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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>Porting your applications to Qt/Embedded</h1>
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| 33 |
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| 34 |
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| 35 | <p> Existing Qt applications should require no porting provided there is no
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| 36 | platform dependent code. Platform dependent code includes system calls,
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| 37 | calls to the underlying window system (Windows or X11), and Qt platform
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| 38 | specific methods such as <a href="qapplication.html#x11EventFilter">QApplication::x11EventFilter</a>().
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| 39 | <p> For cases where it is necessary to use platform dependent code there are
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| 40 | macros defined that can be used to enable/disable code for each platform
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| 41 | using <tt>#ifdef</tt> directives:
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| 42 | <p> <center><table cellpadding="4" cellspacing="2" border="0">
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| 43 | <tr bgcolor="#a2c511"> <th valign="top">Platform <th valign="top">Macro
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| 44 | <tr bgcolor="#f0f0f0"> <td valign="top">Qt/X11 <td valign="top">Q_WS_X11
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| 45 | <tr bgcolor="#d0d0d0"> <td valign="top">Qt/Windows <td valign="top">Q_WS_WIN
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| 46 | <tr bgcolor="#f0f0f0"> <td valign="top">Qt/Embedded <td valign="top">Q_WS_QWS
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| 47 | </table></center>
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| 48 | <p> Qt/Embedded also requires the following flags to be defined when compiling
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| 49 | applications:
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| 50 | <pre>
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| 51 | -DQWS -fno-exceptions -fno-rtti
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| 52 | </pre>
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| 53 |
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| 54 | <p> Exceptions and RTTI are disabled in Qt/Embedded because they incur a large
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| 55 | overhead in both size and speed.
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| 56 |
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| 57 | <!-- eof -->
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| 58 | <p><address><hr><div align=center>
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| 60 | <td>Copyright © 2007
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| 61 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 62 | <td align=right><div align=right>Qt 3.3.8</div>
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| 63 | </table></div></address></body>
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