[DUG] Crystal Reports Crashing the App

[Rohit Gupta]

Robert,

all this can not be correct.  How can a DLL be written that will not 
work with more than one app at a time ?  Especially when there are no 
common resources or files to use.  The data space is mapped to the app 
that is using the dll.

I have also discovered that the memory gets trashed asynchronously of 
report access.  You can leave the app there and 10-30 seconds later it 
will suddenly complain with rubbish errors or just disappear.  This is 
when no one has even touched the keyboard in that time.


Robert martin wrote:
> Hi
>
> Yes.  But what bugs will they have introduced in the process?
>
> Don't know if two would work.  I would guess yes.
>
> Rob Martin
> Software Engineer
>
> phone +64 03 377 0495
> fax   +64 03 377 0496
> web www.chreos.com
>
> Wild Software Ltd
>
>
>
> Rohit Gupta wrote:
>> I see that BO are saying the the crpe is now threadsafe in v11.  Do I 
>> believe them ?
>>
>> Question - do you know if it two crpe components  are allowed in the 
>> same app ?  We use one to interrogate the report for formulas etc and 
>> the other is bound to a form for running the report.
>>
>> Robert martin wrote:
>>> 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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>>
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-- 
*Rohit Gupta*
* B.E. Elec.   M.E.   Mem IEEE    Associate IEE*
*Technical Manager*
*Computer Fanatics Limited*
** 
*Tel*     +64 9 4892280
*Fax*    +64 9 4892290
*Email  *rohit at cfl.co.nz <mailto:rohit at cfl.co.nz>**
*Web    *www.cfl.co.nz <http://www.cfl.co.nz/>
 
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