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207 lines
9.0 KiB
207 lines
9.0 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/examples/opengl/opengl.doc:33 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Qt' OpenGL widgets as an ActiveX (executable)</title>
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<style type="text/css"><!--
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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</td>
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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>Qt' OpenGL widgets as an ActiveX (executable)</h1>
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The ActiveX control in this example uses the QGlWidget class in
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Qt to render an OpenGL scene in an ActiveX. The control exposes a few
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methods to change the scene. The example is based on the
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<a href="opengl-box-example.html">"box" example</a> from the standard
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Qt distribution.
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<p> The example demonstrates the use of the default factory and
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<a href="qaxfactory.html#isServer">QAxFactory::isServer</a>(), and the implementation of an additional COM
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interface using <a href="qaxbindable.html">QAxBindable</a> and <a href="qaxaggregated.html">QAxAggregated</a>. The server executable
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can run both as an ActiveX server and as a stand alone application.
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<p>
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The application uses the default factory as provided by the
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<a href="qaxfactory.html#QAXFACTORY_DEFAULT">QAXFACTORY_DEFAULT</a> macro to expose the <tt>GLBox</tt> widget as an ActiveX
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control.
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<pre> #include <<a href="qaxfactory-h.html">qaxfactory.h</a>>
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QAXFACTORY_DEFAULT( GLBox,
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"{5fd9c22e-ed45-43fa-ba13-1530bb6b03e0}",
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"{33b051af-bb25-47cf-a390-5cfd2987d26a}",
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"{8c996c29-eafa-46ac-a6f9-901951e765b5}",
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"{2c3c183a-eeda-41a4-896e-3d9c12c3577d}",
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"{83e16271-6480-45d5-aaf1-3f40b7661ae4}"
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)
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</pre>The implementation of <tt>main</tt> initializes the <a href="qapplication.html">QApplication</a> object,
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and uses <a href="qaxfactory.html#isServer">QAxFactory::isServer</a>() to determine whether or not it is
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appropriate to create and show the application interface.
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<pre> /*
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The main program is here.
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*/
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int main( int argc, char **argv )
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{
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<a name="x2732"></a> QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::CustomColor );
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<a href="qapplication.html">QApplication</a> a(argc,argv);
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if ( !QGLFormat::hasOpenGL() ) {
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<a href="qapplication.html#qWarning">qWarning</a>( "This system has no OpenGL support. Exiting." );
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return -1;
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}
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if ( !QAxFactory::isServer() ) {
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GLObjectWindow w;
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w.<a href="qwidget.html#resize">resize</a>( 400, 350 );
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<a name="x2733"></a> a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &w );
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w.<a href="qwidget.html#show">show</a>();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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<a name="x2731"></a> return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p>
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The <tt>GLBox</tt> class inherits from both the <a href="qglwidget.html">QGLWidget</a> class to be able
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to render OpenGL, and from <a href="qaxbindable.html">QAxBindable</a>.
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<pre> #include <<a href="qaxbindable-h.html">qaxbindable.h</a>>
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class GLBox : public <a href="qglwidget.html">QGLWidget</a>,
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public QAxBindable
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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</pre>The class reimplements the <a href="qaxbindable.html#createAggregate">QAxBindable::createAggregate</a>() function from <a href="qaxbindable.html">QAxBindable</a>
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to return the pointer to a <a href="qaxaggregated.html">QAxAggregated</a> object.
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<pre> public:
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GLBox( <a href="qwidget.html">QWidget</a>* parent, const char* name );
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~GLBox();
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<a href="qaxaggregated.html">QAxAggregated</a> *createAggregate();
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public slots:
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void setXRotation( int degrees );
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</pre>The rest of the class declaration and the implementation of the OpenGL
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rendering is identical to the original "box" example.
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<p>
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The implementation file of the <tt>GLBox</tt> class includes the <tt>objsafe.h</tt>
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system header, in which the <tt>IObjectSafety</tt> COM interface is defined.
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<pre> #include <objsafe.h>
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</pre>A class <tt>ObjectSafetyImpl</tt> is declared using multiple inheritance
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to subclass the <a href="qaxaggregated.html">QAxAggregated</a> class, and to implement the IObjectSafety
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interface.
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<pre> class ObjectSafetyImpl : public <a href="qaxaggregated.html">QAxAggregated</a>,
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public IObjectSafety
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{
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public:
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</pre>The class declares a default constructor, and implements the queryInterface
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function to support the IObjectSafety interface.
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<pre> ObjectSafetyImpl() {}
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long queryInterface( const <a href="quuid.html">QUuid</a> &iid, void **iface )
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{
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*iface = 0;
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if ( iid == IID_IObjectSafety )
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*iface = (IObjectSafety*)this;
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else
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return E_NOINTERFACE;
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AddRef();
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return S_OK;
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}
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</pre>Since every COM interface inherits <tt>IUnknown</tt> the <tt>QAXAGG_IUNKNOWN</tt> macro
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is used to provide the default implementation of the <tt>IUnknown</tt> interface.
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The macro is defined to delegate all calls to <tt>QueryInterface</tt>, <tt>AddRef</tt>
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and <tt>Release</tt> to the interface returned by the controllingUnknown() function.
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<pre> QAXAGG_IUNKNOWN;
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</pre>The implementation of the <tt>IObjectSafety</tt> interface provides the caller
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with information about supported and enabled safety options, and returns
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<tt>S_OK</tt> for all calls to indicate that the ActiveX control is safe.
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<pre> HRESULT WINAPI GetInterfaceSafetyOptions( REFIID riid, DWORD *pdwSupportedOptions, DWORD *pdwEnabledOptions )
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{
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*pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
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*pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
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return S_OK;
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}
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HRESULT WINAPI SetInterfaceSafetyOptions( REFIID riid, DWORD pdwSupportedOptions, DWORD pdwEnabledOptions )
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{
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return S_OK;
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}
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};
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</pre>The implementation of the <tt>createAggregate()</tt> function just returns a new
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<tt>ObjectSafetyImpl</tt> object.
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<pre> QAxAggregated *GLBox::createAggregate()
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{
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return new ObjectSafetyImpl();
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}
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</pre>
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<p> To build the example you must first build the <a href="qaxserver.html">QAxServer</a> library. Then run qmake and your make tool in
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<tt>examples/wrapper</tt>.
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<p> <hr>
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<p> The <a href="qaxserver-demo-opengl.html">demonstration</a> requires your
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WebBrowser to support ActiveX controls, and scripting to be enabled.
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<p> In contrast to the other QAxServer examples Internet Explorer will not
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open a dialog box to ask the user whether or not the scripting of the GLBox
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control should be allowed (the exact browser behaviour depends on the security
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settings in the Internet Options dialog).
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<p>
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<pre> <SCRIPT LANGUAGE=JavaScript>
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function setRot( form )
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{
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GLBox.setXRotation( form.XEdit.value );
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GLBox.setYRotation( form.YEdit.value );
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GLBox.setZRotation( form.ZEdit.value );
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}
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</SCRIPT>
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<p>
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An OpenGL scene:<br>
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<object ID="GLBox" CLASSID="CLSID:5fd9c22e-ed45-43fa-ba13-1530bb6b03e0"
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CODEBASE=http://www.trolltech.com/demos/openglax.cab>
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[Object not available! Did you forget to build and register the server?]
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</object><br>
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<form>
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Rotate the scene:<br>
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X:<input type="edit" ID="XEdit" value="0"><br>
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Y:<input type="edit" name="YEdit" value="0"><br>
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Z:<input type="edit" name="ZEdit" value="0"><br>
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<input type="button" value="Set" onClick="setRot(this.form)">
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</form>
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</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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