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Last modified: July 24, 1996
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How do I save a DataWindow's contents in Rich Text Format?
The short answer is "You can't!", not even if the DataWindow's Presentation Style is set to Rich Text. The PowerBuilder 5 SaveAs() function doesn't support RTF as an output format.
The SaveAs function has another problem: Except for the new HTMLTable! SaveAsType the output only contains data from the buffer. It does not include computed fields and other formatting you've added to the DataWindow's visual representation. One might have wished Powersoft had given us an RTF! SaveAsType similar to HTMLTable! but they didn't.
What Powersoft did give us is the RichTextEdit window control plus the ability to share data between it and a DataWindow control. This is a first for PowerBuilder: A standard Windows control that works better than a DataWindow. As far as heavy-duty program control over RTF data is concerned we must stop repeating the mantra "Always use a DataWindow! Always use a DataWindow! Ommmm, ommmm..."
The way to save DataWindow data in RTF format is to use an ordinary DataWindow to retrieve the data, share it with a RichTextEdit control to add the formatting, and then save the contents of the RichTextEdit control. Here's what it looks like on the screen:
Figure 1: DataWindow and RichTextEdit Controls
Listing 1 shows what happens when the Setup button is pressed. A template file called province.rtf is loaded into the RichTextEdit control by a call to the InsertDocument function(). This template was created separately by another RichTextEdit control (not shown here) and a call to SaveDocument(). Unlike the DataWindow painter, PowerBuilder offers no way to paint the contents of a RichTextEdit control in the development environment. You must actually write and run a program, or use some other RTF-capable product.
Listing 1: cb_setup.clicked
integer li_RC li_RC = parent.rte_province.InsertDocument & ( "province.rtf", true, FileTypeRichText! ) if li_RC <> 1 then MessageBox ( "Error", "InsertDocument" ) return end if li_RC = parent.rte_province.DataSource & ( dw_province ) if li_RC <> 1 then MessageBox ( "Error", "DataSource" ) return end if
The next step in Listing 1 is a call to DataSource() to share the data between the DataWindow and the RichTextEdit control. Why this function isn't called ShareData() is beyond me; perhaps that would be too easy to remember. After this code runs the display looks like Figure 1.
Listing 2 shows how to save the data via calls to SaveDocument(). Multiple calls (and multiple output files) are required when more than one DataWindow row is represented in the RichTextEdit control.
Listing 2: cb_save.clicked
integer li_RC long ll_row long ll_return_row for ll_row = 1 to parent.dw_province.RowCount() // ScrollToRow returns row, not return code. ll_return_row = parent.rte_province.ScrollToRow & ( ll_row ) if ll_return_row <> ll_row then MessageBox ( "Error", "ScrollToRow" ) return end if // Save each rte_province "row" as a separate file. li_RC = parent.rte_province.SaveDocument & ( "prov" + string ( ll_row, "0000" ) + ".rtf", & FileTypeRichText! ) if li_RC <> 1 then MessageBox ( "Error", "SaveDocument" ) return end if next
If you think of the RichTextEdit control as working like a Freeform DataWindow then the calls to ScrollToRow() in Listing 2 will seem natural... except, that is, for the return value. Instead of the integer return code 1 or -1 returned by ScrollToRow for a DataWindow, the RichTextEdit ScrollToRow returns a long result containing the row number if it worked and -1 if it failed.
If you're wondering what RTF output looks like one of the files is shown in Figure 2.
Figure 2: Raw RTF Output
Folks who need to manipulate RTF data may find themselves using the RichTextEdit control instead of DataWindows with the Rich Text presentation style.