嘗試使用 PySimpleGUI 退出 While True 循環

Question

這是我的代碼：

主要.py：

import PySimpleGUI as sg
import Config
import threading


def main():
    layout = [  [sg.Text('Real Time Raspberry Pi Sniffer')],
            [sg.Button('Run While Loop'), sg.Button('Exit')],     # a couple of buttons
            [sg.Output(size=(60,15))] ]         # an output area where all print output will go
            #[sg.Input(key='_IN_')] ]             # input field where you'll type command

    window = sg.Window('Realtime Shell Command Output', layout)

    while True:            # Event Loop
        event, values = window.Read()
        if event == 'Run While Loop':             
            t1 = threading.Thread(target = Config.whileLoop())
            t1.start()
        elif event == 'Exit' or event == WIN_CLOSED:
            print('CLICKED EXIT') 
            window.Close()

if __name__ == '__main__':
    main()

配置文件

from PySimpleGUI.PySimpleGUI import WIN_CLOSED
def whileLoop():
    state = True
    while (state == True):          
        print("It works!")  

我正在嘗試創建在用戶單擊按鈕時運行 while 循環的 GUI 窗口（在這種情況下，當他們單擊“Run While Loop”時）。 但是，我遇到了一個問題，因為我的代碼卡在了 Config.py 中的嵌套 while 循環中。 我希望代碼能夠退出 while 循環並在單擊“退出”按鈕時由程序停止。 我研究了線程，不知道還能做什么。 有什么幫助，謝謝！

Answer 1

我導入在Config.py中定義的類Func ，然后調用實例Func()的方法while_loop 。 為 while 循環是否繼續運行設置一個標志 True 或 False。

示例代碼

# Config.py

from time import sleep
from PySimpleGUI import WIN_CLOSED


class Func():

    def __init__(self):
        self.state = False
        self.count = 0

    def while_loop(self, window):
        while self.state:
            sleep(0.5)                                      # Simulate job done here
            self.count += 1
            window.write_event_value("Done", self.count)    # update GUI by event

# main.py

from time import sleep
from threading import Thread
import PySimpleGUI as sg
import Config


def main():

    layout = [
        [sg.Text('Real Time Raspberry Pi Sniffer')],
        [sg.Button('Start'), sg.Button('Stop'), sg.Button('Exit')],
        [sg.StatusBar('', size=60, key='Status')],
    ]
    window = sg.Window('Realtime Shell Command Output', layout, enable_close_attempted_event=True)
    status = window['Status']
    func = Config.Func()
    thread = None
    while True:

        event, values = window.read()

        if event in (sg.WINDOW_CLOSE_ATTEMPTED_EVENT, 'Exit'):
            func.state = False
            sleep(0.5)  # Wait thread to stop
            break
        elif event == 'Start' and thread is None:
            func.state = True
            func.count = 0
            thread = Thread(target=func.while_loop, args=(window,), daemon=True)
            thread.start()
        elif event == 'Stop':
            func.state = False
            thread = None
        elif event == 'Done':
            count = values[event]
            status.update(f"Job done at #{count:0>3}")

    window.Close()

if __name__ == '__main__':
    main()

Answer 2

這是一個猜測，因為我之前沒有做過你正在嘗試的事情。

也許如果你改變你的 config.py 是這樣的：

state=True
def whileLoop():
   while (state == True):          
       print("It works!") 

（使 state 成為模塊全局標志）

並修改您的事件循環，如：

while True:            # Event Loop
    event, values = window.Read()
    if event == 'Run While Loop':             
        t1 = threading.Thread(target = Config.whileLoop)
        t1.start()
    elif event == 'Exit' or event == WIN_CLOSED:
        print('CLICKED EXIT') 
        Config.state = False # set the exit flag
        t1.join() # I'm not sure about this, could try without
        window.Close()

同樣，我已經使用 Python 很長時間了，但從來沒有這樣。

Answer 3

就在這里： t1 = threading.Thread(target = Config.whileLoop())
您在設置線程變量時調用了 Config.whileLoop()。 您必須改為t1 = threading.Thread(target = Config.whileLoop)
它實際上並沒有調用目標函數Config.whileLoop 。 t1.start()實際上會調用它。