Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!zaphod.mps.ohio-state.edu!ceres.physics.uiowa.edu!iowasp.physics.uiowa.edu!ns-mx!ccad.uiowa.edu!cadsi
Newsgroups: comp.windows.ms.programmer
Subject: Re: How can I intercept application calls to Windows?
Message-ID: <1991May18.200524.21795@ccad.uiowa.edu>
From: cadsi@ccad.uiowa.edu (CADSI)
Date: 18 May 91 20:05:24 GMT
References: <8516@uceng.UC.EDU>
Organization: CAD-Research, U. of Iowa, Iowa City, Iowa
Lines: 20

From article <8516@uceng.UC.EDU>, by dsims@uceng.UC.EDU (david l sims):
> Remember in the good old days of DOS where we could intercept calls to the
> operating system by changing a vector in the interrupt vector table?
> 
> Well, how can I do the equivalent in Windows?  I would like to write an
> experimental program that would simply count the number of times a
> particular Windows procedure was called.  If I could intercept these
> calls, I could maintain a counter and then proceed to call the real
> Windows procedure after I update my counter.
> 
> Any ideas?
> 

SetWindowsHook() is the function you should look at.

|----------------------------------------------------------------------------|
|Tom Hite					|  The views expressed by me |
|Manager, Product development			|  are mine, not necessarily |
|CADSI (Computer Aided Design Software Inc.	|  the views of CADSI.       |
|----------------------------------------------------------------------------|