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Re: Unable to have custom PBM build a printer invoking a custom CUPS backend

Paul,

I did the 'lpinfo -v' and my custom CUPS backend was NOT displayed
editing the line in my custom lpd.cpp for the response when 1 argument
is passed on the command line
puts("network glilpd \"Unknown\" \"GLILPD/LPR Host or Printer\"");
compiled/linked/installed the updated CUPS backend.
stop/restart of CUPS
did a 'lpinfo -v'
my CUPS backend was now registered, cool...
Went into Print Center built a printer through the custom PBM
voila woiked lyke a champ, cool....

thank you sir, I am good to go...

-John

----- Original Message -----
From: "Paul Danbold" <email@hidden>
To: <email@hidden>
Sent: Tuesday, June 03, 2003 6:48 PM
Subject: Re: Unable to have custom PBM build a printer invoking a custom
CUPS backend


> John,
>
> It would help to see your CUPS error_log to understand what's going
> wrong here. I tried to reproduce the problem today on 10.2.6 but
> everything worked fine.
>
> Here's what I did. Maybe you could follow these steps and let me know
> if you still see the 1028 error in Print Center. BTW 1028 is an IPP
> error code, defined as "client-error-not-possible".
>
> // clone lpd backend
> cp lpd.c mylpd.c
>
> // edit mylpd to return something unique
> diff lpd.c mylpd.c
> < puts("network lpd \"Unknown\" \"LPD/LPR Host or Printer\"");
> ---
> > puts("network mylpd \"Unknown\" \"MYLPD/LPR Host or Printer\"");
>
> // edit the makefile to include the mylpd backend
> < BACKENDS = ipp lpd parallel serial socket
> ---
> > BACKENDS = ipp lpd parallel serial socket mylpd
> > mylpd: mylpd.o ../cups/$(LIBCUPS)
> > echo Linking $@...
> > $(CC) $(LDFLAGS) -o mylpd mylpd.o $(LIBS)
>
> // build cups
> cd ..
> sudo make install
>
> // check that the new backend is installed
> ls /usr/libexec/cups/backend/
> http lpd mylpd parallel smb usb
> ipp mdns pap serial socket
>
> // restart the daemon
> sudo killall -HUP cupsd
>
> // check that mylpd is registered
> lpinfo -v
> ...
> network lpd
> network mylpd
> ...
>
> // create a queue with lpadmin
> lpadmin -p test -E -v mylpd://1.2.3.4/q
>
> // create a queue with the advanced pbm
> // run Print Center
> // select Advanced PBM
> // enter a device name, e.g. "test2"
> // enter a device uri, e.g. "mylpd://4.3.2.1/q
> // select a PPD file, or the default generic PPD
> // click Add
>
> Also please see comments below.
>
> -Paul
>
>
>
> On Tuesday, May 27, 2003, at 07:42 PM, John Rice wrote:
>
> > Paul,
> > We are trying to get a custom PBM to build a printer that will
> > invoke a
> > custom CUPS backend. By gleaning information from old TiogaDev
> > postings and
> > from Printing postings we were indeed able to build printers using a
> > custom
> > PBM.
> >
> > Pass the following as CStringRef values for kPMPrinterURI (examples)
> > "pap://*/JSR_hot_folder2/LaserWriter" will build a valid 'AppleTalk'
> > printer
> > "lpd://192.168.123.150/JSR_hot_folder2" will build a valid 'IP
> > Printing'
> > printer
> >
> > but trying the following to invoke a 'custom' backend called 'glilpd'
> > "'glilpd://192.168.123.150/JSR_hot_folder2" fails with a '1028' basic
> > catchall for something wrong with the syntax being passed back to
> > Print Center
> > at printer creation.
>
> I assume your PBM also supplied the other required keys
> (kPMPrBrowserSelectNameKey, kPMPPDNameKey, etc.)
>
> >
> > How do we code the kPMPrinterURI so that it will build a printer that
> > points
> > to a custom backend for processing?
>
> I hope it's just a typo, but in the above paragraph you have
>
> > "'glilpd://192.168.123.150/JSR_hot_folder2"
>
> "glilpd://192.168.123.150/JSR_hot_folder2" is valid
>
> >
> > =====
> > Are the followng statements valid?
> > kPMPPDNameKey defined in PMTicket.h, CStringRef value = URI encoded
> > path/filename of PPD used to build printer
>
> correct
>
> > kPrinterLocation still not defined in any header, key is "Location",
> > not
> > mandatory for printer creation, CStringRef value shows up in the
> > 'Location'
> > field in the 'Printer Info' dialog displayed when the user selects the
> > 'Show
> > Info' icon.
>
> correct
>
> >
> > =====
> > Also by editing the contents of 'Printers.conf' directly and modifying
> > an
> > existing 'lpd'-based printer to now be a 'glilpd'-based printer we
> > were able
> > to invoke our backend successfully.
> > Custom 'glilpd' backend was resident in the
> > '/System/Library/Printers/IOMs'
> > folder at the time Print Center failed to build the printer using
> > custom
> > kPMPrinterURI value.
>
> /etc/cups/printers.conf is where CUPS stores info about all the local
> queues. Better to use lpadmin to modify its contents but as you see,
> it's possible to edit the file to add/modify/delete queues.
>
> >
> > thanks,
> > John
> > email@hidden
> >
> > =====
> > excerpt from mailing list, the basic recipe that we followed
> >
> > To answer your question about GetSelectedPrinters, the rules are as
> > follows. For Tioga PMs, the dictionary returned by GetSelectedPrinters
> > must contain keys for the printer name (kPMPrBrowserSelectNameKey),
> > kind (kPMPrBrowserSelectKindKey), address (kPMPrBrowserSelectAddrKey)
> > and type (kPMPrBrowserSelectRefKey). It looks like your PBM is
> > following this rule. There's an additional rule for CUPS drivers. The
> > address key must be a dictionary containing the PPD name
> > (kPMPPDNameKey), the printer location (kPrinterLocation) and device URI
> > (kPMPrinterURI). It's important to note that we use the presence of
> > the PPD key to differentiate between Tioga and CUPS printer queues --
> > if the key is present, we set up a CUPS queue (for example, cgpdftops
> > -> pstops -> backend, or cgpdftoraster -> rastertoprinter -> backend,
> > etc.) but if the key is absent, we set up a Tioga queue (pdftopm ->
> > dev/null).
> > =====
> > _______________________________________________
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References: 
 >Re: Unable to have custom PBM build a printer invoking a custom CUPS backend (From: Paul Danbold <email@hidden>)



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