void GetScreenInfo(){    QDesktopWidget* desktopWidget = QApplication::desktop();    //获取可用桌面大小    QRect deskRect = desktopWidget->availableGeometry();    int   m_nActScreenX = deskRect.width();    int   m_nActScreenY = deskRect.height();    //获取设备屏幕大小    QRect screenRect = desktopWidget->screenGeometry();//    m_nActScreenX = screenRect.width();//    m_nActScreenY = screenRect.height();    //获取系统设置的屏幕个数（屏幕拷贝方式该值为1）//    int g_nScreenCount = desktopWidget->screenCount();}