Qt中如何启动其他应用程序（QProcess）

 QPushButton *push_button  = new QPushButton(this);
 connect(push_button, SIGNAL(clicked()), this, SLOT(startProcess()));
 process = new QProcess();
 QObject::connect(process, SIGNAL(error(QProcess::ProcessError)), this, SLOT(processError (QProcess::ProcessError)));


 QPushButton *push_button  = new QPushButton(th