Subreport with colums and AV

rbuser

After upgrading from 6.03 to 7.0 (Delphi 5 Pro) an report with folloving
setup produces AV (Stack list included in the end of the message)

On main report's detail band there is only subreport of type pbChild.
This subreport has 2 columns, column witdh 95 (positions 10 and 105) and
column traversal Left to Right.


Exception class: EAccessViolation
Exception message: Access violation at address 00523024 in module
'PARK.exe'. Read of address 00000000
Exception address: 00523024
IsMainThread: True

Stack list, generated 04.11.2002 21:45:26
[00523024] ppHorizontalBandEngine.TppHorizontalBandEngine.StartColumn
[00523024] ppHorizontalBandEngine.TppHorizontalBandEngine.StartColumn
[0063180A] JclHookExcept.HookedExceptObjProc (Line 185, "JclHookExcept.pas")
[0040361D] System.@HandleAnyException
[00500065] ppPrnDev.TppPrinterDevice.DrawBMP
[00523024] ppHorizontalBandEngine.TppHorizontalBandEngine.StartColumn
[00522D1B] ppHorizontalBandEngine.TppHorizontalBandEngine.BeforePrint
[0055D1B3] ppClass.TppBand.GetObject
[00521A27] ppBandEngine.TppBandEngine.ResetObjects
[00521914] ppBandEngine.TppBandEngine.Generate
[005276CE] ppBands.TppDetailBand.Generate
[0051D9F9] ppEngine.TppEngine.GenerateBands
[0051D4D6] ppEngine.TppEngine.GeneratePage
[0051D6F4] ppEngine.TppEngine.RestorePage
[0051D29A] ppEngine.TppEngine.Generate
[0051D193] ppEngine.TppEngine.RequestPage
[0051A55E] ppReport.TppReport.RequestPage
[0051A5A7] ppReport.TppReport.RequestPage
[0057B777] ppDevice.TppPublisher.DoOnPageRequest
[0057B5B0] ppDevice.TppPublisher.Publish
[0057E7B3] ppProd.TppProducer.PublishReport
[0057E82F] ppProd.TppProducer.PrintToDevices
[0057E848] ppProd.TppProducer.PrintToDevices
[0051A44A] ppReport.TppReport.PrintToDevices
[0051A46B] ppReport.TppReport.PrintToDevices
[0057F0FF] ppProd.TppProducer.PreviewFormActivateEvent
[004FCE76] ppForms.TppForm.Activate
[00569391] ppPrvDlg.TppPrintPreview.Activate
[00569368] ppPrvDlg.TppPrintPreview.Activate
[0045574C] Forms.TCustomForm.CMActivate
[0043B74C] Controls.TControl.WndProc
[0043E297] Controls.TWinControl.WndProc
[00455C42] Forms.TCustomForm.CMShowingChanged
[00455D64] Forms.TCustomForm.CMShowingChanged
[00455D80] Forms.TCustomForm.CMShowingChanged
[0043B74C] Controls.TControl.WndProc
[0043E297] Controls.TWinControl.WndProc
[0043DE97] Controls.TWinControl.MainWndProc
[0043DEAE] Controls.TWinControl.MainWndProc
[00453337] Forms.TCustomForm.WndProc
[00413D41] Classes.TThreadList.UnlockList
[004249CD] Graphics.FreeMemoryContexts
[0043DE97] Controls.TWinControl.MainWndProc
[0043DEAE] Controls.TWinControl.MainWndProc
[00453337] Forms.TCustomForm.WndProc
[0043DE97] Controls.TWinControl.MainWndProc
[0043DEAF] Controls.TWinControl.MainWndProc
[00450872] Forms.StdWndProc
[00459041] Forms.TApplication.WndProc
[0045621E] Forms.TCustomForm.ShowModal
[004562B3] Forms.TCustomForm.ShowModal
[00456354] Forms.TCustomForm.ShowModal
[00456374] Forms.TCustomForm.ShowModal
[0057F384] ppProd.TppProducer.DoOnPreviewFormCreate
[0057E908] ppProd.TppProducer.PrintToScreen
[0057E721] ppProd.TppProducer.Print
[0057E740] ppProd.TppProducer.Print
[005199F6] ppReport.TppReport.Print

Any idea how to fix this?

TIA
ain

digitalmetaphors

Can you recreate the problem using DBDemos data and send us an example
report so that we can debug it? Send it to support@digital-metaphors.com


Cheers,

Jim Bennett
Digital Metaphors

rbuser

digitalmetaphors

Data can be accessed at Delphi design time. Can you reproduce the error at
runtime without data? This would make the problem easier to debug.
Debugging Delphi design time packages is not the easiest way to debug.


Cheers,

Jim Bennett
Digital Metaphors

rbuser

digitalmetaphors

Usually, you should get infinite pages when no data pipeline is connected, I
was just curious if generating the first page with no event handlers and no
data would cause an AV. I have the project and will look at it today.


Cheers,

Jim Bennett
Digital Metaphors

digitalmetaphors

I sent you a patch via email.

When one column exists in a report and left to right traversal is turned on,
it causes an AV. It has been fixed for the next release.



Jim Bennett
Digital Metaphors

rbuser

digitalmetaphors

Yes. The reason is that the left to right traversal was broken in 6.03 and
the fix for it in RB 7 introduced a lone bug (which has been fixed and a
patch is available to all registered RB 7 users).


Cheers,

Jim Bennett
Digital Metaphors

rbuser

digitalmetaphors

I sent you the only patch for this issue. I was posting publicly in case
anyone else who may read the thread would know that there was a patch:)


Cheers,

Jim Bennett
Digital Metaphors