Make the GtkPrintJob send an existing document to the
printing system.
The file can be in any format understood by the platforms
printing system (typically PostScript, but on many platforms
PDF may work too). See [method@Gtk.Printer.accepts_pdf] and
[method@Gtk.Printer.accepts_ps].
This is similar to [method@Gtk.PrintJob.set_source_file],
but takes expects an open file descriptor for the file,
instead of a filename.
Make the GtkPrintJob send an existing document to the printing system.
The file can be in any format understood by the platforms printing system (typically PostScript, but on many platforms PDF may work too). See [method@Gtk.Printer.accepts_pdf] and [method@Gtk.Printer.accepts_ps].
This is similar to [method@Gtk.PrintJob.set_source_file], but takes expects an open file descriptor for the file, instead of a filename.