<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/examples/tetrax/tetrax.doc:27 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>A Qt example as a scriptable ActiveX control (executable)</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <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>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>Qt 3.3.8</div> </table></div></address></body> </html>