How to access the error line number where an error occurred with try/catch MException? App Designer

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Marcel Rapp
Marcel Rapp 2024-9-17
回答： Jaimin 2024-9-17
Hi,
I've developed an App Designer App and incorporated try-catch statements to enhance stability. Now, I aim to display information about where an error occurred. To achieve this, I have the following structure:
ErrorInfo = 'DeleteDataButtonPushed';
try
%Code to be executed
catch ME
DisplayErrorMsg(app, ErrorInfo, ME);
end
function DisplayErrorMsg(app, ErrorInfo, ME)
MsgError = ME.message;
MsgId = ME.identifier;
MsgLine = ME.stack.line; % ME.stack.line contains sometimes more than one line
Msg = ['Error in Line ' MsgLine newline MsgError newline MsgId newline ErrorInfo newline app.ErrorMsg];
uiwait(msgbox(Msg,"Error","error"));
end
My Problem is: ME.stack.line contains sometimes more than one line:
ME.stack.line
ans =
263
ans =
4275
ans =
62
How to access the imformation in the second row/ans?
Things that I tried:
ME.stack
ans =
3×1 struct array with fields:
file
name
line
size(ME.stack.line)
ans =
1 1
ME.stack.line(2) -- Intermediate dot '.' indexing produced a comma-separated list with 3 values, but it must produce a single value when followed by subsequent indexing operations.
ME.stack.line{2}-- Intermediate dot '.' indexing produced a comma-separated list with 3 values, but it must produce a single value when followed by subsequent indexing operations.
Msg = getReport(ME); finds all the lines, but the text it generates is huge and not very practical.
Thanks for your support!

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回答（1 个）

Jaimin
Jaimin 2024-9-17
Hello @Marcel Rapp
To display all error messages using the “msgbox” function, iterate through all error lines from “ME.stack” array.
I have attached a sample code for better understanding.
function DisplayErrorMsg(app,ErrorInfo, ME)
MsgError = ME.message;
MsgId = ME.identifier;
% Initialize an empty string to store line information
MsgLines = '';
% Iterate over each element in the ME.stack array
for i = 1:length(ME.stack)
% Append each line number to the MsgLines string
MsgLines = [MsgLines, num2str(ME.stack(i).line), ' '];
end
% Construct the full error message
Msg = ['Error in Lines: ' MsgLines newline ...
'Error Message: ' MsgError newline ...
'Error ID: ' MsgId newline ...
'Error Info: ' ErrorInfo];
% Display the error message in a message box
uiwait(msgbox(Msg, "Error", "error"));
end
I hope this will be helpful.

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