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How to trap events for an OLE object in PowerBuilder

Posted on 2008-10-20
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Last Modified: 2013-12-26
I am trying to use Adobe Distiller to convert postscript files to PDFs using OLE automation. My sample script (attached) works fine for a single file using the FileToPdf function in Distiller. However, I will be running this in  a multi-threaded application, so need to set bSpoolJobs to true so that Distiller will queue the requests. Otherwise, PowerBuilder processes the requests faster than Distiller can handle them, causing an error.

I believe that queueing up the Distiller requests will solve the problem. However, I then need to know when each Distiller process finishes, so that I can move the PDF file, cleanup the files, etc. If I could get at the onJobDone event in the Distiller object, I believe I could then do my cleanup there. However, I have no idea how to get at or code to the events in the ole object.

If I use ConnectToNewObject, as in my attached code example, then there is no visual object in which to code events. I have tried creating an external visual user object and assigning the DLL and class to it, but it just errors out when I try to set any properties or call any functions within the DLL.

Is there any way to create this object around the acrodistdll.dll dll and be able to get at the onJobDone and onJobError events? In visual basic, you can use the "WithEvents" clause to generate the events. Is there any way to do it with PowerBuilder?
integer		li_rc

OLEObject	ole_distill

string		ls_orig_printer, ls_ps_file, ls_pdf_file

string		ls_filename = 'C:\testapp\testapp'
 

// Cleanup from previous run

ls_ps_file  = ls_filename + '.ps'

ls_pdf_file = ls_filename + '.pdf'

FileDelete(ls_ps_file)

FileDelete(ls_pdf_file)
 

// Create and connect to Distiller object

ole_distill = Create OLEObject

li_rc = ole_distill.ConnectToNewObject("PdfDistiller.PdfDistiller.1")

If li_rc <> 0 Then

   Destroy ole_distill 

   Return  

End if
 

// Set distiller properties

ole_distill.bShowWindow = False

ole_distill.bSpoolJobs  = True
 

// Backup original printer and change to PS

ls_orig_printer = PrintGetPrinter()

PrintSetPrinter('Sybase Datawindow PS')
 

// Print to postscript file

dw_1.object.datawindow.print.filename = ls_ps_file

dw_1.object.datawindow.print.printername = 'Sybase Datawindow PS'

dw_1.Print()
 

// Use Distiller to convert postscript file to pdf

li_rc = ole_distill.FileToPdf(ls_ps_file, ls_pdf_file, 'Standard.joboptions')
 

// Reset printer and cleanup

PrintSetPrinter(ls_orig_printer)

Destroy ole_distill

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Question by:stanner
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by:sandeep_patel
sandeep_patel earned 100 total points
ID: 22767413
As far I know it is possible only if you can paste (insert) the control on userobject or window.

Regards,
Sandeep
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stanner earned 0 total points
ID: 23349949
I was unable to get this working with PowerBuilder alone. I finally solved the problem by creating a Visual Basic 6 OCX that interfaced with the Distiller API. I could then place the VB OCX object on a PowerBuilder window and relay the events to PowerBuilder events. This is a bit cumbersome, but seems to work effectively.
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