Is it possible to recover a corrupted *.mlapp file?

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Matt Brown 2022-8-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1777475-is-it-possible-to-recover-a-corrupted-mlapp-file

评论： Robert Philbrick 2024-5-7

PlotDigitizer.mlapp

I was working on an app and had just got the thing to work when the file became corrupted. When I tried to run the file (and now when I try to open it), I get an error dialog:

"Error loading 'PlotDigitizer.mlapp'.

And then this appears in the command window:

"Error using which

C:\Work\Matlab\Apps\Plot Digitizer\PlotDigitizer.mlapp: Can't open file.

Error in run (line 55)

pathscript = evalin('caller', strcat('which(''', script, ''')'));"

I tried to find a solution to this online and came up with reseting preferences... which didn't work.

This the second time this has occured, forcing me to loose several hours of work, and I am not even sure what I did to cause it, if anything. It seemingly worked one minute and then not the next.

Is App Designer that unstable? Is there a way to recover this or at least copy the text portion of the code?

Also, what options do I have for backup or autosave?

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Matt J 2022-8-10

If you restart Matlab, is the result any different?

Matt Brown 2022-8-11

Negative. Reseting the preferences required a restart of Matlab.

I attached the *.mlapp file to the original post if you want to give it a shot.

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采纳的回答

Robert Philbrick 2022-8-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1777475-is-it-possible-to-recover-a-corrupted-mlapp-file#answer_1026980

编辑：Robert Philbrick 2022-8-15

在 MATLAB Online 中打开

PlotDigitizer.mlapp

The app became corrupt due to an invalid character entered on line 413:

if(c == <escape character here>)                        % Exit when Esc key is pressed

The "escape" character that you used is not supported in the MLAPP code file. This is a bug and I have reported it to the App Designer team.

I fixed the app (attached) so that it will now load by removing the escape character and replacing it with 'escape'. A better way to detect if the user has pressed the escape key is to add a KeyPressFcn to your app's UIFigure and use the event.Key in the callback to determine if escape was pressed:

function UIFigureKeyPress(app, event)
    key = event.Key;
    % Check if key == 'escape'
end

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Sai Sandeep Chigurupati 2024-5-6

24ce360e-770a-4ab1-8170-003528948a88.zip

Does the attached temp file give any clue?

Robert Philbrick 2024-5-7

@Sai Sandeep Chigurupati that zip file seems invalid as well and not recongized as a zip file. I would recommend that you contact customer support (https://www.mathworks.com/support/contact_us.html).

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