iOS xcode 4.6向应用程序添加音频

Question

I'm trying to play an audio file in the background of my app and it isn't playing. The code that I have is:

SystemSoundID SoundID;
NSString *soundFile = [[NSBundle mainBundle] pathForResource:@"HoHey" ofType:@"mp3"];
AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:soundFile], &SoundID);
AudioServicesPlaySystemSound(SoundID);
NSLog(@"%@ is playing\n", soundFile);

The NSLog displays "HoHey.mp3 is playing" but I can't hear it playing. My volume is turned up btw because I hear my videos play when I play them. Any ideas?

Answer 1

You likely have an error somewhere along the way. Try code that looks like this:

SystemSoundID soundID;
NSString *soundFile = [[NSBundle mainBundle] pathForResource:@"HoHey" ofType:@"mp3"];
if(soundFile)
{
    OSStatus status = AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:soundFile], &soundID);
    if(status == noErr)
    {
        AudioServicesPlaySystemSound(soundID);
        NSLog(@"%@ is playing\n", soundFile);
    } else {
        NSLog( @"no sound id created; error status code is %d", status);
    }
} else {
    NSLog( @"couldn't find sound file... is it really in your app bundle?");
}

PS, don't capitalize Objective-C variable names (eg " soundID " instead of " SoundID ").