| [190] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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| 2 | <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial2.doc:322 -->
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 30 | <font color="#004faf">Functions</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>Mainly Easy</h1>
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| 33 |
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| 34 |
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| 35 | <p>
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| 36 | <p> (<tt>main.cpp</tt>.)
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| 37 | <p>
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| 38 |
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| 39 | <pre> #include <<a href="qapplication-h.html">qapplication.h</a>>
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| 40 | #include "chartform.h"
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| 41 |
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| 42 | int main( int argc, char *argv[] )
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| 43 | {
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| 44 | <a href="qapplication.html">QApplication</a> app( argc, argv );
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| 45 |
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| 46 | <a href="qstring.html">QString</a> filename;
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| 47 | <a name="x2557"></a> if ( app.<a href="qapplication.html#argc">argc</a>() > 1 ) {
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| 48 | <a name="x2558"></a> filename = app.<a href="qapplication.html#argv">argv</a>()[1];
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| 49 | <a name="x2561"></a> if ( !filename.<a href="qstring.html#endsWith">endsWith</a>( ".cht" ) )
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| 50 | filename = <a href="qstring.html#QString-null">QString::null</a>;
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| 51 | }
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| 52 |
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| 53 | ChartForm *cf = new ChartForm( filename );
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| 54 | <a name="x2560"></a> app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( cf );
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| 55 | cf-><a href="qwidget.html#show">show</a>();
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| 56 |
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| 57 | return app.<a href="qapplication.html#exec">exec</a>();
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| 58 | }
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| 59 | </pre>
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| 60 | <p> We have kept the main() function simple and small. We create a
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| 61 | <a href="qapplication.html">QApplication</a> object and pass it the command line arguments. We are
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| 62 | allowing users to invoke the program with <tt>chart mychart.cht</tt>, so if
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| 63 | they've added a filename we pass that through to the chart form
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| 64 | constructor. Most of the action takes place within the chart form
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| 65 | which we'll review next.
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| 66 | <p> <p align="right">
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| 67 | <a href="tutorial2-03.html">« Data Elements</a> |
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| 68 | <a href="tutorial2.html">Contents</a> |
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| 69 | <a href="tutorial2-05.html">Presenting the GUI »</a>
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| 70 | </p>
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| 71 | <p>
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| 72 | <!-- eof -->
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| 73 | <p><address><hr><div align=center>
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| 74 | <table width=100% cellspacing=0 border=0><tr>
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| 75 | <td>Copyright © 2007
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| 76 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 77 | <td align=right><div align=right>Qt 3.3.8</div>
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| 78 | </table></div></address></body>
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| 79 | </html>
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