[DUG] Anyone got Crystal 11 to test major bug in CR
Rohit Gupta
rohit at cfl.co.nz
Thu Apr 5 10:59:05 NZST 2007
Has anyone got CR11 installed who is willing to try an very tiny app to
prove that CR is stuffed ?
Neven MacEwan wrote:
> Rohit Gupta wrote:
>
> "Hey Robert Zimmerman got a song for you, bout a young man called
> Dylan with a voice like sand and glue"
>
> Glad you found it (if you had)
>
> N
>> Are you talking about John B Murphy or Frank Zimmerman ?
>>
>> I think I have found the problem. It uses two callbacks from the
>> crpe.ddl back to TCrpe component (to local nested procedures in each
>> case).
>> What amazes me is that works at all. It also explains why the app
>> dies even when it is idle and finished doing the report many seconds
>> ago. It is fiddling with data on the heap thats long gone.. and what
>> about the stack frame ? Yeach !!
>>
>> We have just tried V11. Luckiliy the VCL changes are minor and the
>> reports are working. Still have to look at its source and test the
>> crash cases.
>>
>> Neven MacEwan wrote:
>>> Rohit
>>>
>>> I think the crpe.dll was only written to be used by one app crpe.exe
>>> and is very sequence fragile,
>>> I know the guy that wrote the VCL for it had all sorts of problems,
>>> I'd make sure you don't try to get it to do to many
>>> things at the same time on the same instance
>>>
>>> HTH
>>>
>>> Neven
>>>
>>>> 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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>>>>> _______________________________________________
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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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>>>
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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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>
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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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