require 'phi'
require 'dialogs'

form = Phi::Form.new(:form1, 'formです')
button = Phi::Button.new(form, :button1, 'hoge')
button.align = Phi::AL_CLIENT

button.on_click = proc do
  dlg = Phi::OpenDialog.new
  dlg.filter = 'テキスト(*.txt)|*.txt|すべて(*.*)|*|'
  if dlg.execute
    path = File::expand_path(dlg.file_name)
    if FileTest::readable?(path)
      File::foreach(path) do |l|
        print l
      end
    else
      Phi::message_dlg("#{path}: 読みこむことが出来ません。",
      Phi::MT_ERROR, [Phi::MB_OK], 0)
    end
  end
end

form.show
Phi.mainloop