[midishare-devel] Fw: How to Write Data to a MIDI File

[Chris S. <cps...@ya...>]

I've tried the following:


/* Create a Format 1 MIDI file */
   9     fd = MidiFileCreate("output.mid", midifile1, TicksPerQuarterNote, 500);
  10     if(fd == NULL) {
  11         printf("File could not be created\n");
  12         error = MidiGetError();      
  13         printf("Error: %ld\n", error);
  14         return 0;
  15     } else if(fd != NULL) {
  16         

It's producing the following output:

File could not be created
Error: 0

The app is generating a MIDI file but its size is 0 bytes.

Any idea what's going on here?

I'm using OSX 10.9.

Cheers,

Chris


________________________________

From: Dominique Fober <fo...@gr...>
To: Chris Share <cps...@ya...> 
Cc: "mid...@li..." <mid...@li...> 
Sent: Friday, 29 November 2013 3:09 AM
Subject: Re: [midishare-devel] How to Write Data to a MIDI File



Hi Chris,

You should rather use high level functions (MidiFileWriteTrack) than MidiFileWriteEv (that requires opening a track first etc…).
Sample code is available at https://sourceforge.net/p/midishare/code/ci/master/tree/libraries/midifile/example.c
—
Dominique




Le 26 nov. 2013 à 12:58, Chris Share <cps...@ya...> a écrit :

Hi,
>
>I'd like to use MidiShare to create MIDI files however I'm having problems understanding how to use the API. Here's what I've tried:
>
>#include "midifile.h"
>
>int main(int argc, char* argv[]) {
>
>midiFILE *fd;
>
>/* we first create a new MIDI file using a format 1*/
>if(fd = MidiFileCreate("output.mid", midifile1, TicksPerQuarterNote, 500)) {
>
>/* for the file consistency, the first track */
>/* to write is the tempo map*/
>MidiSeqPtr myTempoMap = MidiNewSeq();
>MidiFileWriteTrack(fd, myTempoMap);
>
>/* write the second track */
>MidiFileNewTrack(fd);
>MidiEvPtr e = MidiNewEv(typeNote); 
>if (e) { 
>Chan(e) = 0;                    // channels have numbers from 0 to 15 
>Port(e) = 0;                    // port 0 is Modem port, port 1 is Printer port 
>Date(e) = 1000;
>MidiSetField(e, 0, 60);      // the pitch 
>MidiSetField(e, 1, 80);         // the velocity 
>MidiSetField(e, 2, 1000);       // the duration in milliseconds 
>
>MidiFileWriteEv(fd, e);
>
>MidiFreeEv(e);
>} 
>
>MidiFileCloseTrack(fd);
>
>/* and we finaly close the file*/
>MidiFileClose(fd);
>}
>
>    return 0;
>}
>
>This code is producing a MIDI file however its size is zero bytes. What am I doing wrong here?
>
>Cheers,
>
>Chris
>
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