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Ruby-FFI is a ruby extension for programmatically loading dynamic libraries, binding functions within them, and calling those functions from Ruby code. Moreover, a Ruby-FFI extension works without changes on Ruby and JRuby. Discover why should you write your next extension using Ruby-FFI here.


  • It has a very intuitive DSL

  • It supports all C native types

  • It supports C structs (also nested), enums and global variables

  • It supports callbacks

  • It has smart methods to handle memory management of pointers and structs


require 'ffi'

module MyLib
  extend FFI::Library
  ffi_lib 'c'
  attach_function :puts, [ :string ], :int

MyLib.puts 'Hello, World using libc!'

For less minimalistic and more sane examples you may look at:

  • the samples/ folder

  • the examples on the wiki

  • the projects using FFI listed on this page


  • You need a sane building environment in order to compile the extension.


From rubyforge:

[sudo] gem install ffi

or from the git repository on github:

git clone git://
cd ffi
rake gem:install


See LICENSE file.

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