Getting the mouse cursor position no matter what

I'm trying to find the current cursor position no matter what focus, hitting or visibility the control has.

Could someone show me the correct method, this is what I am doing now and it will work with my window border size and in windowed mode only. I'm sure there is a stupid simple way to make this happen and I'm just not finding it.

Thanks, Chris

GuiCanvas *pRoot = getRoot();
	PlatformWindow* pWindow = pRoot->getPlatformWindow();

	Point2I CursorPos;
	Point2I WindowPos;
	pWindow->getCursorPosition(CursorPos);
	WindowPos = pWindow->getPosition();

	CursorPos -= WindowPos;
	CursorPos -= Point2I(6, 28);