Permission to write into text file

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Tino 2019-7-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470865-permission-to-write-into-text-file

评论： Tino 2019-7-9

采纳的回答： Jan

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Hello

I got the following error below:

Permission denied : I am unable to open file mojo.txt

find the code below

function savechangeptsButtonPushed(app, event)
            writematrix(app.UITable.Data, 'mojo.txt')
        end
    end

What do I do to solve the issue

Thanks in advance

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Guillaume 2019-7-9

Another possibility is that the file is already opened (with write access) by some other program. In any case, matlab just asks the OS to open the file for write access. It's the OS that tells matlab it's not possible. Nothing matlab can do anything about.

dpb 2019-7-9

"...Nothing matlab can do anything about."

Other than trap the OS error and report it which may (or may not) be more informative to the user than just "I can't do that!" and die.

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采纳的回答

Jan 2019-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/470865-permission-to-write-into-text-file#answer_382533

编辑：Jan 2019-7-9

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Do not use 'mojo.txt' as file name without a path. Remember, that any GUI or timer callback could call cd to change the current folder unexpectedly.

function savechangeptsButtonPushed(app, event)
folder = tempdir;  % Insert your preferred folder here
file   = fullfile(folder, 'mojo.txt');
try
  writematrix(app.UITable.Data, file);
catch ME
    error(['Cannot create file: %s', newline, '%s'], file, ME.message);
end
end