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80 lines
3.0 KiB
80 lines
3.0 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial2.doc:322 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Mainly Easy</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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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>Mainly Easy</h1>
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<p>
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<p> (<tt>main.cpp</tt>.)
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<p>
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<pre> #include <<a href="qapplication-h.html">qapplication.h</a>>
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#include "chartform.h"
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int main( int argc, char *argv[] )
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{
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<a href="qapplication.html">QApplication</a> app( argc, argv );
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<a href="qstring.html">QString</a> filename;
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<a name="x2557"></a> if ( app.<a href="qapplication.html#argc">argc</a>() > 1 ) {
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<a name="x2558"></a> filename = app.<a href="qapplication.html#argv">argv</a>()[1];
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<a name="x2561"></a> if ( !filename.<a href="qstring.html#endsWith">endsWith</a>( ".cht" ) )
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filename = <a href="qstring.html#QString-null">QString::null</a>;
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}
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ChartForm *cf = new ChartForm( filename );
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<a name="x2560"></a> app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( cf );
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cf-><a href="qwidget.html#show">show</a>();
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return app.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p> We have kept the main() function simple and small. We create a
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<a href="qapplication.html">QApplication</a> object and pass it the command line arguments. We are
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allowing users to invoke the program with <tt>chart mychart.cht</tt>, so if
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they've added a filename we pass that through to the chart form
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constructor. Most of the action takes place within the chart form
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which we'll review next.
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<p> <p align="right">
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<a href="tutorial2-03.html">« Data Elements</a> |
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<a href="tutorial2.html">Contents</a> |
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<a href="tutorial2-05.html">Presenting the GUI »</a>
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</p>
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<p>
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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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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</table></div></address></body>
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</html>
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