How can I refresh report on preview window?

rbuser

Hi

How can I refresh report on preview window without recreate it?

nicocizik

Hi Sergey,

Try calling TppViewer(ppReport1.PreviewForm.Viewer).RegenerateReport;

Be sure to add ppViewr to your 'uses' clause.

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rbuser

Hi
Ok, its works, but event OnBeforePrint does not fires and I can't apply
changed report params. What can I do?

nicocizik

Hi Sergey,

If you are loading templates at runtime, you may be loosing your event
handlers. Please see the article below on lost event handlers and how to
deal with them...

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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.

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