StopFcn not working with audioplayer object

I'm using App Designer with the following code:

app.Player = audioplayer(y, Fs);
app.Player.StopFcn = @PlayerStoppedFcn;

function PlayerStoppedFcn(audioplayer, ~)
      % do something
end

However, this error appears regarding the StopFcn callback...

Warning: Error occurred while executing the listener callback for event Custom defined for class asyncio.Channel:
Error using internal.Callback.execute (line 128)
Undefined function 'PlayerStoppedFcn' for input arguments of type 'audioplayer'. 
> In asyncio.Channel/onCustomEvent (line 473)
  In asyncio.Channel>@(source,data)obj.onCustomEvent(data.Type,data.Data) (line 405) 

Can you help? Thanks in advance.

[Geoff Hayes]

John - it isn't clear from the error message whether the PlayerStoppedFcn cannot be found or whether there is a problem with the input to it. Is this function in a separate m-file that can be found in the MATLAB search path? Or is it embedded somewhere in your App.

One recommendation is to change the function signature

function PlayerStoppedFcn(audioplayer, ~)

The first input parameter is named audioplayer which is the same name as the built-in MATLAB audio player object. Just change this to something diffferent so as not to conflict

function PlayerStoppedFcn(playerObject, ~)

(depending upon your version of MATLAG this could be the object or a handle to the audio player object).

[John D]

Unfortunately, changing the name of 'audioplayer' didn't work.

The PlayerStoppedFcn is placed like so:

function PlayerStoppedFcn(obj, ~)
    disp("Something");
end

function playaudio(app)
    [y, Fs] = audioread("filename.wav");
    app.Player = audioplayer(y, Fs);
    app.Player.StopFcn = @PlayerStoppedFcn;
    play(app.Player);
end

The playaudio(app) function is called from a UI control callback.

Hope this helps.

[John D]

After looking at it again, the following seems to work:

app.Player.StopFcn = createCallbackFcn(app, @PlayerStoppedFcn, true);

Thanks for your help nonetheless.