Re: double-sided printing SOLVED

[hendrik@topoi.pooq.com]

On Fri, Feb 17, 2006 at 01:26:09PM -0500, hendrik@topoi.pooq.com wrote:
> I use CUPS's xpp.  It lets me tell it whether to print double-sided.
> For files from some programs, it does double-sided when I tell xpp to do 
> so.  For postscript files from my own programs, it prints 
> single-sided anyway.  What kind of postscript code do I need to use so 
> for end-of-page so that xpp and my printer will deign to allow 
> double-sided printing? 
> 
> My printer is a brother HL-1870N networked Postscript printer.
> 
> -- hendrik

The answer was to place the line 

  << /Duplex true >> setpagedevice

near the start of the Postscript file.
The C code I use to write the very minimal Postscript header is now

  fprintf(printer, "%! PRINTPS.CPP PostScript OUTPUT\n");
  fprintf(printer, "<< /Duplex true >> setpagedevice\n");
  fprintf(printer, "/cour /Courier findfont %d scalefont def\n", 
linesize);
  fprintf(printer, "cour setfont gsave\n");

instead of
  fprintf(printer, "%! PRINTPS.CPP PostScript OUTPUT\n");
  fprintf(printer, "/cour /Courier findfont %d scalefont def\n", 
linesize);
  fprintf(printer, "cour setfont gsave\n");

-- hendrik