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pr(2nd )
chapter 20
  Ruby and Microsoft Window

书中的例子：

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CODE:

require 'dl'

User32 = DL.dlopen("user32")
MB_OKCANCEL = 1
message_box = User32['MessageBoxA', 'ILSSI']
r, rs = message_box.call(0, 'OK?', 'Please Confirm', MB_OKCANCEL)
case r
  when 1
    print("OK!\n")
  when 2
    print("Cancel!\n")
end

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