python - How to kill a MATLAB Batch Process ran by Qt QProcess?

Question

I currently have a Python program that calls a MATLAB script as batch like so:

matlab = QProcess()
matlab.start('matlab -noFigureWindows -batch "cd(users/script_directory/); MyScript.m;"')
#^ command to start MATLAB batch process in CMD

The issue I'm running into is that once this batch process starts, there's no way to kill it. So if my Python app gets force-closed, the MATLAB script keeps running and causes all sorts of issues, meaning I need to kill the process on app close.

I'm calling the MATLAB script as a QProcess and get the following message when I force-close the Python app before the MATLAB script finishes executing:

QProcess: Destroyed while process ("matlab") is still running.

With this, how do I stop the batch MATLAB process? Using 'ctrl-c' in CMD works for me sometimes to kill the process but I need it to be consistent to make the Python work right.

Similarly, can I just have it 'force quit' or 'restart' batch MATLAB or anything along those lines to clear all running processes?

question from:https://stackoverflow.com/questions/65648588/how-to-kill-a-matlab-batch-process-ran-by-qt-qprocess

Answer 1

A brute force way to kill it would be to just kill any matlab process via the process and system utilities library at the start of your application:

import psutil

for process in psutil.process_iter():
    if process.name().lower() == 'matlab.exe':
        process.terminate()