error message in app designer when closing app

2022 6 20
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更新时间：2022 6 20
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Hello,
I have made an App that works ok hwoever when I close my app (made in app designer), I get the following error message in the Matlab Command screen:
Invalid or deleted object.
Error in Trade_App_1/startupFcn (line 27)
app.Label_1.Text = Label_L;
Error using matlab.apps.internal.GraphicsCallbackProxy/runCallbackFunction (line 23)
Error while evaluating GraphicsCallbackProxy CallbackFcn.
Can any one help? Thx in advance
Thx
Leon

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Jan
Jan 2022-6-20
Why does the startup function run during closing the dialog?
Geoff Hayes
Geoff Hayes 2022-6-20
@Leon - at what point (or under what circumstances) does this line
app.Label_1.Text = Label_L;
execute? Do you (for example) have a timer that updates this text every x seconds? Please clarify.
Leon
Leon 2022-6-20
Hello Geoff
I have an infinity loop in which I update the label with the data from another function
while 1
xxxxxxx
end
And as I mentioned it only happens when I close the app.
BR
Leon
Leon
Leon 2022-6-20
Sorry the answer is of course for both Jan and Geoff

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Geoff Hayes
Geoff Hayes 2022-6-20

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@Leon - rather than using a while loop to update your label (which I suspect is the cause of the error), I recommend using a timer instead to do the work that is in the body of the while loop. You would then start the timer and then later stop the timer as the app exits. This should prevent the error from occurring.

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Leon
Leon 2022-6-20
Thx for your answer Geoff,
One question. If I use a timer, it could be that while the program is calculating (which might take some time talking about max minutes) the timer will keep updating the data (and also the label as the lable shows the data) and the data is also used for the calculation. So it could be the timer is all the time updating the data and the calculation never gets finished?
Can I pause the timer, or something like that?
BR
Leon
Geoff Hayes
Geoff Hayes 2022-6-20
@Leon - I guess it all depends upon what your current while loop is doing. Is it calculating some result and then updating the label on the UI? Can one iteration of the timer take minutes to calculate? You can stopt the timer and restart it but there doesn't seem to be any pause or resume capability. Can you provide more details about what happens in the body of your while loop?
Leon
Leon 2022-6-20
Thx for you answer Geoff, I will first work with to see if I can solve it. If not I will come back to you.
BR
Leon

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