Is it possible to determine when window focus changes at the system level? I'm writing a time-tracking application, and I'd like to be able to listen for application switching (so that I can begin logging time in a given application). I've poked around the Process class for a good hour here, and while I learned quite a few useful things, I didn't find what I was looking for. I suspect I'll need to use hooks, but it's difficult finding clear documentation on the process, let alone documentation specific to what I'm asking.
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See SetWindowHooksEx.
Good article, "Windows Hooks in the .NET Framework":
http://msdn.microsoft.com/en-us/magazine/cc188966.aspx
于 2009-07-06T12:36:36.693 回答