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/usr/share/doc/python2-docs/html/c-api/cobject.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>CObjects — Python 2.7.16 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.16 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="Cell Objects" href="cell.html" /> <link rel="prev" title="Capsules" href="capsule.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/c-api/cobject.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="cell.html" title="Cell Objects" accesskey="N">next</a> |</li> <li class="right" > <a href="capsule.html" title="Capsules" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-2"><a href="concrete.html" accesskey="U">Concrete Objects Layer</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="cobjects"> <span id="id1"></span><h1>CObjects<a class="headerlink" href="#cobjects" title="Permalink to this headline">¶</a></h1> <div class="admonition warning" id="index-0"> <p class="first admonition-title">Warning</p> <p class="last">The CObject API is deprecated as of Python 2.7. Please switch to the new <a class="reference internal" href="capsule.html#capsules"><span class="std std-ref">Capsules</span></a> API.</p> </div> <dl class="type"> <dt id="c.PyCObject"> <code class="descname">PyCObject</code><a class="headerlink" href="#c.PyCObject" title="Permalink to this definition">¶</a></dt> <dd><p>This subtype of <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyObject</span></code></a> represents an opaque value, useful for C extension modules who need to pass an opaque value (as a <code class="xref c c-type docutils literal notranslate"><span class="pre">void*</span></code> pointer) through Python code to other C code. It is often used to make a C function pointer defined in one module available to other modules, so the regular import mechanism can be used to access C APIs defined in dynamically loaded modules.</p> </dd></dl> <dl class="function"> <dt id="c.PyCObject_Check"> int <code class="descname">PyCObject_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *p</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCObject_Check" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if its argument is a <a class="reference internal" href="#c.PyCObject" title="PyCObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCObject</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="c.PyCObject_FromVoidPtr"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCObject_FromVoidPtr</code><span class="sig-paren">(</span>void*<em> cobj</em>, void (<em>*destr</em>)(void *)<span class="sig-paren">)</span><a class="headerlink" href="#c.PyCObject_FromVoidPtr" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a <a class="reference internal" href="#c.PyCObject" title="PyCObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCObject</span></code></a> from the <code class="docutils literal notranslate"><span class="pre">void</span> <span class="pre">*</span></code> <em>cobj</em>. The <em>destr</em> function will be called when the object is reclaimed, unless it is <em>NULL</em>.</p> </dd></dl> <dl class="function"> <dt id="c.PyCObject_FromVoidPtrAndDesc"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCObject_FromVoidPtrAndDesc</code><span class="sig-paren">(</span>void*<em> cobj</em>, void*<em> desc</em>, void (<em>*destr</em>)(void *, void *)<span class="sig-paren">)</span><a class="headerlink" href="#c.PyCObject_FromVoidPtrAndDesc" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a <a class="reference internal" href="#c.PyCObject" title="PyCObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCObject</span></code></a> from the <code class="xref c c-type docutils literal notranslate"><span class="pre">void</span> <span class="pre">*</span></code> <em>cobj</em>. The <em>destr</em> function will be called when the object is reclaimed. The <em>desc</em> argument can be used to pass extra callback data for the destructor function.</p> </dd></dl> <dl class="function"> <dt id="c.PyCObject_AsVoidPtr"> void* <code class="descname">PyCObject_AsVoidPtr</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>*<em> self</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCObject_AsVoidPtr" title="Permalink to this definition">¶</a></dt> <dd><p>Return the object <code class="xref c c-type docutils literal notranslate"><span class="pre">void</span> <span class="pre">*</span></code> that the <a class="reference internal" href="#c.PyCObject" title="PyCObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCObject</span></code></a> <em>self</em> was created with.</p> </dd></dl> <dl class="function"> <dt id="c.PyCObject_GetDesc"> void* <code class="descname">PyCObject_GetDesc</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>*<em> self</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCObject_GetDesc" title="Permalink to this definition">¶</a></dt> <dd><p>Return the description <code class="xref c c-type docutils literal notranslate"><span class="pre">void</span> <span class="pre">*</span></code> that the <a class="reference internal" href="#c.PyCObject" title="PyCObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCObject</span></code></a> <em>self</em> was created with.</p> </dd></dl> <dl class="function"> <dt id="c.PyCObject_SetVoidPtr"> int <code class="descname">PyCObject_SetVoidPtr</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>*<em> self</em>, void*<em> cobj</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCObject_SetVoidPtr" title="Permalink to this definition">¶</a></dt> <dd><p>Set the void pointer inside <em>self</em> to <em>cobj</em>. The <a class="reference internal" href="#c.PyCObject" title="PyCObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCObject</span></code></a> must not have an associated destructor. Return true on success, false on failure.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="capsule.html" title="previous chapter">Capsules</a></p> <h4>Next topic</h4> <p class="topless"><a href="cell.html" title="next chapter">Cell Objects</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/c-api/cobject.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="cell.html" title="Cell Objects" >next</a> |</li> <li class="right" > <a href="capsule.html" title="Capsules" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-2"><a href="concrete.html" >Concrete Objects Layer</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2019, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Mar 27, 2019. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.7.6. </div> </body> </html>
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