Add Network Printer through libcups API

Azuri azuri.shah at fmr.com
Wed Aug 31 06:21:06 PDT 2011


The code I am using is as below. It shows up as raw printer in cups but when I go to any file and click on print this printer doesn't show up.

   http_t *http ;
    char *printer = "Test";
    char *device = "socket://10.105.152.49:9100";
    char *model = "deskjet.ppd";
    ipp_t		*request,		/* IPP Request */
    *response;		/* IPP Response */
    ipp_t		*request_dev,		/* IPP Request */
    *response_dev;		/* IPP Response */
    ipp_t		*request_ppd,		/* IPP Request */
    *response_ppd;		/* IPP Response */
    char		uri[HTTP_MAX_URI];	/* URI for printer/class */
    char        uri_dev[HTTP_MAX_URI];
    char        uri_ppd[HTTP_MAX_URI];

    /*
     * Build an IPP_GET_PRINTER_ATTRIBUTES request, which requires the following
     * attributes:
     *
     *    attributes-charset
     *    attributes-natural-language
     *    printer-uri
     */
    http = httpConnectEncrypt(cupsServer(), ippPort(), cupsEncryption());

    /* set printer device */
    request_dev = ippNewRequest(CUPS_ADD_PRINTER);

    httpAssembleURIf(HTTP_URI_CODING_ALL, uri_dev, sizeof(uri_dev), "ipp", NULL,
                     "localhost", 0, "/printers/%s", printer);
    ippAddString(request_dev, IPP_TAG_OPERATION, IPP_TAG_URI,
                 "printer-uri", NULL, uri_dev);

    /*
     * Add the device URI...
     */

    if (device[0] == '/')
    {
        /*
         * Convert filename to URI...
         */

        snprintf(uri_dev, sizeof(uri_dev), "file://%s", device);
        ippAddString(request_dev, IPP_TAG_PRINTER, IPP_TAG_URI, "device-uri", NULL,
                     uri_dev);
    }
    else
        ippAddString(request_dev, IPP_TAG_PRINTER, IPP_TAG_URI, "device-uri", NULL,
                     device);

    /*
     * Do the request and get back a response...
     */

    if ((response_dev = cupsDoRequest(http, request_dev, "/admin/")) == NULL)
    {
        _cupsLangPrintf(stderr, "lpadmin: %s\n", cupsLastErrorString());

//        return (1);
    }
    else if (response_dev->request.status.status_code > IPP_OK_CONFLICT)
    {
        _cupsLangPrintf(stderr, "lpadmin: %s\n", cupsLastErrorString());

        ippDelete(response_dev);

  //      return (1);
    }
    else
    {
        ippDelete(response_dev);

    //    return (0);
    }


    /* enable_printer */
    request = ippNewRequest(CUPS_ADD_PRINTER);

    httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
                     "localhost", 0, "/printers/%s", printer);
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
                 "printer-uri", NULL, uri);

    ippAddInteger(request, IPP_TAG_PRINTER, IPP_TAG_ENUM, "printer-state",
                  IPP_PRINTER_IDLE);

    ippAddBoolean(request, IPP_TAG_PRINTER, "printer-is-accepting-jobs", 1);

    /*
     * Do the request and get back a response...
     */

    if ((response = cupsDoRequest(http, request, "/admin/")) == NULL)
    {
        _cupsLangPrintf(stderr, "lpadmin: %s\n", cupsLastErrorString());

        //return (1);
    }
    else if (response->request.status.status_code > IPP_OK_CONFLICT)
    {
        _cupsLangPrintf(stderr, "lpadmin: %s\n", cupsLastErrorString());

        ippDelete(response);

        //return (1);
    }
    else
    {
        ippDelete(response);

        //return (0);
    }






> > Thanks Chad I was able to add a printer and enebale it and I can see it in cups webpage. But the problem is user doesn have PPD file or anything. And I am not doing anything for PPD file. After I add the printer I can see it on cups webpage but cant see int he print menu on any page,where it lists all the printers. So how do I make printer visible there?
>
> Thanks,
> Azuri
>
> > The usage message for lpadmin indicates that -p is how you add a printer,
> > which ultimately arrives at set_printer_options().  That's where you should
> > be looking.
> >
> > -Chad
> >
> > On 8/30/11 4:59 PM, "Azuri" <azuri.shah at fmr.com> thusly spake:
> >
> > >
> > > The code I am currently using from lpadmin.c file is below. I get error saying
> > > can't find printer or class.
> > >
> > >
> > >  http_t *http ;
> > >     char *printer = "socket://10.105.152.49:9100";
> > >     char *pclass;
> > >     int  i;   /* Looping var */
> > >     ipp_t  *request,  /* IPP Request */
> > >     *response;  /* IPP Response */
> > >     ipp_attribute_t *attr,  /* Current attribute */
> > >     *members;  /* Members in class */
> > >     char  uri[HTTP_MAX_URI]; /* URI for printer/class */
> > >
> > >
> > >
> > >
> > >     /*
> > >      * Build an IPP_GET_PRINTER_ATTRIBUTES request, which requires the
> > > following
> > >      * attributes:
> > >      *
> > >      *    attributes-charset
> > >      *    attributes-natural-language
> > >      *    printer-uri
> > >      */
> > >     http = httpConnectEncrypt(cupsServer(), ippPort(), cupsEncryption());
> > >     request = ippNewRequest(IPP_GET_PRINTER_ATTRIBUTES);
> > >
> > >     httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
> > >                      "localhost", 0, "/classes/%s", pclass);
> > >     ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
> > >                  "printer-uri", NULL, uri);
> > >
> > >     /*
> > >      * Do the request and get back a response...
> > >      */
> > >
> > >     response = cupsDoRequest(http, request, "/");
> > >
> > >     /*
> > >      * Build a CUPS_ADD_CLASS request, which requires the following
> > >      * attributes:
> > >      *
> > >      *    attributes-charset
> > >      *    attributes-natural-language
> > >      *    printer-uri
> > >      *    member-uris
> > >      */
> > >
> > >     request = ippNewRequest(CUPS_ADD_CLASS);
> > >
> > >     ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
> > >                  "printer-uri", NULL, uri);
> > >
> > >     /*
> > >      * See if the printer is already in the class...
> > >      */
> > >
> > >     if (response != NULL &&
> > >         (members = ippFindAttribute(response, "member-names", IPP_TAG_NAME))
> > > != NULL)
> > >         for (i = 0; i < members->num_values; i ++)
> > >             if (strcasecmp(printer, members->values[i].string.text) == 0)
> > >             {
> > >
> > >                 ippDelete(request);
> > >                 ippDelete(response);
> > >                 //return (0);
> > >             }
> > >
> > >     /*
> > >      * OK, the printer isn't part of the class, so add it...
> > >      */
> > >
> > >     httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
> > >                      "localhost", 0, "/printers/%s", printer);
> > >
> > >     if (response != NULL &&
> > >         (members = ippFindAttribute(response, "member-uris", IPP_TAG_URI)) !=
> > > NULL)
> > >     {
> > >         /*
> > >          * Add the printer to the existing list...
> > >          */
> > >
> > >         attr = ippAddStrings(request, IPP_TAG_PRINTER, IPP_TAG_URI,
> > >                              "member-uris", members->num_values + 1, NULL,
> > > NULL);
> > >         for (i = 0; i < members->num_values; i ++)
> > >             attr->values[i].string.text =
> > > _cupsStrAlloc(members->values[i].string.text);
> > >
> > >         attr->values[i].string.text = _cupsStrAlloc(uri);
> > >     }
> > >     else
> > >         ippAddString(request, IPP_TAG_PRINTER, IPP_TAG_URI, "member-uris",
> > > NULL,
> > >                      uri);
> > >
> > >     /*
> > >      * Then send the request...
> > >      */
> > >
> > >     ippDelete(response);
> > >
> > >     if ((response = cupsDoRequest(http, request, "/admin/")) == NULL)
> > >     {
> > >
> > >     }
> > >     else if (response->request.status.status_code > IPP_OK_CONFLICT)
> > >     {
> > >         _cupsLangPrintf(stderr, "lpadmin: %s\n", cupsLastErrorString());
> > >
> > >         ippDelete(response);
> > >
> > >     }
> > >     else
> > >     {
> > >         ippDelete(response);
> > >
> > >     }
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >> I did look at lpadmin.c file both its not working . But I am totally confusd.
> > >> I did look more into add_printer_to_class method but its not working. All I
> > >> want is when user enters socket://123.45.45.67 to UI, my code should go ahead
> > >> and add the printer tot he mac. I have spent hello lot of time trying to
> > >> figure this out using API's but no success at all so far. Your help will be
> > >> appreciated.
> > >>
> > >> Russell,
> > >>>
> > >>> Just download the CUPS source and look at the lpadmin tool.
> > >>>
> > >>> -Chad
> > >>>
> > >>> On 8/30/11 4:30 PM, "Azuri" <azuri.shah at fmr.com> thusly spake:
> > >>>
> > >>>>> Russell Stewart wrote:
> > >>>>>> Michael Sweet wrote:
> > >>>>>>
> > >>>>>>> You need to create an IPP request and send it using cupsDoFileRequest
> > >>>>>>> (assuming you are using a PPD file or interface script for the queue)
> > >>>>>>
> > >>>>>> OK, I see. So I assume that ippNewRequest() is the method to call for
> > >>>>>> creating the IPP request, right?
> > >>>>>
> > >>>>> Yes.  See the "CUPS Implementation of IPP" document for documentation
> > >>>>> on the attributes and operations:
> > >>>>>
> > >>>>>      http://www.cups.org/documentation.php/spec-ipp.html
> > >>>>>
> > >>>>> --
> > >>>>> ______________________________________________________________________
> > >>>>> Michael Sweet, Easy Software Products           mike at easysw dot com
> > >>>>
> > >>>>
> > >>>> Can you please provice code on how u did it? I am trying to do the same
> > >>>> time
> > >>>> but have no success so far. How can I use API's to add printer to my mac. I
> > >>>> am
> > >>>> developing a Coca app which provides GUI and takes user input to add
> > >>>> printer
> > >>>> using cups. Please let me know
> > >>>> _______________________________________________
> > >>>> cups-dev mailing list
> > >>>> cups-dev at easysw.com
> > >>>> http://lists.easysw.com/mailman/listinfo/cups-dev
> > >>>
> > >>> Chad Hulbert
> > >>> Software Engineer
> > >>> Xerox Corporation
> > >>> 800 Phillips Rd
> > >>> Webster, NY 14580
> > >>>
> > >>> p 585.427.3295  (8*707.3295)
> > >>>
> > >>
> > >
> > > _______________________________________________
> > > cups-dev mailing list
> > > cups-dev at easysw.com
> > > http://lists.easysw.com/mailman/listinfo/cups-dev
> >
> > Chad Hulbert
> > Software Engineer
> > Xerox Corporation
> > 800 Phillips Rd
> > Webster, NY 14580
> >
> > p 585.427.3295  (8*707.3295)
> >
>





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