python - 基于socket的简单python聊天程序

Question

我正在编写一个简单的基于套接字的聊天程序，允许服务器向客户端发送和接收消息。客户端可以向服务器发送消息，但是当我尝试从服务器发送消息时，它崩溃并提示"file"对象具有属性“recv”。

服务器.py

import socket
import os
import select
import sys

def prompt():
    sys.stdout.write('<You> ')
    sys.stdout.flush()

try:
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except:
    print 'Failed to create socket'
    sys.exit()

PORT = 9050
HOST = '127.0.0.1'
RECV_BUFFER = 4096

server_socket.bind((HOST, PORT))
server_socket.listen(10)

input = [server_socket, sys.stdin]

print 'Chat Program'
prompt()

while 1:

    inputready, outputready, exceptready = select.select(input,[],[])

    for sock in inputready:

        if sock == server_socket:
            client, address = server_socket.accept()
            input.append(client)
            #data = sock.recv(RECV_BUFFER)
            #if data:
                #sys.stdout.write(data)
        else:
            data = sock.recv(RECV_BUFFER)
            if data:
                sys.stdout.write(data)
            else:
                msg = sys.stdin.readline()
                server_socket.send('\r<Server>: ' + msg)
                prompt()



server_socket.close()

客户端.py

import socket
import os
import select
import sys

def prompt():
   sys.stdout.write('<You> ')
   sys.stdout.flush()

HOST = '127.0.0.1'
PORT = 9050
try:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except socket.error:
    print 'Failed to create socket'
    sys.exit()

s.connect((HOST, PORT))

print 'Connected to remote host. Start sending messages'
prompt()

while 1:

    socket_list = [sys.stdin, s]

    read_sockets, write_sockets, error_sockets = select.select(socket_list, [], [])

    for sock in read_sockets:
        if sock == s:
            data = sock.recv(4096)
            if not data:
                print '\nDisconnected from chat server'
                sys.exit()
            else:
                sys.stdout.write(data)
                prompt()
        else:
            msg = sys.stdin.readline()
            s.send('\r<Client>: ' + msg)
            prompt()

Answer 1

好吧，在你的服务器中你正在做(缩写)

input = [server_socket, sys.stdin]
inputready, outputready, exceptready = select.select(input,[],[])
for sock in inputready:
    if sock == server_socket:
        ...
    else:
        data = sock.recv(RECV_BUFFER)

所以当 sys.stdin 上有东西进来时，它不是 server_socket 所以它会转到 else 并尝试 recv ，但它不是套接字。 stdin 应该使用 read 而不是 recv。像下面这样的结构对我来说最有意义。

if sock == server_socket:
    ...
elif sock == sys.stdin:
    data = sock.readline()
    for s in input:
        if s not in (server_socket, sys.stdin):
            s.send(data)
else:
    ...