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Possible Duplicate:
iOS: Updating Media Information in the Background

I have an application that streams music from a server, I want to show the information of the now playing music when the user lock the iPhone screen actually I have found this code online:

Class playingInfoCenter = NSClassFromString(@"MPNowPlayingInfoCenter");

if (playingInfoCenter) {
    MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
    NSDictionary *songInfo = [NSDictionary dictionaryWithObjectsAndKeys:
                              @"Artist", MPMediaItemPropertyArtist,
                              @"Title", MPMediaItemPropertyTitle,
                              @"AlbumTitle", MPMediaItemPropertyAlbumTitle,
                              nil];
    center.nowPlayingInfo = songInfo;

}

But I don't know where to inject this code I tried to put it inside the IBAction method which is linked to the play button but it didn't work. Is there any one can help me with that ? please. Thanks in advance.

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