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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>
<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.
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