PowerBuilder – Update the Datawindow object definition programatically

Posted on Thursday, October 11th, 2012 at 6:31 pm in

I’m doing some work on an application to aid in the mass update of various datawindow attributes. It’s not rocket science since you are dealing with a series of text files and doing some basic ‘find and replace’ operations. However, if you have ever worked on a project which has been around for a while you will notice that datawindows do not get ‘migrated’ when you upgrade to a newer version of PowerBuilder; the export syntax remains at the version in which the thing was last modified and saved.

Now you might think that using the LibraryExport and LibraryImport methods will do the trick but you would be mistaken. A newly imported datawindow object keeps the same version as when it was exported.

To accomplish the task you need to use the datawindow CREATE method.

integer li_file, li
string ls_old_syntax, ls_importsyntax
// old datawindow syntax saved to a file
ls_old_syntax = 'C:\temp\d_oldstuff.txt'
// open and read the file
li_file = Fileopen(ls_old_syntax, TextMode!)
Filereadex(li_file, ls_importsyntax)
// remember to close the file
FileClose(li_file)
// check version of ls_importsyntax
IF POS(ls_importsyntax, 'release 12.5;') > 1 THEN
   // its already new, leave it alone		
ELSE
   // dw_new is object on the window
   dw_new.reset()
   dw_new.dataobject = ''
   // create the new datawindow object from the old syntax
   li = dw_new.create(ls_importsyntax, ls_err) 
   // now get the new syntax
   ls_new_syntax = dw_new.describe("DataWindow.Syntax")   
END IF

Now you can do whatever you want with the new syntax.

You might also be interested in

Add your comment

Leave a Reply

Top