Question

我正在尝试使用新线程启动一个函数，每次启动该函数时，tkinter应用程序都会再次打开。为了让我看到运行的功能，我需要退出打开的新应用程序，然后启动它。我的代码中是否有一些东西再次调用应用程序并且在启动线程时不允许我的startReceive函数立即运行？

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％肯定，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

我认为您应该将self.threadExists = True放在之前的if。

中

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和多个线程

1 个答案: