error message in app designer when closing app

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Leon 2022-6-20

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评论： Leon 2022-6-20

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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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.

Leon

Leon 2022-6-20

Sorry the answer is of course for both Jan and Geoff

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采纳的回答

Geoff Hayes 2022-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/1744085-error-message-in-app-designer-when-closing-app#answer_989555

@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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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 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.

Leon

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MATLAB App Building Develop Apps Using App Designer

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