tkinter 和多线程

Question

我正在尝试使用新线程启动一个函数，每次我启动该函数时，tkinter 应用程序都会再次打开。为了让我看到功能运行ning 我需要退出打开的新应用程序然后它启动。我的代码中是否有某些东西再次调用应用程序并且不允许我的 startReceive 函数在我启动线程时立即运行？

import tkinter as tk
from udpTransfer1 import UdpClass
from threading import Thread
from tkinter import messagebox
import multiprocessing, time, signal

class Application(tk.Frame):
    def __init__(self, master=None):
        super().__init__(master)
        self.alert = ''
        self.pack()
        self.alive = False
        self.create_widgets()
        self.c = UdpClass()
        self.threadExists= False
        self.st = None

    def create_widgets(self):
        # 1 button
        self.hi_there = tk.Button(self)
        self.hi_there["text"] = "Save UDP"
        self.hi_there["command"] = self.run
        self.hi_there.pack(side="top")

        # 2 button
        self.b2 = tk.Button(self)
        self.b2["text"] = "Stop UDP"
        self.b2["command"] = self.b2Action
        self.b2.pack(side="top")

        # 3 button
        self.quit = tk.Button(self, text="QUIT", fg="red")
        self.quit["command"] = self.kill
        self.quit.pack(side="bottom")

    def kill(self):
        if self.threadExists == True:
            # Alert Box
            # self.alert = messagebox.showinfo("ALERT").capitalize()
            self.alert = messagebox._show(None,'UDP has to be stopped first!')
        else:
            root.destroy()

    def run(self):
        # self.st = Thread(target=self.c.startReceive)
        # self.st = multiprocessing.Process(target=self.c.startReceive)
        self.st = multiprocessing.Process(target=startReceive)
        self.st.start()
        if (self.st.is_alive()):
            print("Thread open")
        self.threadExists = True

    def b2Action(self):
        if self.threadExists:
            # self.c.terminate()
            terminate()
            self.st.terminate()
            time.sleep(.1)
            if not(self.st.is_alive()):
                print("Thread Killed")
            self.threadExists = False
        else :
            self.alert = messagebox._show(None, 'No Detection of UDP Running!')

def startReceive():
    print('started')
    try:
        isRunning = True
        # csvfile = open(self.filename, 'w')
        # spamwriter = csv.writer(csvfile, delimiter=',', quotechar='|', quoting=csv.QUOTE_MINIMAL)
        # start_time = time.time()
        while isRunning:
            print('done')
            time.sleep(1)
    except:
        print('out')


def terminate():
    # self.socket.close()
    # isRunning = False
    print('stopped')

root = tk.Tk()
app = Application(master=root)
app.master.title("UDP Saving")
app.master.geometry('200x200')
app.master.maxsize(200, 500)
app.mainloop()

Answer 1

不是 100% 确定，但这可能是问题所在：

def run(self):

    # self.st = Thread(target=self.c.startReceive)
    # self.st = multiprocessing.Process(target=self.c.startReceive)
    self.st = multiprocessing.Process(target=startReceive)
    self.st.start()
    if (self.st.is_alive()):
        print("Thread open")

    self.threadExists = True

我认为你应该把 self.threadExists = True 放在前面的 if 里。

def run(self):

    # self.st = Thread(target=self.c.startReceive)
    # self.st = multiprocessing.Process(target=self.c.startReceive)
    self.st = multiprocessing.Process(target=startReceive)
    self.st.start()
    if (self.st.is_alive()):
        print("Thread open")

        self.threadExists = True

tkinter 和多线程

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