Re: [cups-devel] how to get supported media information for a particular printer

Thanks Michael.
I used cupsGetNamedDest to initialise cups_dest_t but it still fails in
cupsFindDestSupported().
----------
void getMedia(char *name)
{
    cups_dest_t *dest = cupsGetNamedDest(CUPS_HTTP_DEFAULT, name, NULL);
    if (dest == NULL) {
        printf("cupsGetNamedDest failed %s\n", cupsLastErrorString());
        return;
    } else {
        printf("dest name %s\n", dest->name);
    }
    cups_dinfo_t *info = cupsCopyDestInfo(CUPS_HTTP_DEFAULT, dest);
    if (info == NULL) {
        printf("CopyDestInfo Request failed %s\n", cupsLastErrorString());
    }
    ipp_attribute_t *media = cupsFindDestSupported(CUPS_HTTP_DEFAULT,
                              dest, info, CUPS_MEDIA);
    if (media != NULL) {
        int i, count = ippGetCount(media);
        printf("count %d\n", count);
        for (i = 0; i < count; i++)
            printf(" %s\n", ippGetString(media, i, NULL));
    } else {
        printf("FindDestSupported Request failed %s\n",
cupsLastErrorString());
    }
}

----------------------------citing----------
dest name Ricoh-Aficio-MP-5002
CopyDestInfo Request failed successful-ok
FindDestSupported Request failed Invalid argument
----------------
I am not sure if cupsCopyDestInfo() failed or not . The manual does not say
the return value if there is error. cupsGetLastErrorString() conveys there
is no error yet "info" is NULL.

Could you please suggest as to what else is going wrong?
I could not find "_cups_dinfo_s" structure definition in
https://www.cups.org/doc/cupspm.html#cups_dinfo_t.
Also, cupsFindDestSupported() manual shows "Find the default value(s) for
the given option." which is same as cupsFindDestDefault(). I think the
former should be texted as "Find supported value(s) for the given option".

Regards
Prasanta

On Mon, Jul 31, 2017 at 7:11 PM, Michael Sweet <[email protected]> wrote:

> You can't initialize a cups_dest_t structure directly like that and have
> it work.
>
> Use:
>
>     cups_dest_t *dest = cupsGetNamedDest(CUPS_HTTP_DEFAULT, name, NULL);
>
> Then cupsCopyDestInfo will have the information it needs to get the
> supported media for you...
>
>
> > On Jul 31, 2017, at 6:01 AM, My Sadhukhan <[email protected]> wrote:
> >
> > Hi All,
> >
> > I was trying to find the supported media for a particular printer using
> > non-ppd based API but am encountering a problem.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > *void getMedia(char *name){    cups_dest_t dest;    dest.name
> > <http://dest.name> = name;    dest.instance = name;    dest.is_default =
> > 0;    cups_dinfo_t *info = cupsCopyDestInfo(CUPS_HTTP_DEFAULT, &dest);;
> > if (info == NULL) {        printf("CopyDestInfo Request failed %s\n",
> > cupsLastErrorString());    }    ipp_attribute_t *media =
> > cupsFindDestSupported(CUPS_HTTP_DEFAULT,
> > &dest, info, CUPS_MEDIA);    if (media != NULL) {        int i, count =
> > ippGetCount(media);        printf("count %d\n", count);        for (i =
> 0;
> > i < count; i++)            printf(" %s\n", ippGetString(media, i,
> > NULL));    } else {        printf("FindDestSupported Request failed
> %s\n",
> > cupsLastErrorString());    }}int main(void){
> > getMedia("Ricoh-Aficio-MP-5002");*
> > *}*
> >
> > I am getting
> > -----------
> > CopyDestInfo Request failed (null)
> > FindDestSupported Request failed Invalid argument
> > -----------
> >
> > Earlier, I was using
> > char filename = cupsGetPPD("Ricoh-Aficio-MP-5002");
> > ppd_file_t *ppd = ppdOpenFile(filename);
> > ppd_option_t *optionPage = ppdFindOption(ppd, "PageSize") and get
> > optionPage->choices->text
> > to get the below supported media size information obtained from that
> > printer ppd.
> > That is, in* /etc/cups/ppd/Ricoh-Aficio-MP-5002.ppd*,
> > I have this and I am interested in getting "A3", "A4", "A5", "A6", "B4",
> > "B5"..."EngQuatro.FullBleed" etc.
> >
> > but now, since ppd API is deprecated, I want to use the new IPP-based
> api.
> >
> > Could anyone suggest what I need to use in above code?
> >
> > *%========== Information About Media Sizes ==========
> >
> > *DefaultImageableArea: A4
> > *ImageableArea A3/A3: "12 12 830 1179"
> > *ImageableArea A4/A4: "12 12 583 830"
> > *ImageableArea A5/A5: "12 12 408 583"
> > *ImageableArea A6/A6: "12 12 285 408"
> > *ImageableArea B4/B4 (JIS): "12 12 717 1020"
> > *ImageableArea B5/B5 (JIS): "12 12 504 717"
> > *ImageableArea B6/B6 (JIS): "12 12 351 504"
> > *ImageableArea Legal/Legal: "12 12 600 996"
> > *ImageableArea GovernmentLG/8.25x14: "12 12 582 996"
> > *ImageableArea EngQuatro/8x10: "12 12 564 708"
> > *ImageableArea GLT/8x10.5: "12 12 564 744"
> > *ImageableArea Letter/Letter: "12 12 600 780"
> > *ImageableArea Statement/5.5x8.5: "12 12 384 600"
> > *ImageableArea F/8x13: "12 12 564 924"
> > *ImageableArea Folio/8.25x13: "12 12 583 923"
> > *ImageableArea FanFoldGermanLegal/8.5x13: "12 12 600 924"
> > *ImageableArea Tabloid/11x17: "12 12 780 1212"
> > *ImageableArea 12x18/12x18: "12 12 852 1284"
> > *ImageableArea 11x15/11x15: "12 12 780 1068"
> > *ImageableArea 10x14/10x14: "12 12 708 996"
> > *ImageableArea 10x15/10x15: "12 12 708 1068"
> > *ImageableArea 11x14/11x14: "12 12 780 996"
> > *ImageableArea Executive/Executive: "12 12 510 744"
> > *ImageableArea Env10/Com10 Env.: "12 12 285 672"
> > *ImageableArea EnvMonarch/Monarch Env.: "12 12 267 528"
> > *ImageableArea EnvC5/C5 Env.: "12 12 447 637"
> > *ImageableArea EnvC6/C6 Env.: "12 12 311 447"
> > *ImageableArea DLEnv/DL Env.: "12 12 299 611"
> > *ImageableArea 8Kai/8K: "12 12 745 1094"
> > *ImageableArea 16Kai/16K: "12 12 541 745"
> > *ImageableArea A3.FullBleed/A3 (Full Bleed): "0 0 842 1190"
> > *ImageableArea A4.FullBleed/A4 (Full Bleed): "0 0 595 841"
> > *ImageableArea A5.FullBleed/A5 (Full Bleed): "0 0 420 594"
> > *ImageableArea A6.FullBleed/A6 (Full Bleed): "0 0 297 419"
> > *ImageableArea B4.FullBleed/B4 (JIS) (Full Bleed): "0 0 729 1031"
> > *ImageableArea B5.FullBleed/B5 (JIS) (Full Bleed): "0 0 516 728"
> > *ImageableArea B6.FullBleed/B6 (JIS) (Full Bleed): "0 0 363 515"
> > *ImageableArea Legal.FullBleed/Legal (Full Bleed): "0 0 612 1007"
> > *ImageableArea GovernmentLG.FullBleed/8.25x14 (Full Bleed): "0 0 594
> 1007"
> > *ImageableArea EngQuatro.FullBleed/8x10 (Full Bleed): "0 0 576 719"
> > ...
> > ..
> >
> > Thanks & Regards
> > Prasanta
> > _______________________________________________
> > cups-devel mailing list
> > [email protected]
> > https://lists.cups.org/mailman/listinfo/cups-devel
>
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer
>
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>