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156 lines
6.6 KiB
156 lines
6.6 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/control/qaxbindable.cpp:185 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QAxAggregated Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QAxAggregated Class Reference<br><small>[<a href="qaxserver.html">QAxServer module</a>]</small></h1>
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<p>The QAxAggregated class is an abstract base class for implementations of
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additional COM interfaces.
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<a href="#details">More...</a>
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<p>This class is part of the <b>Qt ActiveQt Extension</b>.
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<p><tt>#include <<a href="qaxbindable-h.html">qaxbindable.h</a>></tt>
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<p><a href="qaxaggregated-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>virtual long <a href="#queryInterface"><b>queryInterface</b></a> ( const QUuid & iid, void ** iface ) = 0</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>IUnknown * <a href="#controllingUnknown"><b>controllingUnknown</b></a> () const</li>
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<li class=fn>QWidget * <a href="#widget"><b>widget</b></a> () const</li>
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<li class=fn>QObject * <a href="#object"><b>object</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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<p> This class is defined in the <b>Qt <a href="activeqt.html#ActiveQt">ActiveQt</a> Extension</b>, which can be found in the <tt>qt/extensions</tt> directory. It is not included in the main Qt API.
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<p>
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The QAxAggregated class is an abstract base class for implementations of
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additional COM interfaces.
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<p>
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<p> Create a subclass of QAxAggregated and reimplement
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<a href="#queryInterface">queryInterface</a>() to support additional COM interfaces. Use
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multiple inheritance from those COM interfaces. Implement the
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IUnknown interface of those COM interfaces by delegating the calls
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to QueryInterface(), AddRef() and Release() to the interface
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provided by <a href="#controllingUnknown">controllingUnknown</a>().
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<p> Use the <a href="#widget">widget</a>() method if you need to make calls to the <a href="qwidget.html">QWidget</a>
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implementing the ActiveX control. You must not store that pointer
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in your subclass (unless you use <a href="qguardedptr.html">QGuardedPtr</a>), as the QWidget can
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be destroyed by the ActiveQt framework at any time.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn>IUnknown * <a name="controllingUnknown"></a>QAxAggregated::controllingUnknown () const<tt> [protected]</tt>
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</h3>
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<p> Returns the IUnknown interface of the ActiveX control. Implement
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the IUnknown interface in your QAxAggregated subclass to delegate
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calls to QueryInterface(), AddRef() and Release() to the interface
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provided by this function.
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<p> <pre>
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HRESULT AxImpl::QueryInterface( REFIID iid, void **iface )
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{
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return controllingUnknown()->QueryInterface( iid, iface );
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}
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unsigned long AxImpl::AddRef()
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{
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return controllingUnknown()->AddRef();
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}
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unsigned long AxImpl::Release()
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{
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return controllingUnknown()->Release();
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}
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</pre>
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<p> The QAXAGG_IUNKNOWN macro expands to the code above, and you can
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use it in the class declaration of your subclass.
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<h3 class=fn><a href="qobject.html">QObject</a> * <a name="object"></a>QAxAggregated::object () const<tt> [protected]</tt>
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</h3>
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<p> Returns a pointer to the <a href="qobject.html">QObject</a> subclass implementing the COM object.
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This function might return 0.
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<p> <b>Warning:</b>
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You must not store the returned pointer, unless you use a
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<a href="qguardedptr.html">QGuardedPtr</a>, since the QObject can be destroyed by <a href="activeqt.html#ActiveQt">ActiveQt</a> at any
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time.
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<h3 class=fn>long <a name="queryInterface"></a>QAxAggregated::queryInterface ( const <a href="quuid.html">QUuid</a> & iid, void ** iface )<tt> [pure virtual]</tt>
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</h3>
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<p> Reimplement this pure virtual function to support additional COM
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interfaces. Set the value of <em>iface</em> to point to this object to
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support the interface <em>iid</em>. Note that you must cast the <tt>this</tt> pointer to the appropriate superclass.
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<p> <pre>
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long AxImpl::queryInterface( const <a href="quuid.html">QUuid</a> &iid, void **iface )
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{
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*iface = 0;
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if ( iid == IID_ISomeCOMInterface )
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*iface = (ISomeCOMInterface*)this;
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else
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return E_NOINTERFACE;
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AddRef();
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return S_OK;
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}
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</pre>
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<p> Return the standard COM results S_OK (interface is supported) or
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E_NOINTERFACE (requested interface is not supported).
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<p> <b>Warning:</b>
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Even though you must implement the IUnknown interface if you
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implement any COM interface you must not support the IUnknown
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interface in your <a href="#queryInterface">queryInterface</a>() implementation.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="widget"></a>QAxAggregated::widget () const<tt> [protected]</tt>
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</h3>
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<p> Returns a pointer to the <a href="qwidget.html">QWidget</a> subclass implementing the ActiveX control.
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This function might return 0.
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<p> <b>Warning:</b>
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You must not store the returned pointer, unless you use a
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<a href="qguardedptr.html">QGuardedPtr</a>, since the QWidget can be destroyed by <a href="activeqt.html#ActiveQt">ActiveQt</a> at any
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time.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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|
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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||
|
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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