How do I pass an object into a timer callback function?

The main part of my code has an object called cam. In the middle of the code, I want to call a timer to execute [~,b]=cam.Aqquisition.IsFished every second and output b.

 cam = uc480.Camera;
 %... unrelated
 t = CheckTimer;
 start(t)

In a separate file, I have

 function t=CheckTimer
 t = timer;
 t.TimerFcn = @check;
 t.Period = 1;
 t.TasksToExecute = 10;
 t.ExecutionMode = 'fixedSpacing';
 end

 function check(~,~)
 [~,b]=cam.Acquisition.IsFinished
 end

The error message is: Undefined variable "cam" or class "cam.Acquisition.IsFinished". if I put cam.Acquisition.IsFinished in main part of my code, it works fine.

cam = uc480.Camera;
%... unrelated
[~,b]=cam.Acquisition.IsFinished

How do I pass the object "cam" into a timer callback function and output "b"?

[Jon]

I have a similar problem, did you ever find a solution?

Answer 1

[Sean de Wolski]

Pass cam in with an anonymous function when you create the timer

cam = camera
t = timer(TimerFcn=@(~,~)checkFinished(cam))

function checkFinished(cam)
    whatever_with(cam)
end

[Jon]

Great thank you