Ruby and VLC gtk. Probably doesn't work

app.rb

# released under the public domain

#  I have sort of gotten this to work last year, but I'm in a hurry now. I think it doesn't completely work with GTK...

require 'gtk3'
#require 'vlc'
require_relative 'vlc'

require 'ffi'
module User32
  extend FFI::Library
  ffi_lib 'user32'
end
module User32
    attach_function :GetForegroundWindow, [], :pointer
  end



class MyWindow < Gtk::Window
  def initialize
    super
    
  end

  def addVlc(win)

    win.signal_connect("realize") { |win| 
 
      hwnd = User32.GetForegroundWindow
      xid = hwnd.address
      @vlc_player = VLC::VLCPlayer.new
      @vlc_player.play(File.join(__dir__, 'a.mp4'))
      @vlc_player.set_hwnd(xid)
    }



  end
end

win = MyWindow.new
win.set_size_request(300, 300)
#win.show_all
#xid_value = win.window.




win.signal_connect("delete-event") { |_widget| Gtk.main_quit }
win.addVlc(win)
win.realize

Gtk.main

vlc.rb

# released under the public domain

require 'ffi'

module VLC
  extend FFI::Library
  #ffi_lib File.join(__dir__, 'libvlc.dll')
  #ffi_lib 'libvlc'
  #ffi_lib File.dirname(__FILE__) + '\libvlc.dll'
  ffi_lib 'C:\Program Files\VideoLAN\VLC\libvlc.dll'
  VLC_LIBVLC_MEDIA_H = 1
    
    libvlc_media_option_unique = 0x100
    libvlc_media_option_trusted = 0x2

  attach_function :libvlc_new, [:int, :pointer], :pointer
  attach_function :libvlc_media_new_path, [:pointer, :string], :pointer
  attach_function :libvlc_media_new_location, [:pointer, :string], :pointer
  attach_function :libvlc_media_player_new_from_media, [:pointer], :pointer
  attach_function :libvlc_media_player_play, [:pointer], :void
  attach_function :libvlc_media_player_stop, [:pointer], :void
  attach_function :libvlc_media_player_set_hwnd, [:pointer, :pointer], :void
  attach_function :libvlc_media_player_release, [:pointer], :void
  attach_function :libvlc_release, [:pointer], :void

  class VLCPlayer
    def initialize
      @vlc = VLC.libvlc_new(0, nil)
      @media_player = nil
    end

    def play(path)
      media = VLC.libvlc_media_new_path(@vlc, path)
      @media_player = VLC.libvlc_media_player_new_from_media(media)
      VLC.libvlc_media_player_play(@media_player)
    end

    def stop
      VLC.libvlc_media_player_stop(@media_player)
    end

    def set_hwnd(hwnd)
      VLC.libvlc_media_player_set_hwnd(@media_player, hwnd)
    end

    def release
      VLC.libvlc_media_player_release(@media_player)
      VLC.libvlc_release(@vlc)
    end
  end
end

module User32
  extend FFI::Library
  ffi_lib :user32
  attach_function :FindWindowA, [:string, :string], :pointer
  attach_function :GetForegroundWindow, [], :pointer
  attach_function :find_window, :FindWindowA, [:string, :string], :pointer
  attach_function :get_window_text, :GetWindowTextA, [:pointer, :pointer, :int], :int
  ffi_convention :stdcall
end

def w(title:)
  hwnd = User32.find_window(nil, title)
  return hwnd
end