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-<head><title>
-HDF5/H5R API Specification
-</title>
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-<!--
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-<a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;&nbsp;
-<br>
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-</td></tr>
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-<hr><!-- #EndLibraryItem --><center>
-<h1>H5R: Reference Interface</h1>
-</center>
-
-<h2>Reference API Functions</h2>
-
-The Reference interface allows the user to create references
-to specific objects and data regions in an HDF5 file.
-
-<p>
-<strong>The C Interfaces:</strong>
-
-<table border=0 width=80%>
-<tr><td valign=top width=40%>
-<ul>
- <li><a href="#Reference-Create">H5Rcreate</a>
- <li><a href="#Reference-Dereference">H5Rdereference</a>
-</ul>
-</td><td valign=top width=40%>
-<ul>
- <li><a href="#Reference-GetRegion">H5Rget_region</a>
- <li><a href="#Reference-GetObjType">H5Rget_obj_type</a>
-</ul>
-</td><td valign=top width=20%>
-<ul>
- &nbsp;
-</ul>
-</td></tr>
-</table>
-
-<p>
-
-<i>Alphabetical Listing</i>
-
-<table border="0">
- <tr>
- <td valign="top">
- <ul>
- <li><a href="#Reference-Create">H5Rcreate</a>
- <li><a href="#Reference-Dereference">H5Rdereference</a>
- </ul>
- </td>
-
- <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
-
- <td valign="top">
- <ul>
- <li><a href="#Reference-GetObjType">H5Rget_obj_type</a>
- </ul>
- </td>
-
- <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
-
- <td valign="top">
- <ul>
- <li><a href="#Reference-GetRegion">H5Rget_region</a>
- </ul>
- </td>
- </tr>
-</table>
-
-<br>
-<strong>The FORTRAN90 Interfaces:</strong>
-<br>
-In general, each FORTRAN90 subroutine performs exactly the same task
-as the corresponding C function.
-<br>
-
-<table border=0 width=80%>
-<tr><td valign=top width=40%>
-<ul>
- <li><a href="#Reference-Create">h5rcreate_f</a>
- <li><a href="#Reference-Dereference">h5rdereference_f</a>
-</ul>
-</td><td valign=top width=40%>
-<ul>
- <li><a href="#Reference-GetRegion">h5rget_region_f</a>
- <li><a href="#Reference-GetObjType">h5rget_object_type_f</a>
-</ul>
-</td><td valign=top width=20%>
-<ul>
-
-</ul>
-</td></tr>
-</table>
-
-
-<p>
-
-<!-- NEW PAGE -->
-<!-- HEADER RIGHT " " -->
-<!-- NEW PAGE -->
-<!-- HEADER RIGHT "H5Rcreate" -->
-<hr>
-<dl>
-<dt><strong>Name:</strong> <a name="Reference-Create">H5Rcreate</a>
-<dt><strong>Signature:</strong>
- <dd><em>herr_t</em> <code>H5Rcreate</code>(<em>void *</em><code>ref</code>,
- <em>hid_t</em> <code>loc_id</code>,
- <em>const char *</em><code>name</code>,
- <em>H5R_type_t</em> <code>ref_type</code>,
- <em>hid_t</em> <code>space_id</code>
- )
-<dt><strong>Purpose:</strong>
- <dd>Creates a reference.
-<dt><strong>Description:</strong>
- <dd><code>H5Rcreate</code> creates the reference, <code>ref</code>,
- of the type specified in <code>ref_type</code>, pointing to
- the object <code>name</code> located at <code>loc_id</code>.
- <p>
- The HDF5 library maps the <em>void</em> type specified above
- for <code>ref</code> to the type specified in <code>ref_type</code>,
- which will be one of those appearing in the first column of
- the following table.
- The second column of the table lists the HDF5 constant associated
- with each reference type.
- <dir>
- <table border=0>
- <tr><td><em>hdset_reg_ref_t</em>&nbsp;&nbsp;</td>
- <td><code>H5R_DATASET_REGION</code>&nbsp;&nbsp;</td>
- <td>Dataset region reference</td></tr>
- <tr><td><em>hobj_ref_t</em></td>
- <td><code>H5R_OBJECT</code></td>
- <td>Object reference</td></tr>
- </table>
- </dir>
- <p>
- The parameters <code>loc_id</code> and <code>name</code> are
- used to locate the object.
- <p>
- The parameter <code>space_id</code> identifies the region
- to be pointed to for a dataset region reference.
- This parameter is unused with object references.
-<dt><strong>Parameters:</strong>
- <ul><table>
- <tr>
- <td valign="top"><em>void *</em><code>ref</code></td>
- <td valign="top">OUT: Reference created by the function call.</td></tr>
- <tr>
- <td valign="top"><em>hid_t</em> <code>loc_id</code></td>
- <td valign="top">IN: Location identifier used to locate the object being
- pointed to.</td></tr>
- <tr>
- <td valign="top"><em>const char *</em><code>name</code></td>
- <td valign="top">IN: Name of object at location <code>loc_id</code>.</td></tr>
- <tr>
- <td valign="top"><em>H5R_type_t</em>&nbsp;<code>ref_type&nbsp;&nbsp;&nbsp;&nbsp;</code></td>
- <td valign="top">IN: Type of reference.</td></tr>
- <tr>
- <td valign="top"><em>hid_t</em> <code>space_id</code></td>
- <td valign="top">IN: Dataspace identifier with selection.
- Used for dataset region references.</td></tr>
- </table></ul>
-<dt><strong>Returns:</strong>
- <dd>Returns a non-negative value if successful;
- otherwise returns a negative value.
-<dt><strong>Fortran90 Interface:</strong> h5rcreate_f
-
- <p><strong>To create an object reference</strong>
- <dd>
- <pre>
-SUBROUTINE h5rcreate_f(loc_id, name, ref, hdferr)
- IMPLICIT NONE
- INTEGER(HID_T), INTENT(IN) :: loc_id ! Location identifier
- CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the object at location
- ! specified by loc_id identifier
- TYPE(hobj_ref_t_f), INTENT(OUT) :: ref ! Object reference
- INTEGER, INTENT(OUT) :: hdferr ! Error code
-
-END SUBROUTINE h5rcreate_f
- </pre></dt>
-
-<!-- NEW PAGE -->
-<dt><strong>To create a region reference</strong>
- <dd>
- <pre>
-SUBROUTINE h5rcreate_f(loc_id, name, space_id, ref, hdferr)
- IMPLICIT NONE
- INTEGER(HID_T), INTENT(IN) :: loc_id ! Location identifier
- CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the dataset at location
- ! specified by loc_id identifier
- INTEGER(HID_T), INTENT(IN) :: space_id ! Dataset's dataspace identifier
- TYPE(hdset_reg_ref_t_f), INTENT(OUT) :: ref ! Dataset region reference
- INTEGER, INTENT(OUT) :: hdferr ! Error code
-
-END SUBROUTINE h5rcreate_f
- </pre>
-
- <!--<dt><strong>Non-C API(s):</strong>
- <dd>
-
- <img src="Graphics/Java.gif">
- <img src="Graphics/C++.gif">
- -->
-</dl>
-
-<!-- NEW PAGE -->
-<!-- HEADER RIGHT "H5Rdereference" -->
-<hr>
-<dl>
-<dt><strong>Name:</strong> <a name="Reference-Dereference">H5Rdereference</a>
-<dt><strong>Signature:</strong>
- <dd><em>hid_t</em> <code>H5Rdereference</code>(<em>hid_t</em> <code>dataset</code>,
- <em>H5R_type_t</em> <code>ref_type</code>,
- <em>void *</em><code>ref</code>
- )
-<dt><strong>Purpose:</strong>
- <dd>Opens the HDF5 object referenced.
-<dt><strong>Description:</strong>
- <dd>Given a reference to some object, <code>H5Rdereference</code>
- opens that object and returns an identifier.
- <p>
- The parameter <code>ref_type</code> specifies the reference type
- of <code>ref</code>.
- <code>ref_type</code> may contain either of the following values:
- <ul>
- <li><code>H5R_OBJECT</code> (<code>0</code>)
- <li><code>H5R_DATASET_REGION</code> (<code>1</code>)
- </ul>
-<dt><strong>Parameters:</strong>
- <ul><table>
- <tr>
- <td valign="top"><em>hid_t</em> <code>dataset</code></td>
- <td valign="top">IN: Dataset containing reference object.</td></tr>
- <tr>
- <td valign="top"><em>H5R_type_t</em>&nbsp;<code>ref_type&nbsp;&nbsp;&nbsp;&nbsp;</code></td>
- <td valign="top">IN: The reference type of <code>ref</code>.</td></tr>
- <tr>
- <td valign="top"><em>void *</em><code>ref</code></td>
- <td valign="top">IN: Reference to open.</td></tr>
- </table></ul>
-<dt><strong>Returns:</strong>
- <dd>Returns valid identifier if successful;
- otherwise returns a negative value.
-<dt><strong>Fortran90 Interface:</strong> h5rdereference_f
-
- <p><strong>To dereference an object</strong>
- <dd>
- <pre>
-SUBROUTINE h5rdereference_f(dset_id, ref, obj_id, hdferr)
- IMPLICIT NONE
- INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
- TYPE(hobj_ref_t_f), INTENT(IN) :: ref ! Object reference
- INTEGER(HID_T), INTENT(OUT) :: obj_id ! Object identifier
- INTEGER, INTENT(OUT) :: hdferr ! Error code
-
-END SUBROUTINE h5rdereference_f
- </pre>
-</dt>
-
-<dt><strong>To dereference a region</strong>
- <dd>
- <pre>
-SUBROUTINE h5rdereference_f(dset_id, ref, obj_id, hdferr)
- IMPLICIT NONE
- INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
- TYPE(hdset_reg_ref_t_f), INTENT(IN) :: ref ! Object reference
- INTEGER(HID_T), INTENT(OUT) :: obj_id ! Object identifier
- INTEGER, INTENT(OUT) :: hdferr ! Error code
-
-END SUBROUTINE h5rdereference_f
- </pre>
-
- <!--<dt><strong>Non-C API(s):</strong>
- <dd>
-
- <img src="Graphics/Java.gif">
- <img src="Graphics/C++.gif">
- -->
-</dl>
-
-<!-- NEW PAGE -->
-<!-- HEADER RIGHT "H5Rget_obj_type" -->
-<hr>
-<dl>
-<dt><strong>Name:</strong> <a name="Reference-GetObjType">H5Rget_obj_type</a>
-<dt><strong>Signature:</strong>
- <dd><em>H5G_obj_t</em> <code>H5Rget_obj_type</code>(<em>hid_t</em> <code>id</code>,
- <em>H5R_type_t</em> <code>ref_type</code>,
- <em>void *</em><code>ref</code>
- )
-<dt><strong>Purpose:</strong>
- <dd>Retrieves the type of object that an object reference points to.
-<dt><strong>Description:</strong>
- <dd>Given type of object reference, <code>ref_type</code>,
- and a reference to an object, <code>ref</code>,
- <code>H5Rget_obj_type</code>
- returns the type of the referenced object.
- <p>
- Valid object reference types, to pass in as <code>ref_type</code>,
- include the following:
- <table border="0">
- <tr align=left valign=top><td>&nbsp;&nbsp;&nbsp;&nbsp;</td><td>
- <code>H5R_OBJECT</code></td><td>
- Reference is an object reference.
- </td></tr>
- <tr align=left valign=top><td>&nbsp;</td><td>
- <code>H5R_DATASET_REGION&nbsp;&nbsp;</code></td><td>
- Reference is a dataset region reference.
- </td></tr>
- </table>
- <p>
- Valid object type return values include the following:
- <table border="0">
- <tr align=left valign=top><td>&nbsp;&nbsp;&nbsp;&nbsp;</td><td>
- <code>H5G_LINK</code></td><td>
- Object is a symbolic link.
- </td></tr>
- <tr align=left valign=top><td>&nbsp;</td><td>
- <code>H5G_GROUP</code></td><td>
- Object is a group.
- </td></tr>
- <tr align=left valign=top><td>&nbsp;</td><td>
- <code>H5G_DATASET&nbsp;&nbsp;</code></td><td>
- Object is a dataset.
- </td></tr>
- <tr align=left valign=top><td>&nbsp;</td><td>
- <code>H5G_TYPE</code></td><td>
- Object is a named datatype.
- </td></tr>
- </table>
-<dt><strong>Parameters:</strong>
- <ul><table>
- <tr>
- <td valign="top"><em>hid_t</em> <code>id</code>,</td>
- <td valign="top">IN: The dataset containing the reference object or
- the location identifier of the object that the
- dataset is located within.</td></tr>
- <tr>
- <td valign="top"><em>H5R_type_t</em>&nbsp;<code>ref_type&nbsp;&nbsp;&nbsp;&nbsp;</code></td>
- <td valign="top">IN: Type of reference to query.</td></tr>
- <tr>
- <td valign="top"><em>void *</em><code>ref</code></td>
- <td valign="top">IN: Reference to query.</td></tr>
- </table></ul>
-<dt><strong>Returns:</strong>
- <dd>Returns an object type as defined in <code>H5Gpublic.h</code> if successful;
- otherwise returns <code>H5G_UNKNOWN</code>.
-<dt><strong>Fortran90 Interface:</strong> h5rget_object_type_f
- <dd>
- <pre>
-SUBROUTINE h5rget_object_type_f(dset_id, ref, obj_type, hdferr)
- IMPLICIT NONE
- INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
- TYPE(hobj_ref_t_f), INTENT(IN) :: ref ! Object reference
- INTEGER, INTENT(OUT) :: obj_type ! Object type
- ! H5G_UNKNOWN_F (-1)
- ! H5G_LINK_F 0
- ! H5G_GROUP_F 1
- ! H5G_DATASET_F 2
- ! H5G_TYPE_F 3
- INTEGER, INTENT(OUT) :: hdferr ! Error code
-
-END SUBROUTINE h5rget_object_type_f
- </pre>
-
- <!--<dt><strong>Non-C API(s):</strong>
- <dd>
-
- <img src="Graphics/Java.gif">
- <img src="Graphics/C++.gif">
- -->
-</dl>
-
-
-<!-- NEW PAGE -->
-<!-- HEADER RIGHT "H5Rget_region" -->
-<hr>
-<dl>
-<dt><strong>Name:</strong> <a name="Reference-GetRegion">H5Rget_region</a>
-<dt><strong>Signature:</strong>
- <dd><em>hid_t</em> <code>H5Rget_region</code>(<em>hid_t</em> <code>dataset</code>,
- <em>H5R_type_t</em> <code>ref_type</code>,
- <em>void *</em><code>ref</code>
- )
-<dt><strong>Purpose:</strong>
- <dd>Retrieves a dataspace with the specified region selected.
-<dt><strong>Description:</strong>
- <dd>Given a reference to an object <code>ref</code>,
- <code>H5Rget_region</code> creates a copy of the dataspace
- of the dataset pointed to and defines a selection in the copy
- which is the region pointed to.
- <p>
- The parameter <code>ref_type</code> specifies the reference type
- of <code>ref</code>.
- <code>ref_type</code> may contain the following value:
- <ul>
- <li><code>H5R_DATASET_REGION</code> (<code>1</code>)
- </ul>
-<dt><strong>Parameters:</strong>
- <ul><table>
- <tr>
- <td valign="top"><em>hid_t</em> <code>dataset</code></td>
- <td valign="top">IN: Dataset containing reference object.</td></tr>
- <tr>
- <td valign="top"><em>H5R_type_t</em>&nbsp;<code>ref_type&nbsp;&nbsp;&nbsp;&nbsp;</code></td>
- <td valign="top">IN: The reference type of <code>ref</code>.</td></tr>
- <tr>
- <td valign="top"><em>void *</em><code>ref</code></td>
- <td valign="top">IN: Reference to open.</td></tr>
- </table></ul>
-<dt><strong>Returns:</strong>
- <dd>Returns a valid identifier if successful;
- otherwise returns a negative value.
-<dt><strong>Fortran90 Interface:</strong> h5rget_region_f
- <dd>
- <pre>
-SUBROUTINE h5rget_region_f(dset_id, ref, space_id, hdferr)
- IMPLICIT NONE
- INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
- TYPE(hdset_reg_ref_t_f), INTENT(IN) :: ref ! Dataset region reference
- INTEGER(HID_T), INTENT(OUT) :: space_id ! Space identifier
- INTEGER, INTENT(OUT) :: hdferr ! Error code
-
-END SUBROUTINE h5rget_region_f
- </pre>
-
- <!--<dt><strong>Non-C API(s):</strong>
- <dd>
-
- <img src="Graphics/Java.gif">
- <img src="Graphics/C++.gif">
- -->
-</dl>
-
-<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" --><hr>
-<center>
-<table border=0 width=98%>
-<tr><td valign=top align=left>
-<a href="index.html">HDF5 documents and links</a>&nbsp;<br>
-<a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
-<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a>&nbsp;<br>
-<!--
-<a href="Glossary.html">Glossary</a><br>
--->
-</td>
-<td valign=top align=right>
-And in this document, the
-<a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;&nbsp;
-<br>
-<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5im.html">H5IM</a>&nbsp;&nbsp;
-<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5lt.html">H5LT</a>&nbsp;&nbsp;
-<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt.html">H5PT</a>&nbsp;&nbsp;
-<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5tb.html">H5TB</a>&nbsp;&nbsp;
-<br>
-<a href="RM_H5.html">H5</a>&nbsp;&nbsp;
-<a href="RM_H5A.html">H5A</a>&nbsp;&nbsp;
-<a href="RM_H5D.html">H5D</a>&nbsp;&nbsp;
-<a href="RM_H5E.html">H5E</a>&nbsp;&nbsp;
-<a href="RM_H5F.html">H5F</a>&nbsp;&nbsp;
-<a href="RM_H5G.html">H5G</a>&nbsp;&nbsp;
-<a href="RM_H5I.html">H5I</a>&nbsp;&nbsp;
-<a href="RM_H5P.html">H5P</a>&nbsp;&nbsp;
-<br>
-<a href="RM_H5R.html">H5R</a>&nbsp;&nbsp;
-<a href="RM_H5S.html">H5S</a>&nbsp;&nbsp;
-<a href="RM_H5T.html">H5T</a>&nbsp;&nbsp;
-<a href="RM_H5Z.html">H5Z</a>&nbsp;&nbsp;
-<a href="Tools.html">Tools</a>&nbsp;&nbsp;
-<a href="PredefDTypes.html">Datatypes</a>&nbsp;&nbsp;
-</td></tr>
-</table>
-</center>
-<hr><!-- #EndLibraryItem --><!-- #BeginLibraryItem "/ed_libs/Footer.lbi" --><address>
-<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
-<br>
-Describes HDF5 Release 1.7, the unreleased development branch; working toward HDF5 Release 1.8.0
-</address><!-- #EndLibraryItem --><SCRIPT LANGUAGE="JAVASCRIPT">
-<!--
-document.writeln("Last modified: 24 February 2004");
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