This works perfectly for me:

DO wconnect
o = CREATEOBJECT("wwGhostScript")

*** Assign a PostScript Driver (or you can use an installed PS driver
o.cPrinterDriver = FindPostScriptPrinter()

*** Open data for report
USE wwDemo\tt_cust

*** Run the report
? o.PrintReport(fullpath("wwDemo\CustList.frx"),"c:\temp\test.pdf")

*** Show the report in PDF Viewer
GoUrl("c:\temp\test.pdf")

RETURN

The key is to get the printer driver right. Here are drivers that exist on each plaform, but need to be installed:

Xerox Phaser 6120 PS (Win 7)
Xerox Phaser 1235 PS (Vista)
Apple Color LW 12/660 PS (XP and prior)

You can optionally use wwAPI's InstallPrinterDriver to install a printer driver dynmamically when the app is configured.

+++ Rick ---

I am trying to use wwGhostScript but GhostPsToPdf call in wwGhostScript :: PrintReport keeps returning false. ghostscript 8.1 is installed in C:\Program Files\gs\gs8.1\

What may be the problem? TIA,

Are you using a valid Postscript printer driver?

+++ Rick ---

Tried HaruPDF and the wrapper created by Dorin Vasilescu. Super fast. Small issues easy to work around.

http://libharu.sourceforge.net/
http://www.foxite.com/archives/harupdf-library-wrapper-and-pdf-listener-0000188422.htm
http://sites.google.com/site/pdfclasses/

Worth making payments to Dorin and the creator of HaruPDF (Takeshi Kanno <takeshi_kanno@est.hi-ho.ne.jp>)

Alex