FFI failing on JRuby on Windows Server 2008

FFI_fail_log_20120426

FFI failing on JRuby on Windows Server 2008

== Installed JRuby / JDK
$ jruby -v
jruby 1.6.7 (ruby-1.9.2-p312) (2012-02-22 3e82bc8) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_31) [Windows Server 2008-amd64-java]

== RubyInstalled devkit is installed for jruby 1.6.7
DevKit-tdm-32-4.5.2-20111229-1559-sfx

== Gem file references FFI
$ cat Gemfile
source "http://rubygems.org"
gem "ffi"

== Install gem FFI
$ gem list

*** LOCAL GEMS ***

bundler (1.1.3)
rake (0.8.7)
sources (0.0.1)

$ gem install ffi --platform=ruby
Fetching: ffi-1.0.11.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
Successfully installed ffi-1.0.11
1 gem installed

$ gem list

*** LOCAL GEMS ***

bundler (1.1.3)
ffi (1.0.11)
rake (0.8.7)
sources (0.0.1)

$ gem list

*** LOCAL GEMS ***

bundler (1.1.3)
rake (0.8.7)
sources (0.0.1)

== Test program
$ cat 01_ffi_cvlancli.rb
require "rubygems"
require "bundler/setup"
Bundler.require(:default)
#require 'ffi'

module CvlanLib
  extend FFI::Library
  if false
    ffi_lib Gem.bin_path('cvlan_lib','cvlancli.dll')
  else
    ffi_lib 'cvlancli.dll'
  end

  attach_function :asai_open, [:string, :int], :int
end

fd = CvlanLib.asai_open('localhost', 0)
puts "asai_open fd=#{fd}"

== Program fails
$ jruby --debug 01_ffi_cvlancli.rb
LoadError: Could not open library 'cvlancli.dll' : The operation completed succe
ssfully.

   ffi_lib at c:/jruby/jruby-1.6.7/lib/ruby/site_ruby/shared/ffi/library.rb:82
   collect at org/jruby/RubyArray.java:2331
   collect at org/jruby/RubyArray.java:2339
   ffi_lib at c:/jruby/jruby-1.6.7/lib/ruby/site_ruby/shared/ffi/library.rb:64
  CvlanLib at 01_ffi_cvlancli.rb:11
    (root) at 01_ffi_cvlancli.rb:6

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