[DUG] app terminating abruptly

[Ross Levis]

The problem code I fixed turned out to not be the cause of the app
termination.  It's still occuring, just less often for some reason.

While I'm running in the debugger, I occasionally get an access
violation at 0220F750.  It is always the same location and I suspect 
this must be causing the instant termination when not running in the 
debugger.

In the CPU window if I click "Caller", it jumps to a function
called IsChild inside USER32.DLL.  EAX = 7FFDD000

I'm not sure where to go from here to track this down to code in my app!

I don't think it is a stack overflow problem since the program has been 
running for 2 days on another PC now, and I've had the problem occur in 
the debugger within only a few minutes.

It is not a thread issue.  The error is occuring in the main thread and 
I've checked the other thread code and no unprotected access of the main 
thread is occuring.

The only one thought I had was with the fisSharedMemory component.  This 
uses a file mapping system but without a file.  I'm accessing the same 
memory block written in one app and being read in another app at 50ms 
intervals in both apps, with no locking protection or anything like 
that.  I'm not worried about reading incorrect data, but surely this 
cannot cause an access violation to a memory location that seems totally 
unrelated, or could it?

Cheers,
Ross.