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Close diary file on Error

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gire on 20 Jul 2012
Answered: Andrew Janke on 31 Jan 2020
Hi, I am using the diary function to log my application output. Something like
% all my code with output to the console, matrices written to desk, etc
diary off
When the code fails, the diary is not closed. One option would be to wrap all the code on a try-catch statement and close it on the catch.
Is there another way to avoid the diary being "open" when the app fails?

Accepted Answer

Jan on 20 Jul 2012
TRY-CATCH is really the best solution:
% all my code with output to the console, matrices written to desk, etc
catch ME
fprintf(1, 'ERROR:\n%s\n', ME.message);
diary off
This is clean an efficient, and you could insert other code for cleanup also, e.g. fclose('all').
  1 Comment
gire on 20 Jul 2012
I was hoping for another option because I do not like having all my code wrapped by try-catch. After some research and your answer I think this is the only option. Thanks :)

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More Answers (2)

Walter Roberson
Walter Roberson on 20 Jul 2012
onCleanup() might be appropriate for you.

Andrew Janke
Andrew Janke on 31 Jan 2020
The onCleanup function is what you want in modern Matlab. No try/catch to ugly up your code, and it's robust even against a dbquit.
function my_function
RAII.diary = onCleanup(@() diary('off'))
% ... now do whatever, and don't worry about closing the diary; it'll
% be automatically closed whenever this function returns for any reason...

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