printing a(n existing) file in Qt

[caduel]

I have a file that I'd like to print.
Is it possible (a good idea?) to use QPrintDialog/QPrinter for that?
When I do

QPrintDialog dialog(&printer, myDialog);
if (dialog.exec()) {
   // now I got a printer, but how to print the file...?
   qDebug() << "how to print to" << printer.printerName();
}

QPrintDialog dialog(&printer, myDialog);
if (dialog.exec()) {
   // now I got a printer, but how to print the file...?
   qDebug() << "how to print to" << printer.printerName();
}

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I'd rather not just call "lpr -PMYPRINTER MYFILE" (ugly).

Moreover, the QPrintDialog allows the user to specify the number of copies etc.
If I don't print via QPrinter, how could/should I make an external viewer use those settings?


So, my question boils down to:

• can I print a file with Qt? (i.e. use Qt's printer selection, and have Qt send my file via 'the appropriate channels' to that printer; assuming the printer does understand the file type)
• (I do not want to implement the drawing itself!),
• or do I have to use an external program for that?

(I'd like to avoid calling something platform dependent, otherwise I might just call KDE's kprinter.)

Christoph