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system wide hook

Posted on 2001-06-03
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Last Modified: 2010-04-06
I am using a system wide hook (CBT, Keyboard, and mouse), and therefore I had to write a DLL. When I first wrote this DLL I was having all kind of problems in Windows 95 (that was 3 years ago) until someone told me to compile the DLL with Delphi 2 (instead of Delphi 3 at the time).

I tried this again in Delphi 5 and still the same problem - some MPREXE violation occurs.

I wiuld continue to compile the DLL with D2, but now I have a different error that occurs with the DLL compiled with D2, but not with D5.

When compiling the DLL with D5, is there anything special I need to set for a DLL used as a hook?
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Question by:sharons
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by:Madshi
ID: 6150851
Delphi compiled DLLs do some things during the initialization, which may not be good for hooking. I have written a little utility which can modify the entry point of a DLL, so that it points to your first own exported function (index 1) instead of to Delphi's initialization. This might cure your problems. However, this kills the initialization of all the units. So it makes sense only for ultra-short hooking dlls, which don't need any unit initialization. The utility is available here:

www.madshi.net/hackDll.zip

Perhaps it's worth a try (if your dll is not too complicated)...

Regards, Madshi.
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by:moonrise
ID: 6150937
Thank you - I have found the solution with

  Set8087cw($133f);

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by:robert_marquardt
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No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

PAQ/refund of points

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