[cups.development] Add Network Printer through libcups API

Michael Sweet msweet at apple.com
Wed Aug 31 08:41:14 PDT 2011


As documented, cupsAddDest DOES NOT ADD A QUEUE.

On Aug 31, 2011, at 8:17 AM, Azuri wrote:

> I think I should be using cupsAddDest and cupsSetDest to make it visible in mac print UI list, so I added the below code. but it still doesn't show up
> cups_dest_t *mydest;
>    cups_dest_t *newdest;
>    int num_new_dest;
>    num_new_dest = cupsAddDest(printer, NULL, num_new_dest, &newdest);
>    mydest = cupsGetDest(printer, NULL, num_new_dest, newdest);
>    cupsSetDests2(http,num_new_dest, mydest);
>    cupsFreeDests(num_new_dest, mydest);
> 
> 
>> 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)
>>>> 
>>> 
>> 
> 
> _______________________________________________
> cups-dev mailing list
> cups-dev at easysw.com
> http://lists.easysw.com/mailman/listinfo/cups-dev

__________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair





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