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| 32 | <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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| 33 |
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| 34 | <p>The QAxAggregated class is an abstract base class for implementations of
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| 35 | additional COM interfaces.
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| 36 | <a href="#details">More...</a>
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| 37 | <p>This class is part of the <b>Qt ActiveQt Extension</b>.
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| 38 | <p><tt>#include <<a href="qaxbindable-h.html">qaxbindable.h</a>></tt>
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| 39 | <p><a href="qaxaggregated-members.html">List of all member functions.</a>
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| 40 | <h2>Public Members</h2>
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| 41 | <ul>
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| 42 | <li class=fn>virtual long <a href="#queryInterface"><b>queryInterface</b></a> ( const QUuid & iid, void ** iface ) = 0</li>
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| 43 | </ul>
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| 44 | <h2>Protected Members</h2>
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| 45 | <ul>
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| 46 | <li class=fn>IUnknown * <a href="#controllingUnknown"><b>controllingUnknown</b></a> () const</li>
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| 47 | <li class=fn>QWidget * <a href="#widget"><b>widget</b></a> () const</li>
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| 48 | <li class=fn>QObject * <a href="#object"><b>object</b></a> () const</li>
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| 49 | </ul>
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| 50 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 51 | <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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| 52 | <p>
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| 53 |
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| 54 | The QAxAggregated class is an abstract base class for implementations of
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| 55 | additional COM interfaces.
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| 56 |
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| 57 | <p>
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| 58 |
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| 59 | <p> Create a subclass of QAxAggregated and reimplement
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| 60 | <a href="#queryInterface">queryInterface</a>() to support additional COM interfaces. Use
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| 61 | multiple inheritance from those COM interfaces. Implement the
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| 62 | IUnknown interface of those COM interfaces by delegating the calls
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| 63 | to QueryInterface(), AddRef() and Release() to the interface
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| 64 | provided by <a href="#controllingUnknown">controllingUnknown</a>().
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| 65 | <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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| 66 | implementing the ActiveX control. You must not store that pointer
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| 67 | in your subclass (unless you use <a href="qguardedptr.html">QGuardedPtr</a>), as the QWidget can
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| 68 | be destroyed by the ActiveQt framework at any time.
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| 69 |
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| 70 | <hr><h2>Member Function Documentation</h2>
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| 71 | <h3 class=fn>IUnknown * <a name="controllingUnknown"></a>QAxAggregated::controllingUnknown () const<tt> [protected]</tt>
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| 72 | </h3>
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| 73 |
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| 74 | <p> Returns the IUnknown interface of the ActiveX control. Implement
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| 75 | the IUnknown interface in your QAxAggregated subclass to delegate
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| 76 | calls to QueryInterface(), AddRef() and Release() to the interface
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| 77 | provided by this function.
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| 78 | <p> <pre>
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| 79 | HRESULT AxImpl::QueryInterface( REFIID iid, void **iface )
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| 80 | {
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| 81 | return controllingUnknown()->QueryInterface( iid, iface );
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| 82 | }
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| 83 |
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| 84 | unsigned long AxImpl::AddRef()
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| 85 | {
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| 86 | return controllingUnknown()->AddRef();
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| 87 | }
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| 88 |
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| 89 | unsigned long AxImpl::Release()
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| 90 | {
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| 91 | return controllingUnknown()->Release();
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| 92 | }
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| 93 | </pre>
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| 94 |
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| 95 | <p> The QAXAGG_IUNKNOWN macro expands to the code above, and you can
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| 96 | use it in the class declaration of your subclass.
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| 97 |
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| 98 | <h3 class=fn><a href="qobject.html">QObject</a> * <a name="object"></a>QAxAggregated::object () const<tt> [protected]</tt>
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| 99 | </h3>
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| 100 |
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| 101 | <p> Returns a pointer to the <a href="qobject.html">QObject</a> subclass implementing the COM object.
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| 102 | This function might return 0.
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| 103 | <p> <b>Warning:</b>
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| 104 | You must not store the returned pointer, unless you use a
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| 105 | <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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| 106 | time.
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| 107 |
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| 108 | <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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| 109 | </h3>
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| 110 |
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| 111 | <p> Reimplement this pure virtual function to support additional COM
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| 112 | interfaces. Set the value of <em>iface</em> to point to this object to
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| 113 | support the interface <em>iid</em>. Note that you must cast the <tt>this</tt> pointer to the appropriate superclass.
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| 114 | <p> <pre>
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| 115 | long AxImpl::queryInterface( const <a href="quuid.html">QUuid</a> &iid, void **iface )
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| 116 | {
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| 117 | *iface = 0;
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| 118 | if ( iid == IID_ISomeCOMInterface )
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| 119 | *iface = (ISomeCOMInterface*)this;
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| 120 | else
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| 121 | return E_NOINTERFACE;
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| 122 |
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| 123 | AddRef();
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| 124 | return S_OK;
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| 125 | }
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| 126 | </pre>
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| 127 |
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| 128 | <p> Return the standard COM results S_OK (interface is supported) or
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| 129 | E_NOINTERFACE (requested interface is not supported).
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| 130 | <p> <b>Warning:</b>
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| 131 | Even though you must implement the IUnknown interface if you
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| 132 | implement any COM interface you must not support the IUnknown
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| 133 | interface in your <a href="#queryInterface">queryInterface</a>() implementation.
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| 134 |
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| 135 | <h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="widget"></a>QAxAggregated::widget () const<tt> [protected]</tt>
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| 136 | </h3>
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| 137 |
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| 138 | <p> Returns a pointer to the <a href="qwidget.html">QWidget</a> subclass implementing the ActiveX control.
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| 139 | This function might return 0.
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| 140 | <p> <b>Warning:</b>
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| 141 | You must not store the returned pointer, unless you use a
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| 142 | <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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| 143 | time.
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| 144 |
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| 145 | <!-- eof -->
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| 146 | <hr><p>
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| 147 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 148 | Copyright © 1995-2007
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| 149 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 150 | <table width=100% cellspacing=0 border=0><tr>
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| 151 | <td>Copyright © 2007
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| 152 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 153 | <td align=right><div align=right>Qt 3.3.8</div>
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| 154 | </table></div></address></body>
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| 155 | </html>
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