Global hook event canceling

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Hello! I was wondering what would happen if I had two different applications with global hooks "listening" for the same events(let's say for a key press) and both of them were programmed to cancel the event and then show a message?

Would both of the show the message or only one? If so why?

P.S. I would do this experiment myself but i can't and since my curiosity is killing me I thought to ask here.

Posted 14-Sep-13 8:31am

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CPallini · Answer 1 · 2013-09-14T09:34:00

From MSDN[^]:

The action a hook procedure can take depends on the type of hook involved. The hook procedures for some types of hooks can only monitor messages; others can modify messages or stop their progress through the chain, preventing them from reaching the next hook procedure or the destination window.

Hence, I suppose (like you, I have not tested it) that only the first hook procedure intercepting the event would show the message.