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<title>A Qt example as a scriptable ActiveX control (executable)</title>
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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>A Qt example as a scriptable ActiveX control (executable)</h1>
This example shows how to turn an existing Qt application
into an ActiveX control server. The ActiveX control is based
on the Qt tetrix example.
<p> It demonstrates the use of the default factory provied by the
<a href="qaxfactory.html#QAXFACTORY_DEFAULT">QAXFACTORY_DEFAULT</a> macro, and of <a href="qaxfactory.html#isServer">QAxFactory::isServer</a>().
<p> The code changes for the tetrix GUI are minimal (a property <tt>score</tt>,
a signal <tt>gameOver</tt> and a slot <tt>startGame</tt>) and provide a better scripting
interface for the use of the control in a web environment.
<p> The implementation of the ActiveX server functionality is only in the
tetrax.cpp file.
The default implementation of the <a href="qaxfactory.html">QAxFactory</a> is used through the
QAXFACTORY_DEFAULT macro, and exports the QTetrax object specifying
the five unique IDs required by COM to instantiate and communicate with
the server.
<pre> #include "qtetrax.h"
#include "qdragapp.h"
#include "qfont.h"
#include <<a href="qaxfactory-h.html">qaxfactory.h</a>>
QAXFACTORY_DEFAULT( QTetrax,
"{852558AD-CBD6-4f07-844C-D1E8983CD6FC}",
"{2F5D0068-772C-4d1e-BCD2-D3F6BC7FD315}",
"{769F4820-9F28-490f-BA50-5545BD381DCB}",
"{5753B1A8-53B9-4abe-8690-6F14EC5CA8D0}",
"{DE2F7CE3-CFA7-4938-A9FC-867E2FEB63BA}" )
</pre>The <tt>main</tt> entry point method instantiates a <a href="qapplication.html">QApplication</a> object, and
creates the GUI only if the program is not running as an ActiveX server (ie.
the program has been started by the user, not by COM).
<pre> int main( int argc, char **argv )
{
<a name="x2716"></a> QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::CustomColor );
QDragApplication a(argc,argv);
QTetrax *tetrax = 0;
if ( !QAxFactory::isServer() ) {
tetrax = new QTetrax;
<a name="x2718"></a> tetrax-><a href="qwidget.html#setCaption">setCaption</a>("Tetrax");
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(tetrax);
tetrax-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Tetrax");
tetrax-><a href="qwidget.html#show">show</a>();
}
</pre>The server enters the application event loop, and destroys the GUI before exiting.
<pre> int res = a.<a href="qapplication.html#exec">exec</a>();
delete tetrax;
return res;
}
</pre>
<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
<tt>examples/tetrix</tt>.
<p> <hr>
<p> The <a href="qaxserver-demo-tetrax.html">demonstration</a> requires your
Web browser to support ActiveX controls, and scripting to be enabled.
<p>
The "Tetrix" control is embedded using the <tt><object></tt> tag. Note that the
dimensions of the control are provided explicitely, as the control itself
does not use Qt's layout engine.
<pre> <object ID="QTetrax" width=550 height=370
CLASSID="CLSID:852558AD-CBD6-4f07-844C-D1E8983CD6FC"
CODEBASE=http://www.trolltech.com/demos/tetrax.cab>
<PARAM NAME="score" VALUE="0">
[Object not available! Did you forget to build and register the server?]
</object>
</pre>An HTML button is added to start the game.
<pre> <form>
<input type="button" value="Start Game..."
onClick="QTetrax.startGame()">
</form>
</pre>And an event handler for the <tt>gameOver()</tt> event is implemented in JavaScript
to display a simple message box.
<pre> <SCRIPT LANGUAGE=JavaScript>
function QTetrax::gameOver()
{
alert( "GameOver!" );
}
</SCRIPT>
</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
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