Qt获取屏幕分辨率

QDesktopWidget* desktopWidget = QApplication::desktop();
//获取可用桌面大小
QRect deskRect = desktopWidget->availableGeometry();
//获取设备屏幕大小
QRect screenRect = desktopWidget->screenGeometry();
return deskRect;

//QRect类的使用
QRect deskRect;
int g_nActScreenX = deskRect.width();
int g_nActScreenY = deskRect.height();
//  QRect rec;
//  rec.setX(g_nActScreenX);
//  rec.setY(g_nActScreenY);