Re: SANE default scanner

[Nicolas George <george@nsup.org>]

Brian (12020-07-27):
> Ok, libsane-hpaio requires libcups.so.2. That's nowhere near requiring
> CUPS, in particular cups-daemon. The printing system is not involved
> with scanning.

This is the last time I grace you with a reply. As I have told you twice
now, unlike you, I have read the source code and I know what I am
talking about. Here are the excerpts:

    /* Look for Network Scan devices if localonly flag if FALSE. */
    if (!localOnly)
    {
        /* Look for all-in-one scan devices for which print queue created */
        cnt = GetCupsPrinters(&cups_printer);
        for (i=0; i<cnt; i++)
        {
            total += AddDevice(cups_printer[i]);
            free(cups_printer[i]);
        }

and:

static int GetCupsPrinters(char ***printer)
{
   http_t *http=NULL;     /* HTTP object */
   ipp_t *request=NULL;  /* IPP request object */
   ipp_t *response=NULL; /* IPP response object */
   ipp_attribute_t *attr;     /* Current IPP attribute */
   int cnt=0;

   /* Connect to the HTTP server */
   if ((http = httpConnectEncrypt(cupsServer(), ippPort(), cupsEncryption())) == NULL)
      goto bugout;

   /* Assemble the IPP request */
   request = ippNew();

   ippSetOperation( request, CUPS_GET_PRINTERS );
   ippSetRequestId( request, 1 );

   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_CHARSET, "attributes-charset", NULL, "utf-8");
   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE, "attributes-natural-language", NULL, "en");
   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD, "requested-attributes", NULL, "device-uri");

   /* Send the request and get a response. */
   if ((response = cupsDoRequest(http, request, "/")) == NULL)
      goto bugout;

   for (attr = ippFirstAttribute ( response ); attr != NULL; attr = ippNextAttribute( response ))
   {
      /* Skip leading attributes until we hit a printer. */
      while (attr != NULL && ippGetGroupTag( attr ) != IPP_TAG_PRINTER)
         attr = ippNextAttribute( response );

      if (attr == NULL)
         break;

      while (attr != NULL && ippGetGroupTag( attr ) == IPP_TAG_PRINTER)
      {
         if (strcmp(ippGetName( attr ), "device-uri") == 0 && ippGetValueTag( attr ) == IPP_TAG_URI && AddCupsList(ippGetString( attr, 0, NULL ), printer) == 0)
            cnt++;
         attr = ippNextAttribute( response );
      }

      if (attr == NULL)
         break;
   }

   ippDelete(response);

 bugout:
   return cnt;
}

Regards,

-- 
  Nicolas George

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