Re: [Libexif-devel] listing headers

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

Hey Stanislav,

Thanks for the quick feedback.

> This is broken and can never work, as tags are unique only per IFD, not
> per EXIF. Use exif_tag_get_title_in_ifd.

I see ... makes sense

Actually I was after the GPS information anyway. So I ended up with

    ExifEntry *entry_lat = exif_data_get_entry(ed, EXIF_TAG_GPS_LATITUDE);
    if (exif_entry_get_value(entry_lat, value, sizeof(value))) {
        NSLog(@"lat = %s", value);
    }

    ExifEntry *entry_latref = exif_data_get_entry(ed,
EXIF_TAG_GPS_LATITUDE_REF);
    if (exif_entry_get_value(entry_latref, value, sizeof(value))) {
        NSLog(@"latref = %s", value);
    }

    ExifEntry *entry_lon = exif_data_get_entry(ed, EXIF_TAG_GPS_LONGITUDE);
    if (exif_entry_get_value(entry_lon, value, sizeof(value))) {
        NSLog(@"lon = %s", value);
    }

    ExifEntry *entry_lonref = exif_data_get_entry(ed,
EXIF_TAG_GPS_LONGITUDE_REF);
    if (exif_entry_get_value(entry_lonref, value, sizeof(value))) {
        NSLog(@"lonref = %s", value);
    }

Which seems to work just fine. Now how do I update or add exif
information if not available?
I assume I would have to create a new exif entry with exif_entry_new()
Not sure how to fill it properly though.
For example there is no exif_entry_set_value(). Will I have to modify
the struct directly?

Any pointers?

cheers
--
Torsten