Calling App Designer object methods from within Timer Callback

2018 10 24
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更新时间：2018 10 24
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Within my app in App Designer I have an object X with its own class methods. I am trying to call this method on a schedule using a timer object within the app. However, whenever I try to do this I get an error from the timer callback function library. It seems that the method call might be being interpreted as another timer callback function though I'm not sure? I have other timer functions that just set application properties (app.Y = 'on') without issue.
What could be the cause here?
The callback function is set here:
app.pageTimer.TimerFcn = @app.timer_event;
and defined here:
function timer_event(app, obj, event)
if app.property
app.X = app.X.method() % call the method on app object
end
end
//EDIT for Error Message. - Throw by timercb.m
Error while evaluating TimerFcn for timer 'timer-19'
Brace indexing is not supported for variables of this type

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Adam
Adam 2018-10-24
Please give full error messages if you get an error, it is a lot easier than you interpreting the error and passing that on, which may or may not be a correct interpretation of it.
Kevin Chng
Kevin Chng 2018-10-24
I did't see any error.
where do you put your function timer_event(app, obj, event)?

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 采纳的回答

Mike Scott
Mike Scott 2018-10-24

0 个投票

Found the answer thanks Adam and Kevin.
The problem was arising in part of the called function. I am a newbie to MATLAB, it looks as though the error handling is different when executing as part of a timer callback.
Instead of performing a trace to flag the offending function it looks like MATLAB routes any error through the timer callback handling, hence my confusion.
thanks

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