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    <title>clGetPlatformIDs</title>
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      <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">
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="scalarDataTypes.html" target="_top">cl_int</a> <strong class="fsfunc">clGetPlatformIDs</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_entries</var>, </td>
              </td>
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              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">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="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*num_platforms</var><code>)</code></td>
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      <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 cl_platform_id 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 cl_platform_id 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>
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      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
Returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully. Otherwise it returns  <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.
		</p>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p><img src="pdficon_small1.gif" />
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=29" 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>
        </p>
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      <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>
			Copyright © 
    Copyright © 2007-2009 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
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials. 
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