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<title>clGetPlatformIDs</title>
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<div class="refentry">
<a id="id-1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clGetPlatformIDs"></a>
<h1>clGetPlatformIDs</h1>
<p>Obtain the list of platforms available.</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> <strong class="fsfunc">clGetPlatformIDs</strong>(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_entries</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_platform_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*platforms</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*num_platforms</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="varname">num_entries</code>
</span>
</dt>
<dd>
<p>
The number of <a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_platform_id</a>
entries that can be added to <code class="varname">platforms</code>. If
<code class="varname">platforms</code> is not NULL, the <code class="varname">num_entries</code>
must be greater than zero.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">platforms</code>
</span>
</dt>
<dd>
<p>
Returns a list of OpenCL platforms found. The <a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_platform_id</a> values returned
in <code class="varname">platforms</code> can be used to identify a specific OpenCL
platform. If <code class="varname">platforms</code> argument is NULL, this argument
is ignored. The number of OpenCL platforms returned is the mininum of the
value specified by <code class="varname">num_entries</code> or the number of OpenCL
platforms available.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">num_platforms</code>
</span>
</dt>
<dd>
<p>
Returns the number of OpenCL platforms available. If
<code class="varname">num_platforms</code> is NULL, this argument is ignored.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns <span class="errorname">CL_SUCCESS</span> if the function is executed
successfully. If the
<a class="citerefentry" href="cl_khr_icd.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_icd</span></span></a>
extension is enabled, <code class="function">clGetPlatformIDs</code> returns
<span class="errorname">CL_SUCCESS</span> if the function is executed successfully
and there are a non zero number of platforms available.
</p>
<p>
Otherwise it returns one of the following errors:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_entries</code>
is equal to zero and <code class="varname">platforms</code> is not NULL or if
both <code class="varname">num_platforms</code> and
<code class="varname">platforms</code> are NULL.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_PLATFORM_NOT_FOUND_KHR</span> if the
<a class="citerefentry" href="cl_khr_icd.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_icd</span></span></a>
extension is enabled and no platforms are found.
</li>
</ul>
</div>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p><img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#page=62" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>,
<a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>,
<a class="citerefentry" href="classDiagram.html"><span class="citerefentry"><span class="refentrytitle">Cardinality Diagram</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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