Question

The code in my answer below converts musical notes in strings, such as C#-4 or F-3, to their corresponding MIDI note values.

I am posting this because I am tired of trying to dig it up online every time I need it. I’m sure I’m not the only one who can find a use for it. I just wrote this up — it is tested and correct. It’s in Python, but I feel that it pretty close to universally understandable.

Answer 1

#Input is string in the form C#-4, Db-4, or F-3. If your implementation doesn't use the hyphen, 
#just replace the line :
#    letter = midstr.split('-')[0].upper()
#with:
#    letter = midstr[:-1]
def MidiStringToInt(midstr):
    Notes = [["C"],["C#","Db"],["D"],["D#","Eb"],["E"],["F"],["F#","Gb"],["G"],["G#","Ab"],["A"],["A#","Bb"],["B"]]
    answer = 0
    i = 0
    #Note
    letter = midstr.split('-')[0].upper()
    for note in Notes:
        for form in note:
            if letter.upper() == form:
                answer = i
                break;
        i += 1
    #Octave
    answer += (int(midstr[-1]))*12
    return answer