MidiApplySeq

This function is an iteration. It allows an application apply a function to all the events of a sequence.

pascal void    MidiApplySeq (MidiSeqPtr s, ApplyProcPtr MyProc);

s

a MidiSeqPtr, is a pointer to the sequence to be browsed;

MyProc

a ApplyProcPtr is the address of the function to apply to each event of the sequence.

pascal void    MyProc (MidiEvPtr e);

e

a MidiEvPtr, is a pointer to the current event in the sequence.

Transpose a sequence by one octave.

MidiSeqPtr    s;

void TransposeOctave (MidiEvPtr e)
{
    if (     EvType(e) == typeNote || 
        EvType(e) == typeKeyOn || 
        EvType(e) == typeKeyOff || 
        EvType(e) == typeKeyPress )
        {
            Pitch(e) += 12;    /* normally one must check boundaries */
        }
}
....

MidiApplySeq(s, TransposeOctave);

MidiShare was originally developed in Pascal on the Macintosh. Therefore, in C, all functions passed as arguments of a MidiShare function must be declared as Pascal. In the previous example, TransposeOctave should be declared as :

pascal void TransposeOctave (MidiEvPtr e);