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| 6 | <title>Running Qt/Embedded applications</title>
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| 20 | <font color="#004faf">Home</font></a>
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 31 | </td>
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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>Running Qt/Embedded applications</h1>
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| 33 |
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| 34 |
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| 35 | <p> A Qt/Embedded application requires a master application to be running
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| 36 | or to be a master application itself. The master application is
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| 37 | primarily responsible for managing top-level window regions, and
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| 38 | pointer and keyboard input.
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| 39 | <p> Any Qt/Embedded application can be a master application by
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| 40 | constructing the <a href="qapplication.html">QApplication</a> object with the
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| 41 | <em>QApplication::GuiServer</em> type, or by being run with the <em>-qws</em>
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| 42 | command line option.
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| 43 | <p> This document assumes you have the Linux framebuffer configured correctly
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| 44 | and no master process is running. If you do not have a working Linux
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| 45 | framebuffer you can use the
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| 46 | <a href="emb-qvfb.html">Qt/Embedded virtual framebuffer</a>, or you can
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| 47 | run Qt/Embedded as a <a href="emb-vnc.html">VNC server</a>.
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| 48 | <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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| 49 | installed Qt/Embedded and add the $QTDIR/lib directory to
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| 50 | $LD_LIBRARY_PATH, e.g.:
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| 51 | <pre>
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| 52 | export QTDIR=$HOME/qt-VERSION
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| 53 | export LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
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| 54 | </pre>
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| 55 |
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| 56 | <p> Run the application with the <em>-qws</em> option:
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| 57 | <p> <pre>
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| 58 | cd $QTDIR/examples/widgets
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| 59 | ./widgets -qws
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| 60 | </pre>
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| 61 |
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| 62 | <p> You should see the <tt>widgets</tt> example appear. If your mouse doesn't
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| 63 | work correctly you must specify the type of mouse to use. You can
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| 64 | exit the master application at any time using
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| 65 | <b>Ctrl+Alt+Backspace</b>.
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| 66 | <p> If you wish to run additional applications you should run them as clients
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| 67 | i.e. without the <em>-qws</em> option.
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| 68 | <p> <h2> Displays
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| 69 | </h2>
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| 70 | <a name="1"></a><p> Qt/Embedded allows multiple displays to be used simultaneously by running
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| 71 | multiple Qt/Embedded master processes. This is achieved using the -display
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| 72 | command line parameter or the $QWS_DISPLAY environment variable.
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| 73 | <p> The -display parameter's syntax is:
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| 74 | <pre>
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| 75 | [gfx driver][:driver specific options][:display number]
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| 76 | </pre>
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| 77 |
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| 78 | For example, if you want to use the mach64 driver on fb1 as display 2:
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| 79 | <pre>
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| 80 | $ ./launcher -display Mach64:/dev/fb1:2
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| 81 | </pre>
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| 82 |
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| 83 | <p> To try this functionality you can do the following:
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| 84 | <ol type=1>
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| 85 | <li> Change to VC 1 (virtual console one) and run the launcher:
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| 86 | <p> <pre>
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| 87 | $ cd examples/launcher
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| 88 | $ ./launcher
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| 89 | </pre>
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| 90 |
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| 91 | <p> <li> Switch to VC 2 and run another one:
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| 92 | <p> <pre>
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| 93 | $ cd examples/launcher
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| 94 | $ ./launcher -display :1
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| 95 | </pre>
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| 96 |
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| 97 | <p> Another launcher will be started. Start an application in this launcher.
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| 98 | <p> <li> Press <b>Ctrl+Alt+F1</b> - back to display 0. You can also start
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| 99 | additional applications on a particular display by specifying the
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| 100 | display id. Change to VC 3:
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| 101 | <p> <pre>
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| 102 | $ cd examples/widgets
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| 103 | $ ./widgets -display :1
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| 104 | </pre>
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| 105 |
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| 106 | <p> will display the widgets example on dislpay :1 (VC 2).
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| 107 | </ol>
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| 108 | <p> Only the master process needs to specify the driver/device part
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| 109 | explicitly. The clients get the information they need from the master
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| 110 | when they connect. So once you have a master server running using a
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| 111 | particular driver, you can just use "client -display :n" to use
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| 112 | display n.
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| 113 | <p> <h2> Mouse Input
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| 114 | </h2>
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| 115 | <a name="2"></a><p> Qt/Embedded attempts to autodetect a mouse by default. The supported
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| 116 | protocols are MouseMan, Microsoft, IntelliMouse and
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| 117 | some other devices specific to certain hardware (e.g. Vr touch panel).
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| 118 | To specify the mouse to use set the <tt>$QWS_MOUSE_PROTO</tt> environment
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| 119 | variable, e.g.:
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| 120 | <pre>
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| 121 | export QWS_MOUSE_PROTO=IntelliMouse
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| 122 | </pre>
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| 123 |
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| 124 | <p> The mouse autodetection opens the serial devices and psaux which
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| 125 | may cause conflicts with other programs using those devices. If
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| 126 | this is the case then specify the mouse driver protocol and device
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| 127 | explicitly.
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| 128 | <p> <p>See also <a href="emb-pointer.html">Qt/Embedded Pointer Handling</a>.
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| 129 |
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| 130 | <p>
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| 131 | <!-- eof -->
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| 132 | <p><address><hr><div align=center>
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| 133 | <table width=100% cellspacing=0 border=0><tr>
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| 134 | <td>Copyright © 2007
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| 135 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 136 | <td align=right><div align=right>Qt 3.3.8</div>
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| 137 | </table></div></address></body>
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