questions from newbie

Zhou X.B.

Hi,

I want to ask some questions about Fast Report for Delphi XE2
- what is "TfrxReport.EngineOptions.DestroyForms" meant for ?
- how can I build a report w/ MDIChild preview that will not refresh its content after ShowReport() ?
My case is: I preview a report of a TClientDataSet, then I need to close the TClientDataSet, when I go back to preview form I want it still showing the previous content of TClientDataSet

Thank you very much

gpi

wrote:

- what is "TfrxReport.EngineOptions.DestroyForms" meant for ?

Sometime you need access report's variables after preparing of report, so you should set TfrxReport.EngineOptions.DestroyForms to False

wrote:

- how can I build a report w/ MDIChild preview that will not refresh its content after ShowReport() ?
My case is: I preview a report of a TClientDataSet, then I need to close the TClientDataSet, when I go back to preview form I want it still showing the previous content of TClientDataSet

You can't get old data in report when dataset was update and report was rebuild. You should leave TClientDataset with old data in open state

Zhou X.B.

gpi wrote: »

gpi wrote: »

- what is "TfrxReport.EngineOptions.DestroyForms" meant for ?

Sometime you need access report's variables after preparing of report, so you should set TfrxReport.EngineOptions.DestroyForms to False

gpi wrote: »

- how can I build a report w/ MDIChild preview that will not refresh its content after ShowReport() ?
My case is: I preview a report of a TClientDataSet, then I need to close the TClientDataSet, when I go back to preview form I want it still showing the previous content of TClientDataSet

You can't get old data in report when dataset was update and report was rebuild. You should leave TClientDataset with old data in open state

qpi,

Thanks for your reply.
You mean FastReports always displays (in preview form) current data of all dataset attached/connected to frxreport ? And there isn't any way to retaining data of the time of PrepareReport ?
I also need to preview 2 reports on same dataset from different range/fliter for comparison, can FastReports help with this ?


Regards,
Zhou X.B.

gpi

wrote:

You mean FastReports always displays (in preview form) current data of all dataset attached/connected to frxreport ?

No, current data of the time of PrepareReport

wrote:

I also need to preview 2 reports on same dataset from different range/fliter for comparison, can FastReports help with this ?

Filter dataset, show first report on first form, filter dataset, show second report on second form
I think for MDI application better to use separate dataset for each MDI form

Zhou X.B.

gpi wrote: »

gpi wrote: »

You mean FastReports always displays (in preview form) current data of all dataset attached/connected to frxreport ?

No, current data of the time of PrepareReport

gpi wrote: »

I also need to preview 2 reports on same dataset from different range/fliter for comparison, can FastReports help with this ?

Filter dataset, show first report on first form, filter dataset, show second report on second form
I think for MDI application better to use separate dataset for each MDI form

Thanks qpi

I understood your info, but I still want to minimize number of datasets in my application, can you show me some way to prevent fastreport refreshing preview window with current data of datasets, or in other words can we force preview window to only show data of dataset at the time we PrepareReport,

Mick.pl

Zhou X.B.

Maybe it is necessary to have a look at your report in a different way.
Till now I imagine your report looks the same (I mean Pages and bands) for both times you prepare it, and the only problem is to show different data for each pass.

I would think of a solution like below:
- Put a MasterData1 band with a virtual data (two rows) which you can set in Designer or assign it with any table with two rows,
- Set MasterData1.StartNewPage to true,
- Construct the whole report as "a child" (not Childband) of that MasterData1,
- And finally fill memos and other controls on report page(s) according to a row number in the table I mentioned above (first and second pass for MasterData1),
- Sure the whole Preview would consist of (2 x N) pages, where N is the number of pages you would normally get for a single run of the report without the MasterData1.


I (we ?) know too less about a concept of your report to give you a solution that will satisfy you.
Could you say a bit more than some technical problems with DataSets?

Regards
Mick

Zhou X.B.

Mick.pl wrote: »

Zhou X.B.

Maybe it is necessary to have a look at your report in a different way.
Till now I imagine your report looks the same (I mean Pages and bands) for both times you prepare it, and the only problem is to show different data for each pass.

I would think of a solution like below:
- Put a MasterData1 band with a virtual data (two rows) which you can set in Designer or assign it with any table with two rows,
- Set MasterData1.StartNewPage to true,
- Construct the whole report as "a child" (not Childband) of that MasterData1,
- And finally fill memos and other controls on report page(s) according to a row number in the table I mentioned above (first and second pass for MasterData1),
- Sure the whole Preview would consist of (2 x N) pages, where N is the number of pages you would normally get for a single run of the report without the MasterData1.

I (we ?) know too less about a concept of your report to give you a solution that will satisfy you.
Could you say a bit more than some technical problems with DataSets?

Regards
Mick

Hi Mick,

Thanks for your kind attention. Sorry that I can't express clearly what I meant. I think of starting a new thread to make it more obvious

Regards,
Zhou X.B.