tutorial2-04.html
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><meta name="Translator" content="Cavendish"><meta name="Qt zh_CN Documents Website" content="http://www.qiliang.net/qt"><title>主体很容易</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; font-family: "Times New Roman" }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">主页</font></a> | <a href="classes.html"><font color="#004faf">所有的类</font></a> | <a href="mainclasses.html"><font color="#004faf">主要的类</font></a> | <a href="annotated.html"><font color="#004faf">注释的类</font></a> | <a href="groups.html"><font color="#004faf">分组的类</font></a> | <a href="functions.html"><font color="#004faf">函数</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>主体很容易</h1><p> <p> （<tt>main.cpp</tt>。）<p> <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>(); }</pre><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></p><p> <!-- eof --><p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td><a href="zh_CN.html">译者:Cavendish</a><td align=right><div align=right>Qt 3.0.5版</div></table></div></address></body></html>⌨️ 快捷键说明
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