当我在客户端套接字上使用'recv()'时，我的python程序死机了，我该如何解决? [英] My python program freezes when I use 'recv()' with my client socket, how could I fix it?

问题描述

我正在尝试使用套接字，tkinter等制作一个邮件应用程序.启动该程序时，它在加载屏幕后冻结.它没有显示任何错误，只是冻结了.我调试了它，然后找出错误"在哪里.我尝试使用 setblocking()或 settimeout()等，但是没有任何效果.也许是tkinter的问题?这是我的客户端脚本和服务器脚本中最重要的部分

I'm trying to make a mail app, using socket, tkinter, etc. When I launch the program, it freezes after the loading screen. It doesn't show any error, just freezes. I debugged it, and found out where the 'error' was. I've tried using setblocking() or settimeout(), etc, but nothing worked. Maybe tkinter is the problem? Here are the most important parts of my client script, and server script

客户

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

[...]

def after():
    client_socket.connect((IP, PORT))

    while True:
        msg = client_socket.recv(HEADER) # It freezes here (I found out it was here by debugging)

        try:
            msg = msg.decode(FORMAT)
        except Exception:
            msg = pickle.loads(msg)

        if msg:
            pass

def load_win():
    loading_bar.pack_forget()
    loading_title.pack_forget()
    loading_frame.pack_forget()

    main_label.pack()

    log_in_button.pack(pady=30)
    sign_in_button.pack()

    main_frame.pack(expand=YES)

    win.geometry('720x480')
    win.minsize(720, 480)
    win.config(bg='#3D3D3D')
    win.after(0, after)

def load_bar():
    loading_bar['value'] += loading_bar['length'] // 100

def load():
    total_nbr = 0
    for x in range(100):
        randint = random.randint(1000, 5000)
        total_nbr += randint
        loading_bar.after(randint, load_bar)

    win.after(total_nbr//100, load_win)

[...]

win.after(0, load)
win.mainloop()

服务器

[...]

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

server_socket.bind((IP, PORT))
server_socket.listen()

[...]

while True:
    client_socket, client_address = server_socket.accept()

    [...]

    while True:
        msg = None

        try:
            msg = client_socket.recv(HEADER)
        except Exception:
            break

        try:
            msg = msg.decode(FORMAT)
        except Exception:
            msg = pickle.loads(msg)

        if msg == 'get_clients':
            client_socket.send(pickle.dumps(clients))

推荐答案

也许是因为在 msg = client_socket.recv(HEADER)中，方法 recv()是阻止代码，代码会暂停，直到 recv()收到消息，然后转到下一行代码.

Maybe it is because in msg = client_socket.recv(HEADER) the method recv() is a blocking code and the code is paused until recv() recieves a message and then goes to next lines of code.

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