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QAxAggregated(3qt)							       QAxAggregated(3qt)

NAME
       QAxAggregated - Abstract base class for implementations of additional COM interfaces

SYNOPSIS
       This class is part of the Qt ActiveQt Extension.

       #include <qaxbindable.h>

   Public Members
       virtual long queryInterface ( const QUuid & iid, void ** iface ) = 0

   Protected Members
       IUnknown * controllingUnknown () const
       QWidget * widget () const
       QObject * object () const

DESCRIPTION
       This class is defined in the Qt ActiveQt Extension, which can be found in the
       qt/extensions directory. It is not included in the main Qt API.

       The QAxAggregated class is an abstract base class for implementations of additional COM
       interfaces.

       Create a subclass of QAxAggregated and reimplement queryInterface() 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 controllingUnknown().

       Use the widget() method if you need to make calls to the QWidget implementing the ActiveX
       control. You must not store that pointer in your subclass (unless you use QGuardedPtr), as
       the QWidget can be destroyed by the ActiveQt framework at any time.

MEMBER FUNCTION DOCUMENTATION
IUnknown * QAxAggregated::controllingUnknown () const [protected]
       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.

	   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();
	   }

       The QAXAGG_IUNKNOWN macro expands to the code above, and you can use it in the class
       declaration of your subclass.

QObject * QAxAggregated::object () const [protected]
       Returns a pointer to the QObject subclass implementing the COM object. This function might
       return 0.

       Warning: You must not store the returned pointer, unless you use a QGuardedPtr, since the
       QObject can be destroyed by ActiveQt at any time.

long QAxAggregated::queryInterface ( const QUuid & iid, void ** iface ) [pure virtual]
       Reimplement this pure virtual function to support additional COM interfaces. Set the value
       of iface to point to this object to support the interface iid. Note that you must cast the
       this pointer to the appropriate superclass.

	   long AxImpl::queryInterface( const QUuid &iid, void **iface )
	   {
	       *iface = 0;
	       if ( iid == IID_ISomeCOMInterface )
		   *iface = (ISomeCOMInterface*)this;
	       else
		   return E_NOINTERFACE;
	       AddRef();
	       return S_OK;
	   }

       Return the standard COM results S_OK (interface is supported) or E_NOINTERFACE (requested
       interface is not supported).

       Warning: Even though you must implement the IUnknown interface if you implement any COM
       interface you must not support the IUnknown interface in your queryInterface()
       implementation.

QWidget * QAxAggregated::widget () const [protected]
       Returns a pointer to the QWidget subclass implementing the ActiveX control. This function
       might return 0.

       Warning: You must not store the returned pointer, unless you use a QGuardedPtr, since the
       QWidget can be destroyed by ActiveQt at any time.

SEE ALSO
       http://doc.trolltech.com/qaxaggregated.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the license file
       included in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qaxaggregated.3qt) and the Qt version (3.3.8).

Trolltech AS				 2 February 2007		       QAxAggregated(3qt)
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