Waiting for PrintScreen to be pressed

I've tested using MSDN but I haven't had any luck there.

What I want to do is to wait for the PrintScreen button( on the
keyboard ) to be pressed and then do something.

And I want to do this without eating all the CPU power I can get.

I've so far been succesfull with stopping the program with this code
chunk :

Code:

#include <windows.h>

int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
   WaitForSingleObject( GetCurrentProcess() , INFINITE );
   return 0;

}

But now I also want to continuesly check if the button has been
pressed.

I heard from someone that I should use the following functions :

CreateThread
WaitForMultipleObjects

SetWindowsHookEx (where I should use a keyboard hook)

but i don't know how to implement this.

do some reading on using SetWindowsHookEx and installing a keyboard hook, there are some good articles on doing stuff like this on codeproject.com, you will need to create a DLL that contains the hook routine and then an exe to start it all off.