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Error Tracing / Call Stack

Posted on 1999-08-29
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Last Modified: 2012-05-05
I've been taking a look at several error handling stratagies (especially in the Advanced MS VB 6.0 book) and I'm stumped.

How can I track "re-raised" errors across DLLs?  For example:

      Client.EXE
            Sub Start()
                  Call Test1.Test1

      Test1.DLL
            Sub Test1()
                  Call Test2.Test2

      Test2.DLL
            Test2
                  Err.Raise 5, "Source", "Description"


Client.EXE calls Test1.Test1, which calls Test2.Test2 where an error occurs.  The error handler in Test2.Test2 raises the unhandled error which is caught by the error handler in Test1.Test1, which again raises the unhandled error to the error handler in Client.Start.  At this point I would like to walk through a stack and display something like:

      5, Source, Description, Test2.Test2
      5, Source, Description, Test1.Test1
      5, Source, Description, Client.Start

Any suggestions?

Thanks for your time, Richard
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Question by:richardwhite
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2 Comments
 

Accepted Solution

by:
fmas earned 300 total points
ID: 1534430
What I did is that I create a global ErrorHandler and
compiled as "Global MutilUser" DLL and reference it from
all my DLLs and EXEs. No matter where an error occurs, it
will handed by the ErrorHandler and do what you like it
to do, return to UI to show the error or write to a log
file/DB.

0
 

Author Comment

by:richardwhite
ID: 1534431
I got it.  The subtle part is to place the storage for the class in a standard module so that each instance of the class sees the same call stack.

Chapter 5, Heading "Instance data versus shared data", in Hardcore VB 5.0 has a good description of this.

Thanks for the help, Richard
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