ffi-fiddle-wrapper.rb

gistfile1.rb

# http://www.slideshare.net/tenderlove/hidden-gems-of-ruby-19  on slide 134

module FFI
  module Library
    TYPE_MAP = {
      string:  DL::TYPE_VOIDP,
      pointer: DL::TYPE_VOIDP,
    }
    DL.constants.each{|const|
      next unless const.to_s.match(/^TYPE_/)
      name = const.to_s.spit("_",2).last.downcase.to_sym
      TYPE_MAP[name] = DL.const_get(const)
    }

    def ffi_lib(lib)
      @lib = DL::Handle.new(lib)
    end

    def attach_function(name, args, ret)
      func = Fiddle::Function.new( @lib[name.to_s], args.map{|x| TYPE_MAP[x] }, TYPE_MAP[ret] )
      define_singleton_method(name){|*args| fund.call(*args) }
    end
  end
end