Reading exif data from a C program

billsee · 07-06-2016, 02:40 PM

I have been hunting around on the WEB trying to find a way to
read exif data from my .jpg images. I am running CentOS 6.8.
The Eye of Gnome (EOG) program shows the exif data but, as far
as I know, cannot save it to a file or stdout. I need a routine
that will read exif data from the command line and print it out
or can be called directly from a C program. libexif is installed
on my system.

pan64 · 07-07-2016, 01:36 AM

https://en.wikipedia.org/wiki/Exchan...rogram_support

billsee · 07-07-2016, 06:46 AM

This answer gave me a link to a Wikipedia page describing the EXIF
format and did not answer my question.

pan64 · 07-07-2016, 06:50 AM

and tell you about libexif, and also will point you to: http://libexif.sourceforge.net/
and also it has some examples: http://libexif.cvs.sourceforge.net/v...trib/examples/

billsee · 07-07-2016, 10:34 AM

I have libexif installed. What I need is an application (program) that
I can dowload and install that will allow me to look at EXIF data from
the command line so I can incorporate it into another program.
Can you suggest an application?

rhubarbdog · 07-19-2016, 08:06 PM

in bash interogate variable $? holds the int value which is the exit(EXIT_SUCCESS) value.
you can transfer the output of stdout text to be arguments using $(...) or `...`
from a c program whether using system or execv both have an int as their return value, this will be the exit value of the command just ran

ntubski · 07-19-2016, 09:11 PM

Searching for "read exit data jpg linux" gave me

https://mikebeach.org/2011/12/17/how...-ubuntu-linux/
http://linux.die.net/man/1/exiftool