How to detect which window is the foreground window?

StackOverflow https://stackoverflow.com/questions/851749

  •  21-08-2019
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Question

I need to write an assembly (C#.net 2.0 class library) to monitor all applications currently running in a PC. Especially, I need to know which window is the top one, i.e., catch the event when a window becomes foreground window. Should I use WndProc() to catch related window messages? (I don't want to use timer).

Any reference paper or sample source code? Thanks a lot.

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Solution

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