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

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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"?

Accepted Answer

Sean de Wolski
Sean de Wolski on 27 Apr 2022
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

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