Printing in another printer throws exception

rbuser

Hello,

I'm running into a really anoying issue with RB.
I'm pretty sure it must be my fault but would like to have your help in
order to find out exacly what is going on here.
Well, I have a report that does what follows

1 - Get the template from the DB
2 - Link the detail beforeGenerate to a local Delphi function, this function
2.1 - Manually constructs a ClientDataSet
2.2 - Links the detailBand to my local dataPipeline (wich is linked to
the clientDataSet mentioned above)
3 - print

It all runs ok, the report is shown in the screen.

If I try to print it to the default printer, it goes OK!

If I try to print it in another printer it throws an exception.
Investigating a little further I found out that the RB is trying to open my
ClientDataSet. It was created and constructed already so, why it is trying
to open again. I think it is related to the printer changing.


Any help?

Thanks

nicocizik

Ricardo,

Which version of ReportBuilder and Delphi are you using? If you create a
minimal example, (form, report, button) are you able to recreate this
behavior?

--
Regards,

Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com

nicocizik

Hi Ricardo,

Re-reading your post, you do not want to set up your data access inside the
DetailBand.BeforeGenerate event. This is much too late to do so and this
event can fire multiple times. Perhaps try using a different event such as
the OnInitializeParameters.

--
Regards,

Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com

rbuser

It's really complicated to isolate the issue right now. I'm preparing
something isolated but, if you could answere me this I thing I can move
toward the solution (or the isolation of the issue):

When I print in some printer different than the report's default, does RB
reopen my Pipelines?
Because this is happening to me, I just don't know if I am causing this or
if it is the default behaviour.

Thanks and sorry for the messy informations I'm giving, it's because this
code is really complex.

nicocizik

Hi Ricardo,

Yes, if you change from the default printer after the report has already
been previewed, the engine is re-initialized which in turn re-opens the
pipelines connected to the report.

--
Regards,

Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com

rbuser

I thing my problem is in this point. Because when it renders the first time
it only opens the pipelines linked to visible bands. The second time it
tries to open every pipeline, it happend that given my logic some datasets
are not populated. One of this datasets (TClientDataSet) has no provider and
I populate it "by hand", but only when it's band is visible. Once RB is
trying to open every pipeline it tries to open this CDS and a "no data
provider" exception is thrown.

Att.

nardmoseley

During initialization, the report engine tries open and initializes every
datapipeline associated with the report - including data-aware controls,
child reports, etc.



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