How do cups filters work

[Anonymous]

> raith at hlrs.de wrote:
> >
> > Can anybody give me a hint where I find documentation about
> > how the filtering works in CUPS step by step.
> >
> > I defined a Nashuatec Postscript Printer (NRGD3545) using their PPD File in CUPS. On WINDOWS I use the driver they supply. If I send the printjob from WINDOWS I get the error message printed on the NRGD3545:
> >
> > ERROR: undefined
> > OFFENDING COMMAND: @PJL
> >
> > STACK:
> >
> > I did the following testing:
> >
> > 1) Printed my documment to a file on Windows and used lpr to send this file to the the NRGD3545. Perfect printout!!
> > 2) Stopped the NRGD3545 printer queue on the CUPS server and print the
> > same document to the CUPS server. Compare the queue file and the    Windows local file. No difference!! Use lpr to send the CUPS queue file
> > directly to the printer. Ups ERROR like obove. Use lpr -oraw instead.
> > Perfect printout. From CUPS error-log I can see that pstops is used to
> > print the file.
> >
> > the file in question looks like:
> >
> > %-12345X at PJL JOB
> > @PJL ENTER LANGUAGE = POSTSCRIPT
> > %!PS-Adobe-3.0
> > %%Title: Microsoft Word - Dokument1
> > %%Creator: PScript5.dll Version 5.2.2
> > %%CreationDate: 4/12/2005 15:23:43
> > %%BoundingBox: (atend)
> > %%DocumentNeededResources: (atend)
> > %%DocumentSuppliedResources: (atend)
> > %%DocumentData: Clean7Bit
> > %%TargetDevice: (NRG 3545/3518/3532 PS3) (3011.103) 2
> > %%LanguageLevel: 3
> > %%EndComments
> >
> > the first char is 0x1E = escape
> >
> > If I edit the queufile and delete the first two lines. Perfect
> > printout.
> >
> > CUPS error-log says somewhere:
> >
> > [Job 11] Page = 595x842; 12,12 to 583,830
> > D [12/Apr/2005:19:31:21 +0200] [Job 11] Skipping PJL header...
> > D [12/Apr/2005:19:31:21 +0200] [Job 11] slowcollate=0, slowduplex=0, sloworder=0
> > D [12/Apr/2005:19:31:21 +0200] [Job 11] 0 %%Title: Microsoft Word - Dokument1^M
> >
> > It seems that this is not done properly. The filter does not work
> > how it is expected. As I do not know how these filters work or what
> > else happens I am stuck here. I hope that more experienced users can
> > help me or tell me where to find help.
> >
> > regards
> >
> > Dieter
>
> The escape character should be 0x1B .
> Otherewise the PJL stuff won't be recognized.
>
> Helge
>
> --
> Helge Blischke
> Softwareentwicklung
> SRZ Berlin | Firmengruppe besscom
> http://www.srz.de


Sorry it is 0x1B