Re: [Libexif-devel] listing headers

[Jan P. <pa...@pi...>]

Hi,

> 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?

When the entry doesn't exist yet, you should do something like this:
1) e = exif_entry_new()
2) do something similar that exif_entry_initialize does for e.g.
EXIF_TAG_EXIF_VERSION. Here you will have to set the correct
value(s) using something like
exif_set_short(e->data, exif_data_get_byte_order(e->parent->parent), val);
3) exif_content_add_entry(ifd, e);
4) exif_entry_unref(e);

Hope this helps.
                    -- Jan