified by its identifier, <code>loc_id</code>. The object can be a group, dataset, or named datatype. For each attribute of the object, the <code>op_data</code> and some additional information specified below are passed to the operator function <code>op</code>. The iteration begins with the attribute specified by its index, <code>idx</code>; the index for the next attribute to be processed by the operator, <code>op</code>, is returned in <code>idx</code>. If <code>idx</code> is the null pointer, then all attributes are processed.</p>
<dl class="section warning"><dt>Warning</dt><dd>Adding or removing attributes to the object during iteration will lead to undefined behavior.</dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.8.0 The function <code>H5Aiterate</code> was renamed to <a class="el" href="#gabdb2cf7368eec0ad998cbe6a3f61aa41" title="Calls a user's function for each attribute on an object.">H5Aiterate1()</a> and deprecated in this release. </dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9315a22b60468b6e996559b1b8a77251">◆ </a></span>H5Aiterate2()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aiterate2 </td>
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<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a></td> <td class="paramname"><span class="paramname"><em>idx_type</em>, </span></td>
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<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a></td> <td class="paramname"><span class="paramname"><em>order</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *</td> <td class="paramname"><span class="paramname"><em>idx</em>, </span></td>
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<td class="paramtype"><a class="el" href="_h5_apublic_8h.html#a28fef0ded9a6c0eb12334c0d15dc3e74">H5A_operator2_t</a></td> <td class="paramname"><span class="paramname"><em>op</em>, </span></td>
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<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>op_data</em></span> )</td>
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<p>Calls a user-defined function for each attribute on an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx_type</td><td>Type of index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">order</td><td>Order in which to iterate over index </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">idx</td><td>Initial and returned offset within index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">op</td><td>User-defined function to pass each attribute to </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">op_data</td><td>User data to pass through to and to be returned by iterator operator function</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value. Further note that this function returns the return value of the last operator if it was non-zero, which can be a negative value, zero if all attributes were processed, or a positive value indicating short-circuit success.</dd></dl>
<p><a class="el" href="#ga9315a22b60468b6e996559b1b8a77251" title="Calls a user-defined function for each attribute on an object.">H5Aiterate2()</a> iterates over the attributes attached to a dataset, named datatype, or group, as specified by <code>loc_id</code>. For each attribute, user-provided data, <code>op_data</code>, with additional information, as defined below, is passed to a user-defined function, <code>op</code>, which operates on that attribute.</p>
<p>The order of the iteration and the attributes iterated over are specified by three parameters: the index type, <code>idx_type</code>; the order in which the index is to be traversed, <code>order</code>; and the attribute's position in the index, <code>idx</code>. The next attribute to be operated on is specified by <code>idx</code>, a position in the index.</p>
<p>For example, if <code>idx_type</code>, <code>order</code>, and <code>idx</code> are set to <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3a644e6701706be4d37660864336c7bd3e">H5_INDEX_NAME</a>, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9a80c3e083c0a77063b1a66553decfcb08">H5_ITER_INC</a>, and 5, respectively, the attribute in question is the fifth attribute from the beginning of the alphanumeric index of attribute names. If <code>order</code> were set to <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9a2f123d7a4d68054e8aa2d0f1d0a3fcd2">H5_ITER_DEC</a>, it would be the fifth attribute from the end of the index.</p>
<p>The parameter <code>idx</code> is passed in on an <a class="el" href="#ga9315a22b60468b6e996559b1b8a77251" title="Calls a user-defined function for each attribute on an object.">H5Aiterate2()</a> call with one value and may be returned with another value. The value passed in identifies the parameter to be operated on first; the value returned identifies the parameter to be operated on in the next step of the iteration.</p>
<dl class="section note"><dt>Note</dt><dd>This function is also available through the <a class="el" href="#gab9dcfc543cd4282f32b8ea19e08ffa6c">H5Aiterate()</a> macro.</dd></dl>
<dl class="section warning"><dt>Warning</dt><dd>Adding or removing attributes to the object during iteration will lead to undefined behavior.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga75db973d69b61f673f5cdf21ac624cef">◆ </a></span>H5Aiterate_by_name()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aiterate_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
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<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a></td> <td class="paramname"><span class="paramname"><em>idx_type</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a></td> <td class="paramname"><span class="paramname"><em>order</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *</td> <td class="paramname"><span class="paramname"><em>idx</em>, </span></td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_apublic_8h.html#a28fef0ded9a6c0eb12334c0d15dc3e74">H5A_operator2_t</a></td> <td class="paramname"><span class="paramname"><em>op</em>, </span></td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>op_data</em>, </span></td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<p>Calls user-defined function for each attribute on an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object, relative to location </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx_type</td><td>Type of index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">order</td><td>Order in which to iterate over index </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">idx</td><td>Initial and returned offset within index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">op</td><td>User-defined function to pass each attribute to </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">op_data</td><td>User data to pass through to and to be returned by iterator operator function </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value. Further note that this function returns the return value of the last operator if it is non-zero, which can be a negative value, zero if all attributes were processed, or a positive value indicating short-circuit success.</dd></dl>
<p><a class="el" href="#ga75db973d69b61f673f5cdf21ac624cef" title="Calls user-defined function for each attribute on an object.">H5Aiterate_by_name()</a> iterates over the attributes attached to the dataset or group specified with <code>loc_id</code> and <code>obj_name</code>. For each attribute, user-provided data, <code>op_data</code>, with additional information, as defined below, is passed to a user-defined function, <code>op</code>, which operates on that attribute.</p>
<p>The order of the iteration and the attributes iterated over are specified by three parameters: the index type, <code>idx_type</code>; the order in which the index is to be traversed, <code>order</code>; and the attribute's position in the index, <code>idx</code>. The next attribute to be operated on is specified by <code>idx</code>, a position in the index.</p>
<p>For example, if <code>idx_type</code>, <code>order</code>, and <code>idx</code> are set to <a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3a644e6701706be4d37660864336c7bd3e">H5_INDEX_NAME</a>, <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9a80c3e083c0a77063b1a66553decfcb08">H5_ITER_INC</a>, and 5, respectively, the attribute in question is the fifth attribute from the beginning of the alphanumeric index of attribute names. If <code>order</code> were set to <a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9a2f123d7a4d68054e8aa2d0f1d0a3fcd2">H5_ITER_DEC</a>, it would be the fifth attribute from the end of the index.</p>
<p>The parameter <code>idx</code> is passed in on an <a class="el" href="#ga75db973d69b61f673f5cdf21ac624cef" title="Calls user-defined function for each attribute on an object.">H5Aiterate_by_name()</a> call with one value and may be returned with another value. The value passed in identifies the parameter to be operated on first; the value returned identifies the parameter to be operated on in the next step of the iteration.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section warning"><dt>Warning</dt><dd>Adding or removing attributes to the object during iteration will lead to undefined behavior.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga59863b205b6d93b2145f0fbca49656f7">◆ </a></span>H5Aopen()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aopen </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>obj_id</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>aapl_id</em></span> )</td>
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<p>Opens an attribute for an object specified by object identifier and attribute name. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">obj_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Name of attribute to open </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">aapl_id</td><td>Attribute access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#ga59863b205b6d93b2145f0fbca49656f7" title="Opens an attribute for an object specified by object identifier and attribute name.">H5Aopen()</a> opens an existing attribute, <code>attr_name</code>, that is attached to the object specified by an object identifier, <code>obj_id</code>.</p>
<dl class="section note"><dt>Note</dt><dd>The <code>aapl_id</code> parameter is currently not used; specify <a class="el" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>.</dd></dl>
<p>This function, <a class="el" href="#gab1451cdff4f77dcf9feaee83c8179b2d" title="Opens the nth attribute attached to an object.">H5Aopen_by_idx()</a> or <a class="el" href="#gadb49a0b5b9798d2e944d877adba8ae10" title="Opens an attribute for an object by object name and attribute name.">H5Aopen_by_name()</a> must be called before the attribute can be accessed for any further purpose, including reading, writing, or any modification.</p>
<p>The attribute identifier returned by this function must be released with <a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> or resource leaks will develop.</p>
<dl class="section user"><dt>Example</dt><dd><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_attr, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file, attr;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a1c406ffa89f4acf5a332144a2683d394">H5F_ACC_RDONLY</a>;</div>
<div class="line"> <span class="keywordtype">char</span> file_name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> <span class="keywordtype">char</span> attr_name[] = <span class="stringliteral">"Χαρακτηριστικό"</span>;</div>
<div class="line"> <span class="keywordtype">int</span> value;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gaa3f4f877b9bb591f3880423ed2bf44bc">H5Fopen</a>(file_name, mode, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> ((attr = <a class="code hl_function" href="#ga59863b205b6d93b2145f0fbca49656f7">H5Aopen</a>(file, attr_name, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_attr;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// read the attribute value</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code hl_function" href="#gaacb27a997f7c98e8a833d0fd63b58f1c">H5Aread</a>(attr, <a class="code hl_define" href="group___p_d_t_n_a_t.html#ga3cf93ffc6782be68070ef8e00f219ec2">H5T_NATIVE_INT</a>, &value) < 0)</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// do something w/ the attribute value</span></div>
<div class="line"> </div>
<div class="line"> <a class="code hl_function" href="#gaef4394b661e2c930879e9868e122bdda">H5Aclose</a>(attr);</div>
<div class="line">fail_attr:</div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:;</div>
<div class="line"> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.8.0</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a>, <a class="el" href="#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a> </dd></dl>
</div>
</div>
<a id="gab1451cdff4f77dcf9feaee83c8179b2d" name="gab1451cdff4f77dcf9feaee83c8179b2d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab1451cdff4f77dcf9feaee83c8179b2d">◆ </a></span>H5Aopen_by_idx()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aopen_by_idx </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a8203c78e10ab2d89d8bce688a31afad3">H5_index_t</a></td> <td class="paramname"><span class="paramname"><em>idx_type</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a6a6ddd1504d1ed61939d46d91d9441b9">H5_iter_order_t</a></td> <td class="paramname"><span class="paramname"><em>order</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>n</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>aapl_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Opens the nth attribute attached to an object. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object to which attribute is attached, relative to location </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx_type</td><td>Type of index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">order</td><td>Index traversal order </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">n</td><td>Attribute's position in index </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">aapl_id</td><td>Attribute access property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#gab1451cdff4f77dcf9feaee83c8179b2d" title="Opens the nth attribute attached to an object.">H5Aopen_by_idx()</a> opens an existing attribute that is attached to an object specified by location and name, <code>loc_id</code> and <code>obj_name</code>, respectively.</p>
<p>The attribute is identified by an index type, an index traversal order, and a position in the index, <code>idx_type</code>, <code>order</code> and <code>n</code>, respectively.</p>
<dl class="section note"><dt>Note</dt><dd>The <code>aapl_id</code> parameter is currently not used; specify <a class="el" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>.</dd></dl>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<p>This function, <a class="el" href="#ga59863b205b6d93b2145f0fbca49656f7" title="Opens an attribute for an object specified by object identifier and attribute name.">H5Aopen()</a>, or <a class="el" href="#gadb49a0b5b9798d2e944d877adba8ae10" title="Opens an attribute for an object by object name and attribute name.">H5Aopen_by_name()</a> must be called before an attribute can be accessed for any further purpose, including reading, writing, or any modification.</p>
<p>The attribute identifier returned by this function must be released with <a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> or resource leaks will develop.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gadb49a0b5b9798d2e944d877adba8ae10">◆ </a></span>H5Aopen_by_name()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aopen_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>attr_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>aapl_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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</div><div class="memdoc">
<p>Opens an attribute for an object by object name and attribute name. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object to which attribute is attached, relative to <code>loc_id</code> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">attr_name</td><td>Name of attribute to open </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">aapl_id</td><td>Attribute access property list identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<p><a class="el" href="#gadb49a0b5b9798d2e944d877adba8ae10" title="Opens an attribute for an object by object name and attribute name.">H5Aopen_by_name()</a> opens an existing attribute, <code>attr_name</code>, that is attached to an object specified by location and name, <code>loc_id</code> and <code>obj_name</code>, respectively.</p>
<p><code>loc_id</code> specifies a location from which the target object can be located and <code>obj_name</code> is an object name relative to <code>loc_id</code>.</p>
<dl class="section note"><dt>Note</dt><dd>The <code>aapl_id</code> parameter is currently not used; specify <a class="el" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>.</dd></dl>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<p>This function, <a class="el" href="#ga59863b205b6d93b2145f0fbca49656f7" title="Opens an attribute for an object specified by object identifier and attribute name.">H5Aopen()</a>, or <a class="el" href="#gab1451cdff4f77dcf9feaee83c8179b2d" title="Opens the nth attribute attached to an object.">H5Aopen_by_idx()</a> must be called before an attribute can be accessed for any further purpose, including reading, writing, or any modification.</p>
<p>The attribute identifier returned by this function must be released with <a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> or resource leaks will develop.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gadaa85276f2731ad78462a6fd27118470">◆ </a></span>H5Aopen_idx()</h2>
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<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aopen_idx </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned</td> <td class="paramname"><span class="paramname"><em>idx</em></span> )</td>
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<p>Opens the attribute specified by its index. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">idx</td><td>Index of the attribute to open</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000013">Deprecated</a></b></dt><dd>Superseded by <a class="el" href="#gab1451cdff4f77dcf9feaee83c8179b2d" title="Opens the nth attribute attached to an object.">H5Aopen_by_idx()</a>.</dd></dl>
<p><a class="el" href="#gadaa85276f2731ad78462a6fd27118470" title="Opens the attribute specified by its index.">H5Aopen_idx()</a> opens an attribute that is attached to the object specified with <code>loc_id</code>. The location object may be either a group, dataset, or named datatype, all of which may have any sort of attribute. The attribute specified by the index, <code>idx</code>, indicates the attribute to access. The value of <code>idx</code> is a 0-based, non-negative integer. The attribute identifier returned from this function must be released with <a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> or resource leaks will develop.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5c05fade96b6b7e2299f56a5b1edb1c1">◆ </a></span>H5Aopen_name()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Aopen_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>name</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Opens an attribute specified by name. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">name</td><td>Attribute name</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an attribute identifier if successful; otherwise returns a negative value.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000014">Deprecated</a></b></dt><dd>Superseded by <a class="el" href="#gadb49a0b5b9798d2e944d877adba8ae10" title="Opens an attribute for an object by object name and attribute name.">H5Aopen_by_name()</a>.</dd></dl>
<p><a class="el" href="#ga5c05fade96b6b7e2299f56a5b1edb1c1" title="Opens an attribute specified by name.">H5Aopen_name()</a> opens an attribute specified by its name, <code>name</code>, which is attached to the object specified with <code>loc_id</code>. The location object may be either a group, dataset, or named datatype, which may have any sort of attribute. The attribute identifier returned from this function must be released with <a class="el" href="#gaef4394b661e2c930879e9868e122bdda" title="Closes the specified attribute.">H5Aclose()</a> or resource leaks will develop.</p>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
</div>
</div>
<a id="gaacb27a997f7c98e8a833d0fd63b58f1c" name="gaacb27a997f7c98e8a833d0fd63b58f1c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaacb27a997f7c98e8a833d0fd63b58f1c">◆ </a></span>H5Aread()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Aread </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>type_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>buf</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Reads the value of an attribute. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">type_id</td><td>Datatype (in-memory) identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">buf</td><td>Buffer for data to be read</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gaacb27a997f7c98e8a833d0fd63b58f1c" title="Reads the value of an attribute.">H5Aread()</a> reads an attribute, specified with <code>attr_id</code>. The attribute's in-memory datatype is specified with <code>type_id</code>. The entire attribute is read into <code>buf</code> from the file.</p>
<p>Datatype conversion takes place at the time of a read or write and is automatic.</p>
<dl class="section user"><dt>Example</dt><dd><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_attr, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file, attr;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a1c406ffa89f4acf5a332144a2683d394">H5F_ACC_RDONLY</a>;</div>
<div class="line"> <span class="keywordtype">char</span> file_name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> <span class="keywordtype">char</span> attr_name[] = <span class="stringliteral">"Χαρακτηριστικό"</span>;</div>
<div class="line"> <span class="keywordtype">int</span> value;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gaa3f4f877b9bb591f3880423ed2bf44bc">H5Fopen</a>(file_name, mode, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> ((attr = <a class="code hl_function" href="#ga59863b205b6d93b2145f0fbca49656f7">H5Aopen</a>(file, attr_name, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_attr;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// read the attribute value</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code hl_function" href="#gaacb27a997f7c98e8a833d0fd63b58f1c">H5Aread</a>(attr, <a class="code hl_define" href="group___p_d_t_n_a_t.html#ga3cf93ffc6782be68070ef8e00f219ec2">H5T_NATIVE_INT</a>, &value) < 0)</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// do something w/ the attribute value</span></div>
<div class="line"> </div>
<div class="line"> <a class="code hl_function" href="#gaef4394b661e2c930879e9868e122bdda">H5Aclose</a>(attr);</div>
<div class="line">fail_attr:</div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:;</div>
<div class="line"> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.8.8 Fortran updated to Fortran2003. </dd>
<dd>
1.4.2 The <code>dims</code> parameter was added to the Fortran API in this release. </dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#gab70871e205d57450c83efd9912be2b5c" title="Writes data to an attribute.">H5Awrite()</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga490dcd6db246c1fda7295badfce28203">◆ </a></span>H5Arename()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Arename </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>old_name</em>, </span></td>
</tr>
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<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>new_name</em></span> )</td>
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<p>Renames an attribute. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">old_name</td><td>Name of the attribute to be changed </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">new_name</td><td>New name for the attribute</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#ga490dcd6db246c1fda7295badfce28203" title="Renames an attribute.">H5Arename()</a> changes the name of the attribute located at <code>loc_id</code>.</p>
<p>The old name, <code>old_name</code>, is changed to the new name, <code>new_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.6.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga21f8483c935d72187b98f5e7c2056140">◆ </a></span>H5Arename_by_name()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Arename_by_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>obj_name</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>old_attr_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>new_attr_name</em>, </span></td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>lapl_id</em></span> )</td>
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<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file, group, dataset, or named datatype. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">obj_name</td><td>Name of object, relative to location, whose attribute is to be renamed </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">old_attr_name</td><td>Prior attribute name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">new_attr_name</td><td>New attribute name </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">lapl_id</td><td>Link access property list identifier</td></tr>
</table>
</dd>
</dl>
<p><a class="el" href="#ga21f8483c935d72187b98f5e7c2056140">H5Arename_by_name()</a> changes the name of attribute that is attached to the object specified by <code>loc_id</code> and <code>obj_name</code>. The attribute named <code>old_attr_name</code> is renamed <code>new_attr_name</code>.</p>
<p>The link access property list, <code>lapl_id</code>, may provide information regarding the properties of links required to access the object, <code>obj_name</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab70871e205d57450c83efd9912be2b5c">◆ </a></span>H5Awrite()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Awrite </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>attr_id</em>, </span></td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>type_id</em>, </span></td>
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<td class="paramkey"></td>
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<td class="paramtype">const void *</td> <td class="paramname"><span class="paramname"><em>buf</em></span> )</td>
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<p>Writes data to an attribute. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">attr_id</td><td>Attribute identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">type_id</td><td>Datatype (in-memory) identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">buf</td><td>Data to be written</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="#gab70871e205d57450c83efd9912be2b5c" title="Writes data to an attribute.">H5Awrite()</a> writes an attribute, specified with <code>attr_id</code>. The attribute's in-memory datatype is specified with <code>type_id</code>. The entire attribute is written from <code>buf</code> to the file.</p>
<p>Datatype conversion takes place at the time of a read or write and is automatic.</p>
<dl class="section user"><dt>Example</dt><dd><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_attr, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file, attr;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a402673dec5c537b27a49a9a8bd6140b4">H5F_ACC_RDWR</a>;</div>
<div class="line"> <span class="keywordtype">char</span> file_name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> <span class="keywordtype">char</span> attr_name[] = <span class="stringliteral">"Χαρακτηριστικό"</span>;</div>
<div class="line"> <span class="keywordtype">int</span> value = 1234;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gaa3f4f877b9bb591f3880423ed2bf44bc">H5Fopen</a>(file_name, mode, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> ((attr = <a class="code hl_function" href="#ga59863b205b6d93b2145f0fbca49656f7">H5Aopen</a>(file, attr_name, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_attr;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">// update the attribute value</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code hl_function" href="#gab70871e205d57450c83efd9912be2b5c">H5Awrite</a>(attr, <a class="code hl_define" href="group___p_d_t_n_a_t.html#ga3cf93ffc6782be68070ef8e00f219ec2">H5T_NATIVE_INT</a>, &value) < 0)</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> </div>
<div class="line"> <a class="code hl_function" href="#gaef4394b661e2c930879e9868e122bdda">H5Aclose</a>(attr);</div>
<div class="line">fail_attr:</div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:;</div>
<div class="line"> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.8.8 Fortran updated to Fortran2003. </dd>
<dd>
1.4.2 Fortran <code>dims</code> parameter added in this release </dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.0.0 </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#gaacb27a997f7c98e8a833d0fd63b58f1c" title="Reads the value of an attribute.">H5Aread()</a> </dd></dl>
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