Qt: 执行cmd命令;

    QProcess p(NULL);
    p.setWorkingDirectory(szAppPath+"/database");           //指定工做路径,这个地方必定要设置;
    p.start(szCmd);                        //开进程执行命令;
    while(p.state() != QProcess::NotRunning)                    //延时;
    {
        QTime delayTime = QTime::currentTime().addMSecs(100);
        while( QTime::currentTime() < delayTime)
           QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
    }            
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