QPrintPreview File, printing PDF Files

[Kumosan]

I think you will need to use Poppler.

No, you don't. Poppler would only be necessary if some sort of preview is required. If you want to send a pdf directly to a printer, you can do so via a normal QPrinter. BUT, and this is the problem, your print system must be able to handle pdf files. Under Linux with CUPS and some distribution magic I can lpr pdf files directly to the printer and probably ghostscript is implicitly used to automatically convert the pdf file into something my printer understands. If and how this works under other systems....no idea.