cpp get screen resolution

1#include "wtypes.h"
2#include <iostream>
3using namespace std;
4
5// Get the horizontal and vertical screen sizes in pixel
6void GetDesktopResolution(int& horizontal, int& vertical)
7{
8   RECT desktop;
9   // Get a handle to the desktop window
10   const HWND hDesktop = GetDesktopWindow();
11   // Get the size of screen to the variable desktop
12   GetWindowRect(hDesktop, &desktop);
13   // The top left corner will have coordinates (0,0)
14   // and the bottom right corner will have coordinates
15   // (horizontal, vertical)
16   horizontal = desktop.right;
17   vertical = desktop.bottom;
18}
19
20int main()
21{       
22   int horizontal = 0;
23   int vertical = 0;
24   GetDesktopResolution(horizontal, vertical);
25   cout << horizontal << '\n' << vertical << '\n';
26   return 0;
27}