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<title>主体很容易</title>
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<h1 align=center>主体很容易</h1>
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<p> （<tt>main.cpp</tt>。）
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<pre> #include <<a href="qapplication-h.html">qapplication.h</a>>
#include "chartform.h"
int main( int argc, char *argv[] )
{
<a href="qapplication.html">QApplication</a> app( argc, argv );
<a href="qstring.html">QString</a> filename;
<a name="x2405"></a> if ( app.<a href="qapplication.html#argc">argc</a>() > 1 ) {
<a name="x2406"></a> filename = app.<a href="qapplication.html#argv">argv</a>()[1];
<a name="x2411"></a> if ( !filename.<a href="qstring.html#endsWith">endsWith</a>( ".cht" ) )
filename = <a href="qstring.html#QString-null">QString::null</a>;
}
ChartForm *cf = new ChartForm( filename );
<a name="x2409"></a> app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( cf );
cf-><a href="qwidget.html#show">show</a>();
<a name="x2408"></a> app.<a href="qobject.html#connect">connect</a>( &app, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), cf, SLOT(fileQuit()) );
<a name="x2407"></a> return app.<a href="qapplication.html#exec">exec</a>();
}
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<p> 我们把main()函数保持得很简单，很小。我们创建一个<a href="qapplication.html">QApplication</a>对象并且传递给它命令行参数。我们也允许用户通过<tt>chart mychart.cht</tt>来调用程序，所以如果他们已经添加了一个文件名，我们就把它传递给构造函数。图表窗口中的大多数行为我们将在下一步进行评论。
<p> <p align=right>
<a href="tutorial2-03.html">« 数据元素</a> |
<a href="tutorial2.html">目录</a> |
<a href="tutorial2-05.html">实现图形用户界面 »</a>
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<td><a href="zh_CN.html">译者:Cavendish</a>
<td align=right><div align=right>Qt 3.0.5版</div>
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