SoundPlayer
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From: mick on 20 Jun 2010 09:34 Is there any way to detect when a soundplayer (playing asynchronously) has finished playing a sound? mick
From: Peter Duniho on 20 Jun 2010 14:40 mick wrote: > Is there any way to detect when a soundplayer (playing asynchronously) > has finished playing a sound? I assume you're talking about System.Media.SoundPlayer? AFAIK, no. But, you can play the sound synchronously in a thread you have control over and detect the end of the sound that way. For example: SoundPlayer player = �; Action<SoundPlayer> play = p => { p.PlaySync(); MethodToCallWhenSoundIsDone(); }; play.BeginInvoke(player); The above creates a delegate instance from an anonymous method that calls PlaySync() and then calls a method when it's done. Then the Action<SoundPlayer>.BeginInvoke() method causes the delegate instance to be invoked on a thread pool thread asynchronously. Of course, you can implement the threading aspect in any way you like; you could even create a new class that inherits or composites the SoundPlayer class and which adds a new event (e.g. "PlayCompleted") that is raised when the synchronous-play-wrapped-in-a-thread finishes. Pete
From: mick on 20 Jun 2010 17:44 "Peter Duniho" <NpOeStPeAdM(a)NnOwSlPiAnMk.com> wrote in message news:AqydnfpNSvI6_YPRnZ2dnUVZ_qmdnZ2d(a)posted.palinacquisition... > mick wrote: >> Is there any way to detect when a soundplayer (playing asynchronously) >> has finished playing a sound? > > I assume you're talking about System.Media.SoundPlayer? AFAIK, no. But, > you can play the sound synchronously in a thread you have control over and > detect the end of the sound that way. For example: > > SoundPlayer player = �; > > Action<SoundPlayer> play = p => > { > p.PlaySync(); > MethodToCallWhenSoundIsDone(); > }; > > play.BeginInvoke(player); > > The above creates a delegate instance from an anonymous method that calls > PlaySync() and then calls a method when it's done. Then the > Action<SoundPlayer>.BeginInvoke() method causes the delegate instance to > be invoked on a thread pool thread asynchronously. > > Of course, you can implement the threading aspect in any way you like; you > could even create a new class that inherits or composites the SoundPlayer > class and which adds a new event (e.g. "PlayCompleted") that is raised > when the synchronous-play-wrapped-in-a-thread finishes. > > Pete Thanks Pete. Yes I ended up trying something similar except I used a Task (as I`m reading a book about the TPL). The problem I found was that I couldnt stop the sound. The SoundPlayer.Stop() method only seems to work on the thread that started it. The scenario is as follows - I have a "Play" button which when pressed changes to a "Stop" button (I just change the button text property depending on what is happening) and then starts the sound playing. Then there are two scenarios - 1. The user presses the button again to stop the sound when the button text is changed back to "Play" and the sound stops. 2. The sound plays till the end and then the button text changes back to "Play". The problem of course if you start and stop the the player on the main thread is you cant detect when user doesnt actually stop the sound but lets it play to the end - the button text is still stuck on "Stop". I got round it by using the mciSendString() command from winmm.dll to find the length of the sound then set a Timer going that will wait for that amount of time then in its Tick event changes the button text back to Play. I'd never heard of the mci stuff until Googling around today. It works quite nicely but I always feel there's a better way:-) mick
From: mick on 20 Jun 2010 17:51
"mick" <coughcough(a)privacy.com> wrote in message news:udKLDHMELHA.1996(a)TK2MSFTNGP06.phx.gbl... > The problem of course if you start and stop the the player on the main > thread is you cant detect when user doesnt actually stop the sound but > lets it play to the end. Should have said using the asynchronous Play. mick |