Change Display Settings issues

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C++

MFC

DLL

I'm trying to make a DLL in c++ for GameMaker, it needs to change the display resolution. I'm clueless on how to do it the only way I know of is that it involves ChangeDisplaySettings() and EnumDisplaySettings() functions and the use of a structure known as DevMode. May someone please provide a working, errorless, code snippet as an example on how to do what I'm looking for? In case you are wondering I mainly work with window manipulation, so this is a big task for me to figure out via trial and error, as it is something I've never worked with.

An exported function like this would be nice:

#include "stdafx.h"
#include "mainheaderfile.h"
//any needed includes or imports here please and thank you. :)
#define DLL extern "C" _declspec(dllexport)

DLL double ChangeDisplayResolution(int width, int height)
{
//your code snippet here please and thank you. :)
return 0;
}

Thanks!
TKG