从gui启动和停止线程

Question

我目前正在开发一个带有GUI的程序，用于从传感器收集数据并在GUI中可视化。来自传感器的数据存储在一个列表中，用于进一步计算。

我目前正在尝试在一个新线程中启动日志记录过程。这将阻止GUI冻结。

我当前的代码：

import tkinter as tk
import time
import threading
class GUI:
def __init__(self, tk_object):
self.gui = tk_object
self.gui.title("Logger") 
self.gui.resizable(width=True, height=True)
self.testlabel = tk.Label(self.gui, text="Recording in process")
self.testlabel.grid(row = 7, column = 0)
self.testlabel.config(bg='white')
btn1 = tk.Button(master, text="Start Recording", width=16, height=5, command=lambda: self.start_functions())
btn1.grid(row=2,column=0)
btn2 = tk.Button(master, text="Stop Recording", width=16, height=5, command=lambda: self.stop_functions())
btn2.grid(row=3,column=0)
def start_functions(self):
"""Calls the method get_sample in a new thread and changes the bg-color of the label to red""" 
Thread_1 = threading.Thread(target=self.get_sample(), name='Thread1')        
Thread_1.start()
self.testlabel.config(bg='red') 
def stop_functions(self):
"""Stops all active threads and changes bg-color of the label back to white""" 
#stop_threads = threading.Event()
#stop_threads.set()
threading.Event().set()
self.testlabel.config(bg='white')            
def get_sample(self):
"""get data and append it to a list"""
while not threading.Event().is_set():
time.sleep(1)
res_cel.append(res_cel[-1]+1)
x_value.append(x_value[-1]+1)
print(res_cel)
print(x_value) 

master = tk.Tk()
master_object = GUI(master)
master.mainloop()

目前，get_sample方法包含一个占位符。我正试图通过Event()处理程序停止Thread1(get_sample方法在其中运行(。

while not threading.Event().is_set():

这似乎不正常。有更好的方法吗？在这种方法之前，我尝试使用class来处理线程(这是在stackoverflow上发现的，但我似乎再也找不到了，对不起(：

class Controller(object):
def __init__(self):
self.thread1 = None
self.stop_threads = Event()
def run(self):
.. do somehting

以及通过启动/停止线程

def starting_thread(self):
self.stop_threads.clear()
self.thread1 = Thread(target = self.run)
self.thread1.start()
def stopping_thread(self):
self.stop_threads.set()
self.thread1 = None

注意：这些函数在Controller类中。有了这个解决方案，我无法更改GUI类中的lables背景颜色，因为它不知道它引用的是什么对象

我是python编程的新手，所以如果有人能向我解释我在这里缺少了什么，我会很高兴。

谢谢xSaturn

Answer 1

你最好创建自己的Thread对象，并用一个方法来停止它。当线程离开其run方法时，它就会停止运行。看看下面的例子

import time
import tkinter as tk
from threading import Thread
class MyThread(Thread):
thread_running = False
def run(self):
k = 0
self.thread_running = True
while self.thread_running:
print(k)
k +=1
time.sleep(1)
print("thread ended")
def stop(self):
self.thread_running = False

class Window(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self.thread = None
tk.Button(self, text="launch thread", command=self.launch_thread)
.grid(row=1, column=0)
tk.Button(self, text="stop thread", command=self.stop_thread)
.grid(row=2, column=0)
def launch_thread(self):
if self.thread:
print("thread already launched")
else:
print("thread launched")
self.thread = MyThread()
self.thread.start()

def stop_thread(self):
if self.thread:
self.thread.stop()
self.thread = None
else:
print("no thread running")
if __name__ == '__main__':
win = Window()
win.mainloop()

有关详细信息，请参阅本主题有什么方法可以杀死线程吗？