How to make matlab show line of error in appdesigner

Question

Noah Kilps 2020-11-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/644483-how-to-make-matlab-show-line-of-error-in-appdesigner

评论： Noah Kilps 2020-11-11

采纳的回答： Jon

在 MATLAB Online 中打开

Hello,

I have created an app, and in my code it creates a message box when there is an error.

try
    % A bunch of lines of code
catch ME2
if (strcmp(ME2.identifier,'MATLAB:catenate:dimensionMismatch'))
   msg2 = ['An error was found in this loop'];
   causeException2 = MException('MATLAB:myCode:dimensions',msg2);
   ME2 = addCause(ME2, causeException2); % this is the error that would stop the code
else
end
   disp(ME2) % we are displaying the error so that we can still identify the problem if we have an error
   msgbox(['MAINTENANCE NEEDED. CONTACT SHOKEN MODE. ' ME2.message ' See line ' sprintf('%g', ME2.stack.line) '.'],'FYI') % informs the auditor which file failed the loop
end

I want the message box to say what line the error occurred. It works perfectly fine when I run this script not as an app. In app designer I get this weird result where the line number (713300??) should be:

Is it possible for appdesigner to tell me what line the error was at?

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Answer 1

Jon 2020-11-11

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/644483-how-to-make-matlab-show-line-of-error-in-appdesigner#answer_541353

编辑：Jon 2020-11-11

在 MATLAB Online 中打开

I see in the documentation that "stack is an N-by-1 struct array, where N represents the depth of the call stack"

Is it possible that you need to further index

sprintf('%g', ME2.stack.line)

maybe

sprintf('%g', ME2.stack(1).line)

In any case I would suggest going in with the debugger and setting a break point on the line where the anaomolous line number is printed and investigate exactly what is in ME2.stack and while you are in there experiment on the command line to see how to get it to print out properly