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<div class="headertitle"><div class="title">Creating an Group</div></div>
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<div class="textblock"><p>Navigate back: <a class="el" href="index.html">Main</a> / <a class="el" href="_getting_started.html">Getting Started with HDF5</a> / <a class="el" href="_learn_basics.html">Learning the Basics</a> </p><hr />
<h1><a class="anchor" id="secLBGrpCreate"></a>
Creating an group</h1>
<p>An HDF5 group is a structure containing zero or more HDF5 objects. The two primary HDF5 objects are groups and datasets. To create a group, the calling program must: </p><ol>
<li>
Obtain the location identifier where the group is to be created. </li>
<li>
Create the group. </li>
<li>
Close the group. </li>
</ol>
<p>To create a group, the calling program must call <a class="el" href="group___h5_g.html#ga187cee27a9fc4f1a311eb19b0522c7b8">H5Gcreate</a>. To close the group, <a class="el" href="group___h5_g.html#ga8dbe20b390d2504f0bd3589ed8f4e221" title="Closes the specified group.">H5Gclose</a> must be called. The close call is mandatory.</p>
<p>For example:</p>
<p><em>C</em> </p><div class="fragment"><div class="line">group_id = <a class="code hl_define" href="group___h5_g.html#ga187cee27a9fc4f1a311eb19b0522c7b8">H5Gcreate</a>(file_id, <span class="stringliteral">"/MyGroup"</span>, <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_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>);</div>
<div class="line">status = <a class="code hl_function" href="group___h5_g.html#ga8dbe20b390d2504f0bd3589ed8f4e221">H5Gclose</a> (group_id);</div>
<div class="ttc" id="a_h5_ppublic_8h_html_afa85e97bfbf9bf1c58e39263846c568f"><div class="ttname"><a href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a></div><div class="ttdeci">#define H5P_DEFAULT</div><div class="ttdef"><b>Definition</b> H5Ppublic.h:102</div></div>
<div class="ttc" id="agroup___h5_g_html_ga187cee27a9fc4f1a311eb19b0522c7b8"><div class="ttname"><a href="group___h5_g.html#ga187cee27a9fc4f1a311eb19b0522c7b8">H5Gcreate</a></div><div class="ttdeci">#define H5Gcreate</div><div class="ttdef"><b>Definition</b> H5version.h:997</div></div>
<div class="ttc" id="agroup___h5_g_html_ga8dbe20b390d2504f0bd3589ed8f4e221"><div class="ttname"><a href="group___h5_g.html#ga8dbe20b390d2504f0bd3589ed8f4e221">H5Gclose</a></div><div class="ttdeci">herr_t H5Gclose(hid_t group_id)</div><div class="ttdoc">Closes the specified group.</div></div>
</div><!-- fragment --><p><em>Fortran</em> </p><div class="fragment"><div class="line">CALL h5gcreate_f (loc_id, name, group_id, error)</div>
<div class="line">CALL h5gclose_f (group_id, error)</div>
</div><!-- fragment --><h1><a class="anchor" id="secLBGrpCreateRWEx"></a>
Programming Example</h1>
<h2><a class="anchor" id="secLBGrpCreateRWExDesc"></a>
Description</h2>
<p>See <a class="el" href="_l_b_examples.html">Examples from Learning the Basics</a> for the examples used in the <a class="el" href="_learn_basics.html">Learning the Basics</a> tutorial.</p>
<p>The example shows how to create and close a group. It creates a file called <code style="background-color:whitesmoke;">group.h5</code> in C (<code style="background-color:whitesmoke;">groupf.h5</code> for FORTRAN), creates a group called MyGroup in the root group, and then closes the group and file.</p>
<p>For details on compiling an HDF5 application: [ <a class="el" href="_l_b_compiling.html">Compiling HDF5 Applications</a> ]</p>
<h2><a class="anchor" id="secLBGrpCreateRWExCont"></a>
File Contents</h2>
<p>Shown below is the contents and the definition of the group of <code style="background-color:whitesmoke;">group.h5</code> (created by the C program). (The FORTRAN program creates the HDF5 file <code style="background-color:whitesmoke;">groupf.h5</code> and the resulting DDL shows the filename <code style="background-color:whitesmoke;">groupf.h5</code> in the first line.) </p><table class="doxtable">
<caption>The Contents of group.h5.</caption>
<tr>
<td><div class="image">
<img src="imggrpcreate.gif" alt=""/>
</div>
</td></tr>
</table>
<p><em>group.h5 in DDL</em> </p><div class="fragment"><div class="line">HDF5 <span class="stringliteral">"group.h5"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"/"</span> {</div>
<div class="line"> GROUP <span class="stringliteral">"MyGroup"</span> {</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line">}</div>
</div><!-- fragment --><hr />
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