И така "взимаме" текущата резолюция

#include "wtypes.h"
#include "iostream"
using namespace std;
void GetDesktopResolution(int& horizontal, int& vertical) {
   RECT desktop;
   const HWND hDesktop = GetDesktopWindow();
   GetWindowRect(hDesktop, &desktop);
   horizontal = desktop.right;
   vertical = desktop.bottom;
}