setSourceFd
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.
Return
false if an error occurred
Parameters
fd
a file descriptor