CODE:

#include 
#include 

void OnDestroy(HWND hWnd);
LRESULT CALLBACK WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam){
	switch(msg){
		HANDLE_MSG(hWnd, WM_DESTROY, OnDestroy);
	default:
        return DefWindowProc(hWnd, msg, wParam, lParam);
     }
	return 0L;
}

void OnDestroy(HWND hWnd) {
	PostQuitMessage(0);
}