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Editorial Team
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Asked: 2026-05-13T00:32:03+00:00

No matter what I try (build -> content, NSUrl, filename) I get a ‘null

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No matter what I try (build -> content, NSUrl, filename) I get a ‘null exception’: file not found when I try to play a .caf sound file in monotouch.

//var path = NSBundle.MainBundle.PathForResource("MatchGame", "caf"); 
//var gameSong = SystemSound.FromFile( new NSUrl(path, false));
var gameSong = SystemSound.FromFile("MatchGame.caf");
gameSong.PlaySystemSound();

I also try combinations using the folder name “images/MatchGame.caf” and moving MatchGame.caf into the root folder.

What am I missing? Thanks a lot.

Here is a link to a video of adding the sound in monotouch. http://www.screencast.com/t/MmE0ZmFh What is wrong?

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1 Answer

  1. Editorial Team

    Bryan,

    From looking at your screencast – you are trying to play a mp3 file and not a caf file. Mp3 files are encoded differently and will not play with the SystemSound class that’s there (I can’t remember if you can do this in Obj-C or not.)

    You’ll want to use the AVFoundation Namespace and AVAudioPlayer class.

    using Monotouch.AVFoundation;

var mediaFile = NSUrl.FromFilename("myMp3.mp3");
var audioPlayer = AVAudioPlayer.FromUrl(mediaFile);
audioPlayer.FinishedPlaying += delegate { audioPlayer.Dispose(); };
audioPlayer.Play();

    You might need to tweak the code above – I don’t have MonoDevelop to hand but that should help you a little further.

    Cheers,

    ChrisNTR

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