Reports freezing with V14

rbuser

Hi,

I have created reports using V12 and as we are releasing the final version
next month so I updated the components to V14.

Everything works fine except for reports that have pipelines connected to
shared datasources.
Some of my reports are using the same datasets to display the data into a
DevExpress grid and a report.

In V12 everything was working fine but with V14 as soon as a pipeline is
connected to a dataset that is connected somewhere else everything freezes...

I changed some of these reports to use a dedicated dataset but it is very
annoying.
I can't find what changed between the 2 versions.

Anybody have a clue on this ?

Thanks

nardmoseley

One solution might be to use DataSet DisableControls/EnableControls as shown
below. Even if this does not completely solve the problem, it is recommend
for performance, because when the report iterates over the dataset, the
dataset fires lots of events. (see the Delphi help topic for DataSet
DisableControls)

myDataSet.DisableControls;

try
myReport.Print;
finally
myDataSet.EnableControls;
end;

The other solution where you have shared datasources, set
Report.PreviewFormSettings.SinglePageOnly to True. This will use the old
single page preview. The new scrollable page preview uses a background
thread to generate pages and this is likely the cause of the issue because
the data iteration is occurring in the background thread. (And thus the
events mentioned above occur in the background thread and visual controls
only work in the main thread).


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

rbuser

Thanks for the quick answer!

The DisableControls was causing problems but the preview option fixed everything
for these reports...

I should have asked earlier

rbuser

Nard Moseley (Digital Metaphors) wrote:



That is a really good tip. Thanks.

--
Michael Riley
GySgt USMC Retired
http://www.zilchworks.com