thank you very much.I have solved this problem through reading some source code.
very thank you for your response.

8年12月13日,周六, Dan Fandrich <dan@coneharvesters.com> 写道:
发件人: Dan Fandrich <dan@coneharvesters.com>
主题: Re: [Libexif-devel] How to get gps information from JPG File? Does anyone know how?
收件人: libexif-devel@lists.sourceforge.net
日期: 2008,1213,周六,7:00上午

On Mon, Dec 01, 2008 at 10:09:32AM +0800, yunwu yunwu wrote:
> Hi,folks:
>      Now I will want to use libexif to get gps information such as
> (latitude,longitude) from jpg file. I don't know how to realize the
function. I
> know  using  exif_entry_get_value can  get other information, but it seems
that
> this function can not get latitude and longitude contained in jpg. Does
any one
> know how to solve the problem? Thanks in advance.

You should be able to get an ExifEntry using exif_content_get_entry() then
access the raw data from that structure directly.  But the latest libexif
should also retrieve them as floats using exif_entry_get_value().

>>> Dan
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