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Article #1795

Re: Windows hanging & DLL problems

#1795
From: sampson david 58163
Date: Fri, 22 Mar 1991 15:32
51 lines
3168 bytes
Jim -- your email address bounces at my site so I'll post instead.

You don't say whether you're doing anything in your DLLs during
initialization, like GlobalAlloc, GlobalLock, GlobalUnlock calls, etc.

As a drop back and punt approach, try creating dummy DLLs for test
purposes that only contain the MS code for LibEntry and WEP, and link
that to your application.  Purposly get rid of your DLLs for the time
being.  If the problem re-occurs, the it's in your Non-DLL code.  If
it goes away, try bringing in 1 dll at a time until you isolate down
to the problem module.

Whenever I hear about random behavior in any code (usually my own on a
day to day basis :)) I always suspect memory allocation that's messed
up, a pointer that's declared but doesn't have any space allocated to
it, or a pointer that points to an object that was created by a MS lib
call.  

This last item is usually missed by people and can result in
some severe behavior problems.  To see if you have this particular
problem, see if you have a pointer to an object in memory that's
created by MS.  I ran into this in the GetProfileStrings function.  If
you pass NULL as the second parameter, MS "creates" a list of the LHS
stuff in a section of your win.ini file.  I had a pointer point to the
list that they created so that I could parse the data.  Fine. That
worked and I got the data.  But when I wanted to exit my function
where this was going on, I had to steer my pointer variable away from
the MS data before exiting my function or it would hang the system
(randomly).  I fixed it by making the thing point to NULL before I
exited the function.  Everything works fine now.

I'm not saying this is your particular problem.  You have some fault
isolation to do yet.  But be aware that where a chrash occurs may not
be DIRECTLY correlated to where the problem actually resides (ain't
pointers wonderful????)

--

                                          A new world record
                                          in the javalin throw
                                                
    /                                          /
   /                                          I
-------------------------------------------------


David Sampson                                         Harris Corporation
dsampson@x102a.ess.harris.com                   Gov't Aerospace Systems Divison
uunet!x102a!dsampson                                  Melbourne, Florida

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From: dsampson@x102a.harris-atd.com (sampson david 58163)
Newsgroups: comp.windows.ms.programmer
Subject: Re: Windows hanging & DLL problems
Message-ID: <DSAMPSON.91Mar22103250@x102a.harris-atd.com>
Date: 22 Mar 91 15:32:50 GMT
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Organization: Harris Gov't Aerospace Systems Division
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In-reply-to: jim@newmedia.UUCP's message of 22 Mar 91 04:00:23 GMT