invalid file identifier. use fopen to generate a valid file identifier

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Guillermo Arias
Guillermo Arias 2021-8-13
回答： Muhammed Yaseen 2021-8-17
Hi, I have a problem with extracting data from my main code. I generated a .exe archive and I want to extract some data to a .txt archive. When I run the code in Maltab it works perfectly but in the .exe I got the error message: invalid file identifier. use fopen to generate a valid file identifier.
How can I fix it?. Thank you very much.

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回答（1 个）

Muhammed Yaseen
Muhammed Yaseen 2021-8-17
This is due to the fact that all deployed applications look for a file relative to the "ctfroot", unless the file has been packaged along with the application while compiling it.
As a workaround, use the entire path of the file as the argument to the "fopen" command as shown below:
>> [FileName,PathName] = uigetfile('*.csv')
>> fullpath = [PathName FileName];
>> fid = fopen(fullpath);
The file identifier would now be valid.
For more details on "ctfroot", you can refer this link.
https://www.mathworks.com/help/compiler/ctfroot.html

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