A simple hooking problem

[generic_user_id]

I'm trying to hook up to another program, using SetWindowsHookEx. I need to hook to a specific application (ie: calc.exe) so a global hook shouldn't be neccecary.

HHOOK hook = SetWindowsHookEx(WH_MOUSE,
(HOOKPROC) MouseHookProc,
AfxGetInstanceHandle(),
tID // Thread ID of Calc.exe
);

SetWindowsHookEx returns 0, the hook is set succesfully. Yet, when I move with my mouse over the calc dialog, the calculator crashes. I think I need to use the Process instance of calc.exe instead of the instance of the program that hooks to it. If that is the case, how can I get the HINSTANCE of a process? If that's not the case, what am I doing wrong? Thanks in advance and kind regards, Griffith

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Everything you say will be misquoted, ripped out of context and used against you.

[Scott H Settlemier]

You gotta put the hook procedure in a dll that can be loaded by Calc.exe's process. Then pass SetWindowsHookEx the HINSTANCE for that dll as loaded into your process. (as well as the pointer to the hook procedure)

[generic_user_id]

Okay, thanks I'll try that then. Cheers Griffith

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Everything you say will be misquoted, ripped out of context and used against you.

[Joel Lucsy]

A return of 0 means it didn't work. NULL = 0. Check the docs. As previously mentioned, the actual procedure needs to be in a dll. Joel Lucsy (jjlucsy@concentric.net)

[generic_user_id]

My mistake, I meant to say that GetLastError() returned 0, just after I attempted to create the hook. I thought I had to place the procedure in a DLL only for system-wide hooks, but it appears it's in order for all hooks outside of the calling process. Griffith

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Everything you say will be misquoted, ripped out of context and used against you.