单双屏显示

int main(int argc, char *argv[])
{QApplication a(argc, argv);//获取某个环境变量的值QString path = QProcessEnvironment::systemEnvironment().value("QT_DATA_PATH").replace("\\","/");//获取屏幕大小QDesktopWidget * deskWgt = QApplication::desktop();QRect applicationRect = deskWgt->screenGeometry();  //带任务栏QRect screenRect = deskWgt->availableGeometry();   //不带任务栏MainScreen mm;    //主屏SecondScreen ss;  //副屏幕QDesktopWidget * desktop = QApplication::desktop();int count = desktop->screenCount();if(count > 1){QRect mainRect = desktop->screenGeometry(0);mm.setGeometry(mainRect);mm.showFullScreen();QRect secondRect = desktop->screenGeometry(1);ss.setGeometry(secondRect);ss.showFullScreen();}else{mm.showFullScreen();ss.showFullScreen();}return a.exec();
}

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