Python Tkinter多线程功能 [英] Python Tkinter Multithreading functions

问题描述

我目前正在使用python的tkinter库来处理电子邮件发件人和接收程序. 我正在使用线程模块使程序每60秒刷新一次未读的电子邮件，而您仍然可以继续在程序中执行操作.

I am currently working on an Email sender and recieving program with the tkinter library from python. I am using the threading module to make the program refresh the unread emails every 60 seconds while you can still continue doing stuff in the program.

仅在执行print("something")命令时，线程模块即可工作，我仍然可以继续在程序中进行操作.但是，当我使线程登录gmail并获取未读电子邮件计数时，整个程序将冻结并崩溃.

The threading module works when just making a print("something") command, and I can still continue doing stuff in the program. However, when I make the thread log into gmail and getting the unread email count, the whole program freezes and crashes.

下面是我的代码段.我不会发布完整的代码，我做了一个简短的版本来展示它的外观.

Below is a snippet of my code. I will not post the full code, I made a short version to show how it looks.

在功能上犯了一个小错误. get_credentials()已删除.

Made a small fault in the function. the get_credentials() is removed.

import tkinter, re, threading, time, imaplib, too many to list here.
class Application(Frame):

def __init__(self, parent):
        ... Start some functions
        ... Create some widgets
        ... Create some global stringvars for entry fields

def threadrefresh(self):#I want to start this function when a button is clicked

        def multithreading():

            usernamevar = "Username"
            passwordvar = "Password"

            obj = imaplib.IMAP4_SSL('imap.gmail.com', '993') #connect to gmail
            obj.login(usernamevar, passwordvar) #log in
            obj.select() #select the inbox
            unread = str(len(obj.search(None, 'UnSeen')[1][0].split())) #get the total unread
            print(unread)
            obj.close()

            time.sleep(3)
            multi = threading.Thread(target=multithreading)
            multi.start()

        multi = threading.Thread(target=multithreading)
        multi.start()

def other_functions_that_do_not_matter_in_this_case():
    ... Creating GUI
    ... Sending mail
    ... Etc.
    ... Create a button with function call self.threadrefresh


def main():
    root = Tk()
    app = Application(root)
    root.mainloop()

if __name__ == '__main__':
    main() 

推荐答案

此代码实际上正确吗?

您在多线程中调用它:

time.sleep(3)
multi = threading.Thread(target=multithreading)
multi.start()

您基本上是在告诉每个线程3秒后创建其自身的副本...我认为您错过了线程的要点.您可能应该有一个(单个)线程在while循环中运行，该线程从 Queue .

You are basically telling every thread to create a copy of itself after 3 seconds... I think you are missing the point of a thread. You should probably have a (single) thread running in a while loop that gets data from a Queue.

只要您希望线程对某物起作用，就将其添加到队列中.

Whenever you want the thread to act on something, you add it to the Queue.

示例代码

import threading
import Queue
import time

def f(q):
    while True:
        print q.get() #block thread until something shows up

q = Queue.Queue()
t = threading.Thread(target=f,args=[q])
t.daemon = True #if parent dies, kill thread
t.start()
for x in range(0,1000):
    q.put(x)
    time.sleep(1)

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