Rep Builder Prof in webservice?

rbuser

Hi are there any concurrency issues using Rep Builder Prof. edition
(12.02/Delphi7) in webservices ?

I have a webservice loading template from sql-db, producing uniquely
named pdf-files and returning the contents of the pdf-file as array of byte.

Sometimes we see empty pdf-files or webservice generates errors like
"TppProducer Print to Printer the filedevice has already been created "

Regards
René/SSV

rbuser

Den 12-11-2013 14:19, René Laursen - SSV skrev:> Hi are there any
concurrency issues using Rep Builder Prof. edition
Sorry, we are using Delphi 2010 not Delphi7. Anyway I don't think this
makes any difference.

nardmoseley

Rene,

Any of the RB Editions can be used to implement a web service. RB Server
Edition implements a multi-threaded web tier and is built upon the same
classes in RB Std/Pro/Ent. That being said, threaded applications require
the developer to provide to for thread safety. The RBuilder help topic for
TppProducer BackgroundPrintSettings contains a good discussion. Also note
that web apps typically run under a different Windows user account

a. Make sure that you provide a thread-safe container for the report to
execute.
b. Make sure that no dialogs are displayed by the report (i.e. set
Report.ShowPrintDialog, ShowCancelDialog, etc to False.
c. Set Report.EnableProcessMessages to False.

rbuser

Hi again

Finally returning to this issue.
Can you perhaps point me in the right direction concerning thread safety ?
The report and datasources are all in the same datamodule and no dialogs
are shown, what else is to be considered ....?

I can't see no Report.EnableProcessMessages property ?
(Using RB 12.02 Pro in Delphi2010)

Regards
René / SSV

(Sorry for - once again - replying to you instead of the newsgroup )

Den 12-11-2013 16:33, Nard Moseley (Digital Metaphors) skrev:

nardmoseley

1. Report.EnableProcessMessages is a public property declared in the
TppProducer class (ppProd.pas).

2. The RBuilder help topic for TppProducer BackgroundPrintSettings contains
a good discussion of thread-safety.

3. In re-reading your original post I notice you say "Sometimes we see empty
pdf-files or webservice generates errors like "TppProducer Print to Printer
the filedevice has already been created." Make sure you are not calling
Report.Print on the same report instance from different threads. Each thread
needs to operate on a separate instance of the datamodule that contains the
report, data connection, etc.


-
Nard Moseley
Digital Metaphors
www.digital-metaphors.com