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<div class="section" id="the-pyqt4-extension-api">
<h1>The PyQt4 Extension API<a class="headerlink" href="#the-pyqt4-extension-api" title="Permalink to this headline">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified">New in version 4.12.</span></p>
</div>
<p>An important feature of PyQt4 (and SIP generated modules in general) is the
ability for other extension modules to build on top of it.
<a class="reference external" href="http://www.riverbankcomputing.com/software/qscintilla/">QScintilla</a> is
such an example.</p>
<p>PyQt4 provides an extension API that can be used by other modules. This has
the advantage of sharing code and also enforcing consistent behaviour. Part of
the API is accessable from Python and part from C++.</p>
<div class="section" id="python-api">
<h2>Python API<a class="headerlink" href="#python-api" title="Permalink to this headline">¶</a></h2>
<p>The Python part of the API is accessible via the <code class="xref py py-mod docutils literal"><span class="pre">QtCore</span></code> module
and is typically used by an extension module’s equivalent of PyQt4’s
<strong class="program">configure.py</strong>.</p>
<p>The API consists of <code class="xref py py-attr docutils literal"><span class="pre">PyQt4.QtCore.PYQT_CONFIGURATION</span></code> which is a dict
that describes how PyQt4 was configured. At the moment it contains a single
value called <code class="docutils literal"><span class="pre">sip_flags</span></code> which is a string containing the <code class="docutils literal"><span class="pre">-t</span></code> and <code class="docutils literal"><span class="pre">-x</span></code>
flags that were passed to the <strong class="program">sip</strong> executable by
<strong class="program">configure.py</strong>. Other extension modules must use the same flags in
their configuration.</p>
<p>This information is also provided by SIP v4’s <code class="xref py py-mod docutils literal"><span class="pre">sipconfig</span></code> module.
However this module will not be implemented by SIP v5.</p>
</div>
<div class="section" id="c-api">
<h2>C++ API<a class="headerlink" href="#c-api" title="Permalink to this headline">¶</a></h2>
<p>The C++ API is a set of functions. The addresses of each function is obtained
by calling SIP’s <code class="xref c c-func docutils literal"><span class="pre">sipImportSymbol()</span></code> function with the name of the
function required.</p>
<p>Several of the functions are provided as a replacement for SIP v4 features
(i.e. <code class="docutils literal"><span class="pre">SIP_ANYSLOT</span></code>, <code class="docutils literal"><span class="pre">SIP_QOBJECT</span></code>, <code class="docutils literal"><span class="pre">SIP_RXOBJ_CON</span></code>, <code class="docutils literal"><span class="pre">SIP_RXOBJ_DIS</span></code>,
<code class="docutils literal"><span class="pre">SIP_SIGNAL</span></code>, <code class="docutils literal"><span class="pre">SIP_SLOT</span></code>, <code class="docutils literal"><span class="pre">SIP_SLOT_CON</span></code> and <code class="docutils literal"><span class="pre">SIP_SLOT_DIS</span></code>) that are
not supported by SIP v5.</p>
<p>The functions exported by PyQt4 are as follows:</p>
<dl class="function">
<dt id="_CPPv220pyqt4_from_argv_listP8PyObjectRi">
<span id="pyqt4_from_argv_list__PyObjectP.iR"></span>char **<code class="descclassname"></code><code class="descname">pyqt4_from_argv_list</code><span class="sig-paren">(</span>PyObject *<em>argv_list</em>, int &<em>argc</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv220pyqt4_from_argv_listP8PyObjectRi" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Convert a Python list to a standard C array of command line arguments and
an argument count.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>argv_list</strong> – is the Python list of arguments.</li>
<li><strong>argc</strong> – is updated with the number of arguments in the list.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">an array of pointers to the arguments on the heap.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv227pyqt4_from_qvariant_by_typeR8QVariantP8PyObject">
<span id="pyqt4_from_qvariant_by_type__QVariantR.PyObjectP"></span>PyObject *<code class="descclassname"></code><code class="descname">pyqt4_from_qvariant_by_type</code><span class="sig-paren">(</span>QVariant &<em>value</em>, PyObject *<em>type</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv227pyqt4_from_qvariant_by_typeR8QVariantP8PyObject" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Convert a <code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code> to a Python object according to
an optional Python type.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>value</strong> – is the value to convert.</li>
<li><strong>type</strong> – is the Python type.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the converted value. If it is <code class="docutils literal"><span class="pre">0</span></code> then a Python exception will have
been raised.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv226pyqt4_get_connection_partsP8PyObjectP7QObjectPKcbPP7QObjectR10QByteArray">
<span id="pyqt4_get_connection_parts__PyObjectP.QObjectP.cCP.b.QObjectPP.QByteArrayR"></span>sipErrorState <code class="descclassname"></code><code class="descname">pyqt4_get_connection_parts</code><span class="sig-paren">(</span>PyObject *<em>slot</em>, QObject *<em>transmitter</em>, <em class="property">const</em> char *<em>signal_signature</em>, bool <em>single_shot</em>, QObject **<em>receiver</em>, QByteArray &<em>slot_signature</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv226pyqt4_get_connection_partsP8PyObjectP7QObjectPKcbPP7QObjectR10QByteArray" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Get the receiver object and slot signature to allow a signal to be
connected to an optional transmitter.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>slot</strong> – is the slot and should be a callable or a bound signal.</li>
<li><strong>transmitter</strong> – is the optional <code class="xref py py-class docutils literal"><span class="pre">QObject</span></code> transmitter.</li>
<li><strong>signal_signature</strong> – is the signature of the signal to be connected.</li>
<li><strong>single_shot</strong> – is <code class="docutils literal"><span class="pre">true</span></code> if the signal will only ever be emitted once.</li>
<li><strong>receiver</strong> – is updated with the <code class="xref py py-class docutils literal"><span class="pre">QObject</span></code> receiver. This may
be a proxy if the slot requires it.</li>
<li><strong>slot_signature</strong> – is updated with the signature of the slot.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the error state. If this is <code class="xref c c-data docutils literal"><span class="pre">sipErrorFail</span></code> then a Python
exception will have been raised.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv226pyqt4_get_pyqtsignal_partsP8PyObjectPP7QObject">
<span id="pyqt4_get_pyqtsignal_parts__PyObjectP.QObjectPP"></span><em class="property">const</em> char *<code class="descclassname"></code><code class="descname">pyqt4_get_pyqtsignal_parts</code><span class="sig-paren">(</span>PyObject *<em>signal</em>, QObject **<em>transmitter</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv226pyqt4_get_pyqtsignal_partsP8PyObjectPP7QObject" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Get the signal signature (and, optionally, the transmitter object) from a
signal.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>signal</strong> – is the signal.</li>
<li><strong>transmitter</strong> – if it is a non-zero value it is updated with the
<code class="xref py py-class docutils literal"><span class="pre">QObject</span></code> transmitter.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the signature of the signal. This will be zero if the signal not a
bound signal (if the transmitter was requested) or an unbound signal.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv224pyqt4_get_pyqtslot_partsP8PyObjectPP7QObjectR10QByteArray">
<span id="pyqt4_get_pyqtslot_parts__PyObjectP.QObjectPP.QByteArrayR"></span>sipErrorState <code class="descclassname"></code><code class="descname">pyqt4_get_pyqtslot_parts</code><span class="sig-paren">(</span>PyObject *<em>slot</em>, QObject **<em>receiver</em>, QByteArray &<em>slot_signature</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv224pyqt4_get_pyqtslot_partsP8PyObjectPP7QObjectR10QByteArray" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Get the receiver object and slot signature from a callable decorated with
<a class="reference internal" href="new_style_signals_slots.html#PyQt4.QtCore.pyqtSlot" title="PyQt4.QtCore.pyqtSlot"><code class="xref py py-func docutils literal"><span class="pre">pyqtSlot()</span></code></a>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>slot</strong> – is the callable slot.</li>
<li><strong>receiver</strong> – is updated with the <code class="xref py py-class docutils literal"><span class="pre">QObject</span></code> receiver.</li>
<li><strong>slot_signature</strong> – is updated with the signature of the slot.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the error state. If this is <code class="xref c c-data docutils literal"><span class="pre">sipErrorFail</span></code> then a Python
exception will have been raised.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv216pyqt4_get_signalP8PyObject">
<span id="pyqt4_get_signal__PyObjectP"></span><em class="property">const</em> char *<code class="descclassname"></code><code class="descname">pyqt4_get_signal</code><span class="sig-paren">(</span>PyObject *<em>signal</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv216pyqt4_get_signalP8PyObject" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Check that a Python object was returned by <code class="docutils literal"><span class="pre">SIGNAL()</span></code> or a signal object
and return the string.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>signal</strong> – is the signal.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">the string. It will be 0 if the object does not refer to a signal.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv214pyqt4_get_slotP8PyObject">
<span id="pyqt4_get_slot__PyObjectP"></span><em class="property">const</em> char *<code class="descclassname"></code><code class="descname">pyqt4_get_slot</code><span class="sig-paren">(</span>PyObject *<em>slot</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv214pyqt4_get_slotP8PyObject" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Check that a Python object was returned by <code class="docutils literal"><span class="pre">SLOT()</span></code> or <code class="docutils literal"><span class="pre">SIGNAL()</span></code> and
return the string.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>slot</strong> – is the slot.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">the slot. It will be 0 if the object does not refer to a slot.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv238pyqt4_register_from_qvariant_convertorPFbPK8QVariantPP8PyObjectE">
void <code class="descclassname"></code><code class="descname">pyqt4_register_from_qvariant_convertor</code><span class="sig-paren">(</span>bool (*<em>convertor</em>)<span class="sig-paren">(</span><em class="property">const</em> QVariant *, PyObject **<span class="sig-paren">)</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv238pyqt4_register_from_qvariant_convertorPFbPK8QVariantPP8PyObjectE" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Register a convertor function that converts a
<code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code> value to a Python object.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>convertor</strong> – is the convertor function. This takes two arguments. The first
argument is the <code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code> value to be converted.
The second argument is updated with a reference to the result of the
conversion and it will be <code class="docutils literal"><span class="pre">0</span></code>, and a Python exception raised, if
there was an error. The convertor will return <code class="docutils literal"><span class="pre">true</span></code> if the value
was handled so that no other convertor will be tried.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv236pyqt4_register_to_qvariant_convertorPFbP8PyObjectP8QVariantPbE">
void <code class="descclassname"></code><code class="descname">pyqt4_register_to_qvariant_convertor</code><span class="sig-paren">(</span>bool (*<em>convertor</em>)<span class="sig-paren">(</span>PyObject *, QVariant *, bool *<span class="sig-paren">)</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv236pyqt4_register_to_qvariant_convertorPFbP8PyObjectP8QVariantPbE" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Register a convertor function that converts a Python object to a
<code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code> value.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>convertor</strong> – is the convertor function. This takes three arguments. The first
argument is the Python object to be converted. The second argument is a
pointer to <code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code> value that is updated with
the result of the conversion. The third argument is updated with an
error flag which will be <code class="docutils literal"><span class="pre">false</span></code>, and a Python exception raised, if
there was an error. The convertor will return <code class="docutils literal"><span class="pre">true</span></code> if the value
was handled so that no other convertor will be tried.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv241pyqt4_register_to_qvariant_data_convertorPFbP8PyObjectPviPbE">
void <code class="descclassname"></code><code class="descname">pyqt4_register_to_qvariant_data_convertor</code><span class="sig-paren">(</span>bool (*<em>convertor</em>)<span class="sig-paren">(</span>PyObject *, void *, int, bool *<span class="sig-paren">)</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv241pyqt4_register_to_qvariant_data_convertorPFbP8PyObjectPviPbE" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Register a convertor function that converts a Python object to the
pre-allocated data of a <code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code> value.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>convertor</strong> – is the convertor function. This takes four arguments. The first
argument is the Python object to be converted. The second argument is a
pointer to the pre-allocated data of a <code class="xref py py-class docutils literal"><span class="pre">QVariant</span></code>
value that is updated with the result of the conversion. The third
argument is the meta-type of the value. The fourth argument is updated
with an error flag which will be <code class="docutils literal"><span class="pre">false</span></code>, and a Python exception
raised, if there was an error. The convertor will return <code class="docutils literal"><span class="pre">true</span></code> if
the value was handled so that no other convertor will be tried.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="_CPPv222pyqt4_update_argv_listP8PyObjectiPPc">
<span id="pyqt4_update_argv_list__PyObjectP.i.cPP"></span>void <code class="descclassname"></code><code class="descname">pyqt4_update_argv_list</code><span class="sig-paren">(</span>PyObject *<em>argv_list</em>, int <em>argc</em>, char **<em>argv</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv222pyqt4_update_argv_listP8PyObjectiPPc" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Update a Python list from a standard C array of command line arguments and
an argument count. This is used in conjunction with
<a class="reference internal" href="#_CPPv220pyqt4_from_argv_listP8PyObjectRi" title="pyqt4_from_argv_list"><code class="xref cpp cpp-func docutils literal"><span class="pre">pyqt4_from_argv_list()</span></code></a> to handle the updating of argument lists
after calling constructors of classes such as
<code class="xref py py-class docutils literal"><span class="pre">QCoreApplication</span></code>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>argv_list</strong> – is the Python list of arguments that will be updated.</li>
<li><strong>argc</strong> – is the number of command line arguments.</li>
<li><strong>argv</strong> – is the array of pointers to the arguments on the heap.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">The PyQt4 Extension API</a><ul>
<li><a class="reference internal" href="#python-api">Python API</a></li>
<li><a class="reference internal" href="#c-api">C++ API</a></li>
</ul>
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