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<h1 class="title">QAxAggregated Class Reference</h1>
<!-- $$$QAxAggregated-brief -->
<p>The QAxAggregated class is an abstract base class for implementations of additional COM interfaces. <a href="#details">More...</a></p>
<!-- @@@QAxAggregated -->
<pre class="cpp"> <span class="preprocessor">#include &lt;QAxAggregated&gt;</span></pre><ul>
<li><a href="qaxaggregated-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual long </td><td class="memItemRight bottomAlign"><b><a href="qaxaggregated.html#queryInterface">queryInterface</a></b> ( const QUuid &amp; <i>iid</i>, void ** <i>iface</i> ) = 0</td></tr>
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<h2>Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qaxaggregated.html#dtor.QAxAggregated">~QAxAggregated</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> IUnknown * </td><td class="memItemRight bottomAlign"><b><a href="qaxaggregated.html#controllingUnknown">controllingUnknown</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QObject * </td><td class="memItemRight bottomAlign"><b><a href="qaxaggregated.html#object">object</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QWidget * </td><td class="memItemRight bottomAlign"><b><a href="qaxaggregated.html#widget">widget</a></b> () const</td></tr>
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<!-- $$$QAxAggregated-description -->
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<h2>Detailed Description</h2>
<p>The QAxAggregated class is an abstract base class for implementations of additional COM interfaces.</p>
<p>Create a subclass of QAxAggregated and reimplement <a href="qaxaggregated.html#queryInterface">queryInterface</a>() to support additional COM interfaces. Use multiple inheritance from those COM interfaces. Implement the IUnknown interface of those COM interfaces by delegating the calls to <tt>QueryInterface()</tt>, <tt>AddRef()</tt> and <tt>Release()</tt> to the interface provided by <a href="qaxaggregated.html#controllingUnknown">controllingUnknown</a>().</p>
<p>Use the <a href="qaxaggregated.html#widget">widget</a>() method if you need to make calls to the <a href="qwidget.html">QWidget</a> implementing the ActiveX control. You must not store that pointer in your subclass (unless you use <a href="qpointer.html">QPointer</a>), as the <a href="qwidget.html">QWidget</a> can be destroyed by the <a href="activeqt.html#activeqt">ActiveQt</a> framework at any time.</p>
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<p><b>See also </b><a href="qaxbindable.html">QAxBindable</a>, <a href="qaxfactory.html">QAxFactory</a>, and <a href="activeqt.html">Qt's ActiveX Framework (ActiveQt)</a>.</p>
<!-- @@@QAxAggregated -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$~QAxAggregated[overload1]$$$~QAxAggregated -->
<h3 class="fn"><a name="dtor.QAxAggregated"></a>QAxAggregated::<span class="name">~QAxAggregated</span> ()<tt> [virtual protected]</tt></h3>
<p>The destructor is called internally by Qt.</p>
<!-- @@@~QAxAggregated -->
<!-- $$$controllingUnknown[overload1]$$$controllingUnknown -->
<h3 class="fn"><a name="controllingUnknown"></a><span class="type">IUnknown</span> * QAxAggregated::<span class="name">controllingUnknown</span> () const<tt> [protected]</tt></h3>
<p>Returns the <tt>IUnknown</tt> interface of the ActiveX control. Implement the <tt>IUnknown</tt> interface in your <a href="qaxaggregated.html">QAxAggregated</a> subclass to delegate calls to <tt>QueryInterface()</tt>, <tt>AddRef()</tt>, and <tt>Release()</tt> to the interface provided by this function.</p>
<pre class="cpp"> HRESULT AxImpl<span class="operator">::</span>QueryInterface(REFIID iid<span class="operator">,</span> <span class="type">void</span> <span class="operator">*</span><span class="operator">*</span>iface)
{
<span class="keyword">return</span> controllingUnknown()<span class="operator">-</span><span class="operator">&gt;</span>QueryInterface(iid<span class="operator">,</span> iface);
}
<span class="type"><a href="qtglobal.html#ulong-typedef">ulong</a></span> AxImpl<span class="operator">::</span>AddRef()
{
<span class="keyword">return</span> controllingUnknown()<span class="operator">-</span><span class="operator">&gt;</span>AddRef();
}
<span class="type"><a href="qtglobal.html#ulong-typedef">ulong</a></span> AxImpl<span class="operator">::</span>Release()
{
<span class="keyword">return</span> controllingUnknown()<span class="operator">-</span><span class="operator">&gt;</span>Release();
}</pre>
<p>Instead of declaring and implementing these three functions manually, you can use the <tt>QAXAGG_IUNKNOWN</tt> macro in the class declaration of your subclass.</p>
<!-- @@@controllingUnknown -->
<!-- $$$object[overload1]$$$object -->
<h3 class="fn"><a name="object"></a><span class="type"><a href="qobject.html">QObject</a></span> * QAxAggregated::<span class="name">object</span> () const<tt> [protected]</tt></h3>
<p>Returns a pointer to the <a href="qobject.html">QObject</a> subclass implementing the COM object. This function might return 0.</p>
<p><b>Warning:</b> You must not store the returned pointer, unless you use a <a href="qpointer.html">QPointer</a>, since the <a href="qobject.html">QObject</a> can be destroyed by <a href="activeqt.html#activeqt">ActiveQt</a> at any time.</p>
<!-- @@@object -->
<!-- $$$queryInterface[overload1]$$$queryInterfaceconstQUuid&void** -->
<h3 class="fn"><a name="queryInterface"></a><span class="type">long</span> QAxAggregated::<span class="name">queryInterface</span> ( const <span class="type"><a href="quuid.html">QUuid</a></span> &amp; <i>iid</i>, <span class="type">void</span> ** <i>iface</i> )<tt> [pure virtual]</tt></h3>
<p>Reimplement this pure virtual function to support additional COM interfaces. Set the value of <i>iface</i> to point to this object to support the interface <i>iid</i>. Note that you must cast the <tt>this</tt> pointer to the appropriate superclass.</p>
<pre class="cpp"> <span class="type">long</span> AxImpl<span class="operator">::</span>queryInterface(<span class="keyword">const</span> <span class="type"><a href="quuid.html">QUuid</a></span> <span class="operator">&amp;</span>iid<span class="operator">,</span> <span class="type">void</span> <span class="operator">*</span><span class="operator">*</span>iface)
{
<span class="operator">*</span>iface <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">if</span> (iid <span class="operator">=</span><span class="operator">=</span> IID_ISomeCOMInterface)
<span class="operator">*</span>iface <span class="operator">=</span> (ISomeCOMInterface<span class="operator">*</span>)<span class="keyword">this</span>;
<span class="keyword">else</span>
<span class="keyword">return</span> E_NOINTERFACE;
AddRef();
<span class="keyword">return</span> S_OK;
}</pre>
<p>Return the standard COM results <tt>S_OK</tt> (interface is supported) or <tt>E_NOINTERFACE</tt> (requested interface is not supported).</p>
<p><b>Warning:</b> Even though you must implement the <tt>IUnknown</tt> interface if you implement any COM interface you must not support the <tt>IUnknown</tt> interface in your queryInterface() implementation.</p>
<!-- @@@queryInterface -->
<!-- $$$widget[overload1]$$$widget -->
<h3 class="fn"><a name="widget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> * QAxAggregated::<span class="name">widget</span> () const<tt> [protected]</tt></h3>
<p>Returns a pointer to the <a href="qwidget.html">QWidget</a> subclass implementing the ActiveX control. This function might return 0.</p>
<p><b>Warning:</b> You must not store the returned pointer, unless you use a <a href="qpointer.html">QPointer</a>, since the <a href="qwidget.html">QWidget</a> can be destroyed by <a href="activeqt.html#activeqt">ActiveQt</a> at any time.</p>
<!-- @@@widget -->
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