How detect current screen resolution?

Question

How do I from Winapi (in C or C++) detect the current screen resolution?

Some background:

I want to start a new OpenGL fullscreen window, but want it open wi

Answer 1

Deleted about a week ago, then edited 3-4-13.

Here's a good one for situations where the user has decided to run their desktop in a lower resolution (bad idea) or corner cases where a person decided to get a monitor that their graphics controller couldn't take full advantage of:

// get actual size of desktop
RECT actualDesktop;
GetWindowRect(GetDesktopWindow(), &actualDesktop);