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

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.

[dpb]

More than likely you're not using a fully-qualified file name and the installed location of the .exe isn't in the same place as the MATLAB function/script.

[Walter Roberson]

dbp is right.

See also https://www.mathworks.com/help/compiler/ctfroot.html

Answer 1

[Muhammed Yaseen]

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