How do I programmatically detect returning from screen blanking

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C++

screen

I would like to detect, in my program, when screen blank is turned off.

What I have tried:

I'm using C++, and my target platform is Windows 7.
I have a fair amount of experience in WinAPI programming.

I would like to detect, in my program, when screen blank is turned off.
This is *not* the screen saver, but the actual screen blanking operation itself.
(i.e., on my current machine, I have screensaver set to None, and "Turn off the display" set to 15 minutes. It is the "Turn on the display" that I wish to detect.).

Can anyone give me advice on what message or event to look for, to handle this task?