- 1 year ago
cx_freeze tkinter application not working with multiprocessing in Windows
When using cx_Freeze to package a Tkinter application with multiprocessing on Windows, you may encounter issues due to the way Python handles multiprocessing and the behavior of frozen applications. This is a known limitation of cx_Freeze and Python on Windows.
The problem arises because multiprocessing creates new processes by importing the main module again. However, when cx_Freeze freezes a Python application, the __main__
module is modified, and this can cause conflicts and errors when using multiprocessing.
To work around this issue, you can use the freeze_support()
function from the multiprocessing
module, which is specifically designed to address the problem of freezing multiprocessing-aware applications. It is crucial to call freeze_support()
at the beginning of your script, before any other imports or code that might spawn child processes.
Here's how you can modify your Tkinter application script to include the necessary freeze_support()
call:
pythonimport multiprocessing
import tkinter as tk
def worker():
# Your multiprocessing worker function here
pass
def main():
root = tk.Tk()
# Your Tkinter application code here
root.mainloop()
if __name__ == '__main__':
# Call freeze_support() before importing any other modules
multiprocessing.freeze_support()
# Start your main function
main()
By adding the multiprocessing.freeze_support()
call before the main function is executed, you should be able to run the frozen application without issues.
Additionally, make sure that you are using the appropriate version of cx_Freeze that is compatible with your Python version. Always use the latest version of cx_Freeze to ensure better compatibility and fewer issues.
Keep in mind that freezing a Tkinter application with multiprocessing can still be challenging due to underlying system differences and complexities, so some issues might still arise. If you encounter any other problems, it's best to thoroughly test the frozen application and consult the cx_Freeze documentation or community for further assistance.