Question

I am trying to play dynamically few mp3 sounds using AVAudioPlayer.

The following code works fine and indeed plays the sound,
nevertheless I get this error when Analyzing

“Pass-by-value argument in message expression is undefined”

Why so and how should one fix it?

+(void)playSound:(int)soundName
{
    NSString *theSound;
    switch (soundName) {
        case 1:
            theSound = @"beep1.mp3";
            break;
        case 2:
            theSound = @"beep2.mp3";
            break;
        case 3:
            theSound = @"beep3.mp3";
            break;
        default:
            break;
    }
    //
    NSURL *s1 = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@", [[NSBundle mainBundle] resourcePath], theSound]];
    NSError *error;
    AVAudioPlayer *sound1;
    sound1 = [[[AVAudioPlayer alloc] initWithContentsOfURL:s1 error:&error] autorelease];
    sound1.numberOfLoops = 0;
    //[sound1 prepareToPlay];
    [sound1 play];

}

Answer 1

Do you really want to try and play a sound file with no path if soundName is not 1,2 or 3?

For your default clause, either report an error, or just silently return. Don’t create a player with an invalid path and ask to it to play it, it will only get upset.