[cups] how to use IPP_OP_GET_PRINTER_SUPPORTED_VALUES to get supportedvalues

[Michael Sweeet]

Fish,

You don’t want IPP_GET_PRINTER_SUPPORTED_VALUES, you want IPP_OP_GET_PRINTER_ATTRIBUTES to get the (currently configured) sides-supported and color-supported attributes.


> On Apr 14, 2015, at 8:15 AM, Fish Shu <shumenghui at gmail.com> wrote:
> 
> I want to use request = ippNewRequest(IPP_GET_PRINTER_SUPPORTED_VALUES)to
> get printer's supportedvalues like color_supported or duplex_supported,but
> How to? thinks for you help. I tried using the following method，but failed.
> 
> #include <iostream>
> 
> #include <cups/cups.h>
> 
> using namespace std;
> 
> int main(int argc, char *argv) {
> 
>    char uri[HTTP_MAX_URI;
> 
>    std::string result;
>    ipp_t *request, *answer;
>    ipp_attribute_t *attr;
>    httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
>                     "localhost", 0, "/printers/%s", argv[1]);
> 
>    request = ippNewRequest(IPP_GET_PRINTER_SUPPORTED_VALUES);
>    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
> NULL, uri);
>        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");
> 
>    answer = cupsDoRequest (NULL, request, "/");
> 
>    for (attr = ippFirstAttribute (answer); attr; attr = ippNextAttribute
> (answer))
>    {
>        std::cout << ippGetName (attr) <<  std::endl;
>        if(ippGetString (attr, 0 ,NULL) )
>        {
>            std::cout << ippGetString (attr, 0 ,NULL) << std::endl;
>        }
>        else
>        {
>            std::cout << "NULL"<< std::endl;
>        }
>    }
>    //ippDelete(request);
>    return 0;
> 
> }
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