SinglePageOnly

rbuser

Hello

Delphi XE, Windows 7 64 bit and RBuilder 14.2.

I have a report that worked just fine until the most recent RBuilder
upgrade. The report is attached to a kbmMemTable that contains only one
record and as a result, the report generates only one page of output. The
report would hang when I pressed the print button. It would also hang if
the side by side page view icon on the preview was depressed. After a
significant amount of investigation setting the SinglePageOnly := True
resolved the issue.

This raises the question of how to handle a situation where the total page
number has a range from 1 to > 1? Also, is there a relationship of this
finding with that of Chau Chee Yang's finding on the 20th?

TIA

John

nardmoseley

The new scrollable page preview uses a background thread to generate pages
and this can cause issues in some scenarios.

1. One solution is to use the old single page preview by setting
Report.PreviewFormSettings.SinglePageOnly to True. If you are loading
reports from .rtm files or a database, use the Report.Template.OnLoadEnd
event to set this property after the template loads.

2. If you have datasets that are shared between VCL controls and the report,
try setting 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 that notify the visual controls to update themselves. (see the Delphi
help topic for DataSet
DisableControls)

myDataSet.DisableControls;

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


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

rbuser

Nard:

The tables are shared between VCL components and the report.

Both of the solutions mentioned below worked. Which one is applicable would
obviously depend on the situation.

John