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<p> 
<p> (<tt>main.cpp</tt>.)
<p> 

<pre>    #include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
    #include "chartform.h"

    int main( int argc, char *argv[] )
    {
        <a href="qapplication.html">QApplication</a> app( argc, argv );

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    <a name="x2557"></a>    if ( app.<a href="qapplication.html#argc">argc</a>() &gt; 1 ) {
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                filename = <a href="qstring.html#QString-null">QString::null</a>;
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        ChartForm *cf = new ChartForm( filename );
    <a name="x2560"></a>    app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( cf );
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</pre>
<p> We have kept the main() function simple and small. We create a
<a href="qapplication.html">QApplication</a> object and pass it the command line arguments. We are
allowing users to invoke the program with <tt>chart mychart.cht</tt>, so if
they've added a filename we pass that through to the chart form
constructor. Most of the action takes place within the chart form
which we'll review next.
<p> <p align="right">
<a href="tutorial2-03.html">&laquo; Data Elements</a> |
<a href="tutorial2.html">Contents</a> |
<a href="tutorial2-05.html">Presenting the GUI &raquo;</a>
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