close the file with Callback in simulink

Question

Dhruvilkumar Chavada 2022-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/1843753-close-the-file-with-callback-in-simulink

回答： Suman 2022-11-7

Hello,

I am using command system('path &') to open a bin file before starting my simulation. (adding this under model properties)

I want to close the same file after completion of my simulation. I tried with fclose('path') under closefcn in model properties but its not working.

Could you tell me how can i close the file with callback function.

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Answer 1

Suman 2022-11-7

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Hi Dhruvilkumar,

As per my understanding, you have opened a ".bin" file using "system(path)" and want to close it automatically after the simulation completes.

The issue, I believe, is with the "system()" operation. The "system()" operation takes a command as parameter and waits for the command to finish execution before returning the exit status. So, "system()" will not stop its execution until the .bin file is closed manually in the background. Please have a look at the following documentation for reference:

system() documentation - MATLAB

Also, "fclose()" expects a File ID as its input parameter which is generated when a file is opened with "fopen()".

Therefore, I suggest you to use "fopen()" to open the .bin file and use "fclose()" in "CloseFcn" callback to automatically close the file after simulation. Please refer to the documentations below:

fclose() documentation - MATLAB

fopen() documentation - MATLAB

I hope the above information is helpful to you.

Cheers,

Suman