How can I know which file identifiers correspond to open files?

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MathWorks Support Team
编辑： Josh Kahn 2023-6-9
I have opened a file using FOPEN and processed it. A few lines of code later, there was an error, and the file wasn't closed properly.
I would like to know which file identifiers correspond to open files so I can close them using FCLOSE.

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采纳的回答

MathWorks Support Team
To see the list of identifiers of all open files you can use the following command:
fids = fopen('all')
To see the file names which correspond to those file identifiers you can use the following command:
filenames = arrayfun(@fopen, fids, 'UniformOutput', 0)
Finally, if you just want to close all open files you can use the following command:
fclose('all')

更多回答（1 个）

Josh Kahn
Josh Kahn 2023-6-9
编辑：Josh Kahn 2023-6-9
Also, if you want to avoid this, you can now use a cleanup object to close the file when the function is done (error or normal) similar to a try/catch.
For more information, see:
https://www.mathworks.com/help/matlab/ref/oncleanup.html
function myFunction
fid = fopen('myFile.txt', 'w')
cleanup = onCleanup(@() fclose(fid));
fprintf(fid, 'hello!');
end
equivalent to:
function myFunction
fid = fopen('myFile.txt', 'w')
try
fprintf(fid, 'hello!');
fclose(fid);
catch ME
fclose(fid);
rethrow(ME);
end
end

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