[DUG] Crystal Reports Crashing the App

[Robert martin]

Hi Rohit

It has been some time since I used the Crpe method of accessing Crystal 
but my understanding is it is not Thread safe and therefore if you use 
it in threads or try running multiple copies of reports it can go bang.  
This may be what you are experiencing.

In the end w gave up on Crpe and now use the Com object to run them.  
This works better but comes with other issues.  I think it is the better 
access method though.

Not a log of help i'm afraid :)

Rob Martin
Software Engineer

phone +64 03 377 0495
fax   +64 03 377 0496
web www.chreos.com

Wild Software Ltd



Rohit Gupta wrote:
> In our real app, the program crashes randomly (regularly for some 
> users) at the instance that Crpe is used.  The app basically 
> disappears which implies that substantial code and/or stack is corrupted.
>
> In a smaller app that only opens the report to get some stats (it does 
> not connect to the database), I can get it to crash in the same 
> fashion predictably.
>
> The sequence of events is open two copies of the app )or one copy of 
> the app and the CRW designer)
> Open any report in the first app (which always assignes ReportName to 
> blank and does not destroy the crpe component
> Open any report in the second app or CRW Designer
> Open any report in the first app and its gone with no trace.
>
> In real life the users can not run multiple copies, the app takes care 
> of that.  However the symptoms are identical leading me to believe 
> that if I can find the cause of the second crash, I can fix the first 
> one.
>
> Any clues anyone ?
> I cant find anything pertinent on google, except for one item where 
> the author insists that the problem is a secret com object that crpe 
> launches and if you wait for it to finish and terminate then there are 
> no crashes.  However, delays dont have any effect on my test case.
>
> In the debugger, if I keep doing F7, everything keeps working.  But as 
> soon as I press F8 or F9, it gets an AV because it starts executing in 
> hyperspace.
>
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