Screenshot from another program

[Johanna Leimer <johleimer yahoo de>]

I want to write some code that is able to:
- make a screenshot of another running program (has a fixed window title).
- after that I need to extract rectangular areas from different locations within that screenshot
- after that it should analyse (read RGB values) the colours of all the pixels in that area.

The code that does all that needs to be integrated into a C++ program that uses GTK and runs under Windows XP only.

I have no experience in GTK programming but a sound C++ background. If someone could give me some ideas of how I could accomplish that task I would be very happy. If you could have code snippets for me that would be great. If you give me keywords or a rough sketch of how you would do it that's also great.

Any help is very much appreciated.

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