<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/control/qaxbindable.cpp:185 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>QAxAggregated Class</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <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> <p>The QAxAggregated class is an abstract base class for implementations of additional COM interfaces. <a href="#details">More...</a> <p>This class is part of the <b>Qt ActiveQt Extension</b>. <p><tt>#include <<a href="qaxbindable-h.html">qaxbindable.h</a>></tt> <p><a href="qaxaggregated-members.html">List of all member functions.</a> <h2>Public Members</h2> <ul> <li class=fn>virtual long <a href="#queryInterface"><b>queryInterface</b></a> ( const QUuid & iid, void ** iface ) = 0</li> </ul> <h2>Protected Members</h2> <ul> <li class=fn>IUnknown * <a href="#controllingUnknown"><b>controllingUnknown</b></a> () const</li> <li class=fn>QWidget * <a href="#widget"><b>widget</b></a> () const</li> <li class=fn>QObject * <a href="#object"><b>object</b></a> () const</li> </ul> <hr><a name="details"></a><h2>Detailed Description</h2> <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. <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="#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 QueryInterface(), AddRef() and Release() to the interface provided by <a href="#controllingUnknown">controllingUnknown</a>(). <p> Use the <a href="#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="qguardedptr.html">QGuardedPtr</a>), as the QWidget can be destroyed by the ActiveQt framework at any time. <hr><h2>Member Function Documentation</h2> <h3 class=fn>IUnknown * <a name="controllingUnknown"></a>QAxAggregated::controllingUnknown () const<tt> [protected]</tt> </h3> <p> Returns the IUnknown interface of the ActiveX control. Implement the IUnknown interface in your QAxAggregated subclass to delegate calls to QueryInterface(), AddRef() and Release() to the interface provided by this function. <p> <pre> HRESULT AxImpl::QueryInterface( REFIID iid, void **iface ) { return controllingUnknown()->QueryInterface( iid, iface ); } unsigned long AxImpl::AddRef() { return controllingUnknown()->AddRef(); } unsigned long AxImpl::Release() { return controllingUnknown()->Release(); } </pre> <p> The QAXAGG_IUNKNOWN macro expands to the code above, and you can use it in the class declaration of your subclass. <h3 class=fn><a href="qobject.html">QObject</a> * <a name="object"></a>QAxAggregated::object () 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> <b>Warning:</b> You must not store the returned pointer, unless you use a <a href="qguardedptr.html">QGuardedPtr</a>, since the QObject can be destroyed by <a href="activeqt.html#ActiveQt">ActiveQt</a> at any time. <h3 class=fn>long <a name="queryInterface"></a>QAxAggregated::queryInterface ( const <a href="quuid.html">QUuid</a> & iid, void ** iface )<tt> [pure virtual]</tt> </h3> <p> Reimplement this pure virtual function to support additional COM interfaces. Set the value of <em>iface</em> to point to this object to support the interface <em>iid</em>. Note that you must cast the <tt>this</tt> pointer to the appropriate superclass. <p> <pre> long AxImpl::queryInterface( const <a href="quuid.html">QUuid</a> &iid, void **iface ) { *iface = 0; if ( iid == IID_ISomeCOMInterface ) *iface = (ISomeCOMInterface*)this; else return E_NOINTERFACE; AddRef(); return S_OK; } </pre> <p> Return the standard COM results S_OK (interface is supported) or E_NOINTERFACE (requested interface is not supported). <p> <b>Warning:</b> Even though you must implement the IUnknown interface if you implement any COM interface you must not support the IUnknown interface in your <a href="#queryInterface">queryInterface</a>() implementation. <h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="widget"></a>QAxAggregated::widget () 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> <b>Warning:</b> You must not store the returned pointer, unless you use a <a href="qguardedptr.html">QGuardedPtr</a>, since the QWidget can be destroyed by <a href="activeqt.html#ActiveQt">ActiveQt</a> at any time. <!-- eof --> <hr><p> This file is part of the <a href="index.html">Qt toolkit</a>. Copyright © 1995-2007 <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>Qt 3.3.8</div> </table></div></address></body> </html>