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Re: CUPS Support

From: Fred Kiefer
Subject: Re: CUPS Support
Date: Thu, 22 Apr 2004 01:23:16 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.2) Gecko/20040220

On Sunday, April 4, 2004, at 09:58 PM, Chad Hardin wrote:

My time constraints are really tight so I haven't been able to work on the DirectFB backend in quite a while. I couldn't get enough contiguous spare time to work on it. The result was that I was constantly reviewing my previous work and never accomplishing anything worthwhile.
If anyone else want to tackle this go for it!
Anyhow, I've decided to grapple something a bit easier, something I can work on in small chucks. That thing is support for CUPS. I'm making a GSCUPS framework. Later will come a GSCUPSGui framework, and finally some apps for managing CUPS will come forth.
Sounds good?

Sure! What about adding CUPS support to NSPrinter as well? Or some way for NSPrinter to use your framework.

I have been thinking about a CUPS printing backend for GNUstep GUI myself some time ago. The results of my tinkering are attached. The basic idea was to split off just the finding of the PPD file and the transfer of the file to the printer. (As a side effect this would allow us to remove the full set of PPD files currently delivered with GNUstep. Perhaps we should put them in a separate ressources package anyway?)

As I never did find the time to really work on this, it is more a starting point for further brainstorming than a real implementation.
/* -*- mode:ObjC -*-
   XGPrinter - CUPS printer interface for GNUstep

   Copyright (C) 2003 Free Software Foundation, Inc.

   Written by:  Fred Kiefer <address@hidden>
   Date: Sep 2003
   This file is part of the GNU Objective C User Interface Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   Library General Public License for more details.
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#include "config.h"
#include <cups/cups.h>

- (NSArray*) printerNames
  NSArray *allPrinters;
  NSString *printer;
  int numPrinters;
  char **printers;

  numPrinters = cupsGetPrinters(&printers);
  allPrinters = [NSMutableArray arrayWithCapacity: numPrinters];
  for (i = 0; i < numPrinters; i++)
      [allPrinters setObject: [NSString stringWithCString: printers[i]] 
atIndex: i];


  return allPrinters;

- (NSArray*) printerTypes

- (NSString*) ppdFileForPrinter: (NSString*)printer
  const char *filename;

  filename = cupsGetPPD([printer cString]);

  return [NSString stringWithCString: filename]; 
- (void) printFile: (NSString*) filename 
         toPrinter: (NSString*) printer
       withOptions: (NSDictionary*)options
    int result;
    int num_options = 0;
    cups_option_t cupsOptions[[options count]];

    result = cupsPrintFile([printer cString], [filename cString],
                           "GNUstep printing", 
                           num_options, cupsOptions);

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