Preview OK but no data when print

rbuser

Hi,

I have a report with 4 datapipelines link to 4 in-memory TClientDataset
(cds1,cds2,cds3 & cds4).
ClientDatasets are not linked to any table and the data was populated
manually during run-time.
I created a report with no header & footer (datapipeline set to blank) and
have a subreport in the detail band.

Sub report datapipeline is link to one of the cds.
KeepTogether set to False.
PrintBehavor set to pbSection.

When I preview the report everything shown as per expected.
When Click on print or set printdevice to 'Printer' the report printed with
no data.

I suspect the cds is at eof when RB is trying to print it.
I tried set cds.First during report.beforePrint but did not solve the
problem

Please help.
Shely

rbuser

RB version 10.04
Delphi 2006

nicocizik

Hi Shely,

The fact that you are able to see the data when you preview and not when you
print indicates that there is some different code running for the print
option. Are you able to print directly without previewing first?

The Datapipeline simply traverses the data as is. As a test, you might
connect a DBGrid to your client dataset and see where the cursor is when
printing the report to the printer. This may give you some clues on what
exactly is happening.

--
Regards,

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

rbuser

Hi Nico,

I am not able to print direct without preview it.
If print direct, the report is blank. The report only comes out perfect when
in preview.

Pls help
Shely

nicocizik

Hi Shely,

Did you try connecting your datasets to a DBGrid to see if ReportBuilder is
actually able to access the data? Are you able to recreate this behavior
using a minimal application that I could run on my machine? If so, please
send it in .zip format to support@digital-metaphors.com and I'll take a look
at it for you.

--
Regards,

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

rbuser

Ni Nico,

Very strange is that I copied all the report component, client datasets to a
new test application and print from there and it works. The only different
is the test app load the data from file but the actual app is appending the
data into the client dataset during run time.

I tried using Dbgird to show the data on screen it shown correctly (using
the same datasource as the report data pipeline).
When in preview the data also displayed correctly just when print it says no
data for the report (be it direct print or print from preview screen).

I do not know where else to look at. This problem had been bugging me for
long time.

Shely

rbuser

Hi Nico,

I use another method and it works.
The sequence of process:

1. Create a new client dataset (cds2) with exact structure as cds1
2. Call cds2.loadFromFile to load the pre-save data (C:\cds1.dat) .
3. Call cds1.createdataset and append data into cds1
4. Call cds1.saveTofile(c:\cds1.dat)
5. Report datapipeline is now set to use cds2 datasource.
6. Call PPreport to print

The report prints perfectly with the latest data.
Could you explain why?

Shely

nicocizik

Hi Shely,

I'm unsure why this is happening however remember that ReportBuilder simply
retrieves the data that it is given. If no data is showing up for a certain
dataset, then none is available. You might want to re-check your dataset to
be sure the data is actually available for ReportBuilder to gather.

--
Regards,

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

rbuser

Hi Nico,

I found the reason! It is because ReportBuilder re-create the datamodule if
the report is print to printer.
If preview on screen the datamodule is not re-create that why the report is
perfect when preview.
When print, since ReportBuilder re-create the datamodule and all dataset are
blank thats why it print blank.
In my testing app because I load the cds from file during
datamodule.oncreate that why the report can be printed.

Shely