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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*Rohit Gupta*
* B.E. Elec. M.E. Mem IEEE Associate IEE*
*Technical Manager*
*Computer Fanatics Limited*
** *Tel* +64 9 4892280
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* B.E. Elec. M.E. Mem IEEE Associate IEE*
*Technical Manager*
*Computer Fanatics Limited*
** *Tel* +64 9 4892280
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please notify us immediately by return email and then delete this
email and any attachments.
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--
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* B.E. Elec. M.E. Mem IEEE Associate IEE*
*Technical Manager*
*Computer Fanatics Limited*
**
*Tel* +64 9 4892280
*Fax* +64 9 4892290
*Email [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>**
*Web *www.cfl.co.nz <http://www.cfl.co.nz/>
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