Report Printing

rbuser

?I am new to Delphi 4, am adding reports to existing Delphi program.
Have Preview & Print buttons for rpt. If choose Preview, the rpt shows
correctly (sorts & filters included) and will print to default printer if
printer icon clicked. However, if click the Print button I receive error
msg "EAccessViolation". Am stumped now. Any help appreciated. Example
of code used OnClick event: rSalesPriceList.DeviceType := 'Printer';
rSalesPriceList.Print;
Thanx in advance,
Laura



--- posted by geoForum on http://delphi.newswhat.com

nicocizik

Hi Laura,

Which version of ReportBuilder are you currently using? If you set your
Delphi IDE to stop on exceptions, where is the error occuring?

If you are a new user of ReportBuilder, I would definitely recommend reading
and working through the tutorials provided in the ReportBuilder Developer's
Guide located in the \RBuilder\Developer's Guide\... directory. This will
give you a good base on using ReportBuilder and what it is capable of.

--
Regards,

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

rbuser

Nico, I found that my problem occurs when I use an OnBeforePrint Event
handler to maximize the Preview to full screen.
TppCustomReport(Sender).PreviewForm.WindowState := wsMaximized;
TppViewer(TppCustomReport
(Sender).PreviewForm.Viewer ).ZoomPercentage := 100;
I must be missing something - but it is the introduction of this event
that blows up the Print command. Any more suggestions? and Thanx!


reading
Developer's
will
if
error



--- posted by geoForum on http://delphi.newswhat.com

nardmoseley

1. You should use the Report.OnPreviewFormCreate event to access the
PreviewForm

2. The problem with your current code is that Reprot.PreviewForm is nil. The
preview form is not created when the report is printed to the printer.

3. In general, you should never typecast an object without first checking
its type and you should not reference an object's properties without testing
whether the object is nil.

Example:

var
lReport: TppReport;

begin

if (Sender is TppReport) then
begin
lReport := TppReport(Sender);

if (lReport.PreviewForm <> nil) then
lReport.PreviewForm.WindowState := wsMaximized;

end;

end;

4. Here is a list of resources for learning ReportBuilder that you might
find helpful.

---------------------------------------------------------------
Article: Resources for Learning ReportBuilder
---------------------------------------------------------------

1. Learning ReportBuilder is a complete learning system designed to teach
end users how to build a range of reports, but it is also an excellent
resource for the developer who is just getting started with RB. Learning RB
includes a 125-page PDF file, a stand-alone application complete with a
database, and a help file. The PDF file contains a set of tutorials, which
can be completed using the provided application. Learning ReportBuilder can
be downloaded from:

http://www.digital-metaphors.com/LearnRB/LearnRB.exe

2. Learning to RAP is designed to teach end-users how to use ReportBuilder's
Calc workspace to perform calculations and control visual aspects of the
report while it is generating. Learning to RAP includes a 59-page PDF file
and a stand-alone application complete with a database. The PDF file is
comprised of a series of tutorials that step end users through the process
of coding calculations and event-handlers to dynamically control report
generation. The application is used in conjunction with the tutorials so
that the learning experience is interactive. Learning ReportBuilder - RAP
can be downloaded from:

http://www.digital-metaphors.com/LearnRB/LearnRap.exe

3. Developer's Guide

When you install RB, this guide is automatically installed into the
RBuilder\Developers Guide directory. It contains extensive conceptual
information and step by step tutorials which show how to construct reports
and reporting applications within the context of the Delphi IDE.


4. On-Line Help

Accessible via a single click of the F1 key from with the Delphi IDE, this
reference resource explains the classes, methods, properties and events
which make up the product. It is also an excellent source of information
regarding installation, troubleshooting and version history.


5. Examples

There are a large number of example reports and reporting applications
included with RB. These show how to accomplish some of the most frequently
requested types of reports. In total there are probably over 200 different
examples covering everything from crosstabs to full-blown end-user reporting
solutions. The RAP functionality included with ReportBuilder Enterprise has
a separate set of demos, tutorials, and help files.


6. news.digital-metaphors.com

The newsgroups are very active with both Digital Metaphors engineers, TeamDM
members (volunteers specially selected for their knowledge of RB and their
willingness to help) and RB developers all pitching in to answer questions
and help each other out. There is also a Tech Tips 'newsgroup' maintained
by DM Engineers which lists over 100 different articles outlining various
tips and techniques. Probably the easiest way to connect to the newsgroups
is to surf the digital metaphors site, go to the support section and click
the newsgroup of your choice:

http://www.digital-metaphors.com/Subpages/Support/newsgroups.html


ReportBuilder newsgroup archives may be searched using a search engine
hosted by Tamarack Associates. Access the the following URL and then search
the Borland Newsgroup database. Tamarack has indexed the ReportBuilder
newsgroup archives in this database.


http://www.tamaracka.com/




7. support@digital-metaphors.com

When you are working on the really advanced stuff, and need an additional
point of view, we're always glad to help.



--
Tech Support mailto:support@digital-metaphors.com
Digital Metaphors http://www.digital-metaphors.com



--
Nard Moseley
Digital Metaphors Corporation
http://www.digital-metaphors.com