Other programs how to get the current key news?

            


I now open the camera application program B A, A How to know the user press a key it?
Handle know the program B is.


Want to solve the problem now is to step to remove that option after taking pictures / abandoned, after taking a direct return. There are other better solution it?
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Subclass methods can be used to modify the window processing function B's.
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HOOK.
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Read, but still do not know, it seems as long as the subclass it. There is no one to point more clearly prompted it?
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Look like you mean A is to write, to call the system B, can simulate a click to see