> I want to make a midi file player, a piece of code who can open a midi file and play this midi file (with loop capability, rewind, forward ...) on a midi output of my choice.

Oh, it is very simple but without midi output :))

<CsoundSynthesizer>
<CsInstruments>
sr     = 44100
ksmps  = 64
nchnls = 1

instr 1
  abyte loscil 0.7, 1/5, 1, 1, 1
  out abyte
endin

</CsInstruments>
<CsScore>
f1 0 0 -1 "fanfare.mid" 0 1 1
i1 0 8
e
</CsScore>
</CsoundSynthesizer>

tito