Exempi

Exempi is an ultra-thin FFI-based wrapper for the Exempi C library. It wraps Exempi's functions in the Exempi module.

Don't like dealing with C functions directly? Check out Fasttrack, an object-oriented wrapper around Exempi.

Installation

Add this line to your application's Gemfile:

gem 'exempi'

And then execute:

$ bundle

Or install it yourself as:

$ gem install exempi

Usage samples

Opening a file:

# create an empty file pointer
file_ptr = Exempi.xmp_files_new
Exempi.xmp_files_open file_ptr, "myfile.jpg", :XMP_OPEN_READ

Extracting XMP from a file:

xmp_ptr = Exempi.files_get_new_xmp file_ptr

Fetching an XMP property from a file:

# Exempi provides a set of standard namespace URIs for you
exif_ns = Exempi::Namespaces::XMP_NS_EXIF
xmp_string = Exempi.xmp_string_new

Exempi.xmp_get_property xmp_ptr, exif_ns, 'DateTimeOriginal', xmp_string
datetime = Exempi.xmp_string_cstr xmp_string
Exempi.xmp_string_free xmp_string

For more information see Exempi's function documentation, included in lib/exempi/exempi.rb.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

License

3-clause BSD, identical to the license used by Exempi and Adobe XMP Toolkit. For the license text, see LICENSE.