a demo to show how to enable iPhone play MIDI

PlayMidiDemoViewController.h.m

//
//  PlayMidiDemoViewController.h
//  PlayMidiDemo
//
//  Created by xhan on 9/9/09.
//  Copyright In-Blue 2009. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "fmod.hpp"
#import "fmod_errors.h"

@interface PlayMidiDemoViewController : UIViewController {
	
	IBOutlet	UILabel *time;
	IBOutlet	UILabel *status;	
	NSTimer *timer;
	
	FMOD::System	*system;
	FMOD::Sound    *sound1;
	FMOD::Sound    *sound2;	
	FMOD::Channel  *channel;
}

@property (nonatomic, retain) UILabel *status;
@property (nonatomic, retain) UILabel *time;


- (IBAction)playSound1:(id)sender;
- (IBAction)playSound2:(id)sender;
- (void)timerUpdate:(NSTimer *)timer;

@end

PlayMidiDemoViewController.mm.m

//
//  PlayMidiDemoViewController.m
//  PlayMidiDemo
//
//  Created by xhan on 9/9/09.
//  Copyright In-Blue 2009. All rights reserved.
//

#import "PlayMidiDemoViewController.h"


@implementation PlayMidiDemoViewController

@synthesize status;
@synthesize time;



void ERRCHECK(FMOD_RESULT result)
{
    if (result != FMOD_OK)
    {
        fprintf(stderr, "FMOD error! (%d) %s\n", result, FMOD_ErrorString(result));
        exit(-1);
    }
}





- (void)viewDidLoad {
    [super viewDidLoad];
	system = NULL;
    sound1  = NULL;
    sound2  = NULL;
    channel = NULL;	
}




- (void)didReceiveMemoryWarning {
	// Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
	
	// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
	// Release any retained subviews of the main view.
	// e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [status release], status = nil;
    [time release], time = nil;
    [super dealloc];
}

- (void)viewWillAppear:(BOOL)animated
{
    FMOD_RESULT   result        = FMOD_OK;
    char          buffer[200]   = {0};
    unsigned int  version       = 0;
	
    /*
	 Create a System object and initialize
	 */    
    result = FMOD::System_Create(&system); 
    ERRCHECK(result);
    
    result = system->getVersion(&version);
    ERRCHECK(result);
    
    if (version < FMOD_VERSION)
    {
        fprintf(stderr, "You are using an old version of FMOD %08x.  This program requires %08x\n", version, FMOD_VERSION);
        exit(-1);
    }
    
    result = system->init(32, FMOD_INIT_NORMAL | FMOD_INIT_ENABLE_PROFILE, NULL);
    ERRCHECK(result);
	
	
	// set up DLS file
	FMOD_CREATESOUNDEXINFO   soundExInfo;
	memset(&soundExInfo, 0, sizeof(FMOD_CREATESOUNDEXINFO));
    soundExInfo.cbsize   = sizeof(FMOD_CREATESOUNDEXINFO);
	char dlsName[200] = {0};
	[[NSString stringWithFormat:@"%@/gm.dls", [[NSBundle mainBundle] resourcePath]] getCString:dlsName maxLength:200 encoding:NSASCIIStringEncoding];	
	soundExInfo.dlsname  = dlsName;	
	
		// midi one
	[[NSString stringWithFormat:@"%@/Bass_sample.mid", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];	

    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_CREATESTREAM, &soundExInfo, &sound1);

//    ERRCHECK(result);
    
    result = sound1->setMode(FMOD_LOOP_OFF);
//    ERRCHECK(result);
	
	// midi two
	[[NSString stringWithFormat:@"%@/Drum_sample.mid", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];	
	
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_CREATESTREAM, &soundExInfo, &sound2);
    result = sound2->setMode(FMOD_LOOP_OFF);    

	
//    timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(timerUpdate:) userInfo:nil repeats:YES];
}

- (IBAction)playSound1:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    
    result = system->playSound(FMOD_CHANNEL_FREE, sound1, false, &channel);
    ERRCHECK(result);
}


- (IBAction)playSound2:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    
    result = system->playSound(FMOD_CHANNEL_FREE, sound2, false, &channel);
    ERRCHECK(result);    
}

- (void)timerUpdate:(NSTimer *)timer 
{
	
}

@end