Qt 获取屏幕信息

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();
}