1QAxAggregated(3qt)                                          QAxAggregated(3qt)
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NAME

6       QAxAggregated - Abstract base class for implementations of additional
7       COM interfaces
8

SYNOPSIS

10       This class is part of the Qt ActiveQt Extension.
11
12       #include <qaxbindable.h>
13
14   Public Members
15       virtual long queryInterface ( const QUuid & iid, void ** iface ) = 0
16
17   Protected Members
18       IUnknown * controllingUnknown () const
19       QWidget * widget () const
20       QObject * object () const
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DESCRIPTION

23       This class is defined in the Qt ActiveQt Extension, which can be found
24       in the qt/extensions directory. It is not included in the main Qt API.
25
26       The QAxAggregated class is an abstract base class for implementations
27       of additional COM interfaces.
28
29       Create a subclass of QAxAggregated and reimplement queryInterface() to
30       support additional COM interfaces. Use multiple inheritance from those
31       COM interfaces. Implement the IUnknown interface of those COM
32       interfaces by delegating the calls to QueryInterface(), AddRef() and
33       Release() to the interface provided by controllingUnknown().
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35       Use the widget() method if you need to make calls to the QWidget
36       implementing the ActiveX control. You must not store that pointer in
37       your subclass (unless you use QGuardedPtr), as the QWidget can be
38       destroyed by the ActiveQt framework at any time.
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MEMBER FUNCTION DOCUMENTATION

IUnknown * QAxAggregated::controllingUnknown () const [protected]

42       Returns the IUnknown interface of the ActiveX control. Implement the
43       IUnknown interface in your QAxAggregated subclass to delegate calls to
44       QueryInterface(), AddRef() and Release() to the interface provided by
45       this function.
46
47           HRESULT AxImpl::QueryInterface( REFIID iid, void **iface )
48           {
49               return controllingUnknown()->QueryInterface( iid, iface );
50           }
51           unsigned long AxImpl::AddRef()
52           {
53               return controllingUnknown()->AddRef();
54           }
55           unsigned long AxImpl::Release()
56           {
57               return controllingUnknown()->Release();
58           }
59
60       The QAXAGG_IUNKNOWN macro expands to the code above, and you can use it
61       in the class declaration of your subclass.
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QObject * QAxAggregated::object () const [protected]

64       Returns a pointer to the QObject subclass implementing the COM object.
65       This function might return 0.
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67       Warning: You must not store the returned pointer, unless you use a
68       QGuardedPtr, since the QObject can be destroyed by ActiveQt at any
69       time.
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long QAxAggregated::queryInterface ( const QUuid & iid, void ** iface ) [pure

72       virtual]
73       Reimplement this pure virtual function to support additional COM
74       interfaces. Set the value of iface to point to this object to support
75       the interface iid. Note that you must cast the this pointer to the
76       appropriate superclass.
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78           long AxImpl::queryInterface( const QUuid &iid, void **iface )
79           {
80               *iface = 0;
81               if ( iid == IID_ISomeCOMInterface )
82                   *iface = (ISomeCOMInterface*)this;
83               else
84                   return E_NOINTERFACE;
85               AddRef();
86               return S_OK;
87           }
88
89       Return the standard COM results S_OK (interface is supported) or
90       E_NOINTERFACE (requested interface is not supported).
91
92       Warning: Even though you must implement the IUnknown interface if you
93       implement any COM interface you must not support the IUnknown interface
94       in your queryInterface() implementation.
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QWidget * QAxAggregated::widget () const [protected]

97       Returns a pointer to the QWidget subclass implementing the ActiveX
98       control. This function might return 0.
99
100       Warning: You must not store the returned pointer, unless you use a
101       QGuardedPtr, since the QWidget can be destroyed by ActiveQt at any
102       time.
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104

SEE ALSO

106       http://doc.trolltech.com/qaxaggregated.html
107       http://www.trolltech.com/faq/tech.html
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110       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
111       license file included in the distribution for a complete license
112       statement.
113

AUTHOR

115       Generated automatically from the source code.
116

BUGS

118       If you find a bug in Qt, please report it as described in
119       http://doc.trolltech.com/bughowto.html.  Good bug reports help us to
120       help you. Thank you.
121
122       The definitive Qt documentation is provided in HTML format; it is
123       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
124       web browser. This man page is provided as a convenience for those users
125       who prefer man pages, although this format is not officially supported
126       by Trolltech.
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128       If you find errors in this manual page, please report them to qt-
129       bugs@trolltech.com.  Please include the name of the manual page
130       (qaxaggregated.3qt) and the Qt version (3.3.8).
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134Trolltech AS                    2 February 2007             QAxAggregated(3qt)
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