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~rhcarvalho/+junk/racket 

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#lang scheme/base ; Simple use of the FFI
(require ffi/unsafe)
(define mci-send-string
  (get-ffi-obj "mciSendStringA" "Winmm"
    (_fun _string [_pointer = #f] [_int = 0]
          [_pointer = #f] -> [ret : _int])))
(mci-send-string "play sound.wav wait")