URGENT - OnPreviewFormCreate, OnPreviewFormClose Events

rbuser

Hi,

I have a report that loads a template from a DataSet BlobField.
I need to Assign some properties to the PreviewForm when it is created, and
save them back when the PreviewForm is closed.

The problem is that these events do not get fired when the report is using a
template and/or is attached to a designer.

All the other reports in the application use these events and they are fired
correctly, but they are not loading templates or attached to designers.

Please help me out solving this problem, as my project timeline ends
tomorrow (29/10/2004) and this problem has just been discovered today while
doing the final tests with the project.

Best regards,

Nuno Fonseca

rbuser

I forgot to mention this:

RB 7.03 Enterprise
Delphi 6 Update 2 Enterprise

nicocizik

Hi Nuno,

The most elegant solution to this problem is to keep all the event handlers
local to the template file you are loading using RAP. RAP is available with
the Enterprise Edition of ReportBuilder. See the article below for more
information on what is happening to your event handlers.

--------------------------------------------
Article: Troubleshooting Lost Event Handlers
--------------------------------------------

Let's assume you have created a report in Delphi and assign an event
handlers to the OnPreviewFormCreate event of the report. The event is
generated by Delphi as:

procedure TForm1.ppReport1PreviewFormCreate(Sender: TObject);

You then save the report to an RTM file 'Report1.RTM.' The events are
stored as references only, and so the RTM contains:

object ppReport1: TppReport
.
.
OnPreviewFormCreate = ppReport1PreviewFormCreate
end

You then go on to work on a different report. Saving it with under then
name 'Report2.RTM'. Only this time, before you save the report you
change the report component name to: rptOrders. Delphi automatically
updates the event declaration for OnPreviewFormCreate event to:

procedure TForm1.rptOrdersPreviewFormCreate(Sender: TObject);


You then create two buttons on the form, one to load Report1 and
preview, the other to load Report2 and preview. When you run the app
and click Report1, you an error. This is because the Report1.RTM file
contains a reference to ppReport1PreviewFormCreate, a method which no
longer exists (at least with this name) in the form.

One answer is to load all your rtm files into the report component you
will be using for loading. Fix any errors, reassign any events that get
cleared. This will update your rtms to contain the proper event handler
names.


--
Regards,

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

rbuser

Thanks Nico, that fixed it.

Best regards,

Nuno Fonseca