How to detect when laptop power cable has been disconnected?

Question

For the umpteenth time my laptop just shut down in the middle of my game because my power cable had disconnected without me noticing it.

Now I want to write a little

Answer 1

This may very much depend on your exact operating system. Here are some calls for windows XP, I am sure you can find the Vista equivalents:

http://msdn.microsoft.com/en-us/library/ms704147(VS.85).aspx