Re: [Libexif-devel] listing headers

[Torsten C. <tc...@va...>]

On Thu, Nov 6, 2008 at 10:22 PM, Jan Patera <pa...@pi...> wrote:
>>     Longitude = 89.00, 40.00, 11.16
>>
>> For one the Longitude format is awkward.
>> Using exiv2 on the file I get
>>  0x0004 GPSInfo      GPSLongitude                Rational    3  89/1
>> 40/1 6978/625
>
> Which format would you like libexif to use? The same format as exiv2 uses,
> i.e. the exact fractions?

Actually - never mind. Just had a look at the spec and found the
exif_set_rational/exif_get_rational ... so that's just the textual
representation. And doesn't really matter that much. (I would have
expected a simple double printed though)

What I haven't worked out yet is how to set 3 rationals.

        entry_lon = exif_entry_new();
        exif_entry_initialize(entry_lon, EXIF_TAG_GPS_LONGITUDE);

        ExifRational value;
        value.numerator = 54
        value.denominator = 1;

        exif_set_rational(entry_lon->data, exif_data_get_byte_order(ed), value);

        exif_content_add_entry(ed->ifd[EXIF_IFD_GPS], entry_lon);

        exif_entry_unref(entry_lon);

According to the spec there are 3 rationals. But I have no idea how to
do that with the API.

May I ask for another pointer? :)

cheers
--
Torsten