TKinter - How to stop a loop with a stop button?

Question

I have this program which beeps every second until it\'s stopped. The problem is that after I press \"Start\" and the beeps starts, I cannot click the \"Stop\" button becaus

Answer 1

I used thread and global variable to fit your need. Not so complicated if you understand how they work. Just an addition of few lines and minor change to your existing line, and it works. Look through to see the changes made to your original code.

    #!/usr/bin/python
    import tkinter
    from tkinter import messagebox
    import time, winsound, msvcrt
    from threading import Thread

    running = True

    Freq = 2500
    Dur = 150

    top = tkinter.Tk()
    top.title('MapAwareness')
    top.geometry('200x100') # Size 200, 200

    def button_click():
        global running  #create global
        running = True

        # Create new thread
        t = Thread(target = start)
        # Start new thread
        t.start()

    def start():
        sec = 0
        while running:
            if running == False:
                break
            if sec % 1 == 0:
                winsound.Beep(Freq, Dur)

            time.sleep(1)
            sec += 1

    def stop():
        global running  #create global
        running = False

    startButton = tkinter.Button(top, height=2, width=20, text ="Start", command = button_click) #Change to call button_click instead start
    stopButton = tkinter.Button(top, height=2, width=20, text ="Stop", command = stop)

    startButton.pack()
    stopButton.pack()

    top.mainloop()