C++ Getting window width and height using GetClientRect

get_window_width_height.cpp

// Below is an example of getting Assault Cube game window width and height

#include <Windows.h>

// ClassName and WindowName of FindWindow() are generated by X-Spy tool: http://www.x-spy.net/
hwndAC = FindWindow(L"SDL_app", L"AssaultCube");
if (hwndAC) // >0 is a valid HWND
{
	RECT rctAC;
	if (GetClientRect(hwndAC, &rctAC))
	{
		// rctAC will receives the client coordinates. The left and top members are zero.
		// The right and bottom members contain the width and height of the window.
		std::cout << std::dec << "Width " << rctAC.right << ", Height " << rctAC.bottom << '\n';	
	}
	else
	{
		std::cout << "<GetClientRect> Error " << GetLastError() << '\n';
	}
}
else
{
	std::cout << "<FindWindow> Error " << GetLastError() << '\n';
}