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<title>Running Qt/Embedded applications</title>
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<font color="#004faf">Home</font></a>
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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>Running Qt/Embedded applications</h1>
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<p> A Qt/Embedded application requires a master application to be running
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or to be a master application itself. The master application is
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primarily responsible for managing top-level window regions, and
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pointer and keyboard input.
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<p> Any Qt/Embedded application can be a master application by
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constructing the <a href="qapplication.html">QApplication</a> object with the
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<em>QApplication::GuiServer</em> type, or by being run with the <em>-qws</em>
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command line option.
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<p> This document assumes you have the Linux framebuffer configured correctly
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and no master process is running. If you do not have a working Linux
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framebuffer you can use the
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<a href="emb-qvfb.html">Qt/Embedded virtual framebuffer</a>, or you can
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run Qt/Embedded as a <a href="emb-vnc.html">VNC server</a>.
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<p> Change to a Linux console and select an example to run, e.g. <tt>examples/widgets</tt>. Make sure $QTDIR is set to the directory where you
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installed Qt/Embedded and add the $QTDIR/lib directory to
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$LD_LIBRARY_PATH, e.g.:
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<pre>
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export QTDIR=$HOME/qt-VERSION
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export LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
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</pre>
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<p> Run the application with the <em>-qws</em> option:
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<p> <pre>
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cd $QTDIR/examples/widgets
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./widgets -qws
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</pre>
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<p> You should see the <tt>widgets</tt> example appear. If your mouse doesn't
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work correctly you must specify the type of mouse to use. You can
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exit the master application at any time using
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<b>Ctrl+Alt+Backspace</b>.
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<p> If you wish to run additional applications you should run them as clients
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i.e. without the <em>-qws</em> option.
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<p> <h2> Displays
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</h2>
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<a name="1"></a><p> Qt/Embedded allows multiple displays to be used simultaneously by running
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multiple Qt/Embedded master processes. This is achieved using the -display
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command line parameter or the $QWS_DISPLAY environment variable.
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<p> The -display parameter's syntax is:
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<pre>
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[gfx driver][:driver specific options][:display number]
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</pre>
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For example, if you want to use the mach64 driver on fb1 as display 2:
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<pre>
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$ ./launcher -display Mach64:/dev/fb1:2
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</pre>
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<p> To try this functionality you can do the following:
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<ol type=1>
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<li> Change to VC 1 (virtual console one) and run the launcher:
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<p> <pre>
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$ cd examples/launcher
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$ ./launcher
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</pre>
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<p> <li> Switch to VC 2 and run another one:
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<p> <pre>
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$ cd examples/launcher
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$ ./launcher -display :1
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</pre>
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<p> Another launcher will be started. Start an application in this launcher.
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<p> <li> Press <b>Ctrl+Alt+F1</b> - back to display 0. You can also start
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additional applications on a particular display by specifying the
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display id. Change to VC 3:
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<p> <pre>
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$ cd examples/widgets
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$ ./widgets -display :1
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</pre>
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<p> will display the widgets example on dislpay :1 (VC 2).
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</ol>
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<p> Only the master process needs to specify the driver/device part
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explicitly. The clients get the information they need from the master
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when they connect. So once you have a master server running using a
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particular driver, you can just use "client -display :n" to use
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display n.
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<p> <h2> Mouse Input
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</h2>
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<a name="2"></a><p> Qt/Embedded attempts to autodetect a mouse by default. The supported
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protocols are MouseMan, Microsoft, IntelliMouse and
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some other devices specific to certain hardware (e.g. Vr touch panel).
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To specify the mouse to use set the <tt>$QWS_MOUSE_PROTO</tt> environment
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variable, e.g.:
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<pre>
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export QWS_MOUSE_PROTO=IntelliMouse
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</pre>
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<p> The mouse autodetection opens the serial devices and psaux which
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may cause conflicts with other programs using those devices. If
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this is the case then specify the mouse driver protocol and device
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explicitly.
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<p> <p>See also <a href="emb-pointer.html">Qt/Embedded Pointer Handling</a>.
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<p>
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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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