Linux Get System screen resolution

GetSystemMetrics (Sm_cxscreen) can be used under windows; GetSystemMetrics (Sm_cyscreen) gets.

The xdisplaywidth can be used under Linux,xdisplayheight () gets.
In QT? Online a lot of people say is qapplication::d esktop ()->width (); Qapplication::d esktop ()->height (); This method is of course not a problem for single-monitor mode. But for multiple monitors, especially if you're using an extended desktop, there's a problem. This morning looked carefully at the help of Qdesktopwidget, need to use Qapplication::d esktop ()->screengeometry (); This function has several overloaded versions, meaning the same. The function returns a Qrect, and the width and height of the qrect is the resolution of the screen.

Linux Get System screen resolution