同时发送/接收消息socket python

问题描述 投票:3回答:3

我一直在一个简单的python套接字聊天室,客户端和服务器可以相互发送消息。我遇到的问题是服务器和客户端一次只能发送一条消息。我希望它像任何其他聊天室一样工作,在我发送消息时我可以收到消息,任何帮助都会有很大帮助

Server.py

import socket
import sys

s = socket.socket()
host = socket.gethostname()
print(" server will start on host : ", host)
port = 8080
s.bind((host,port))
name = input(str("Please enter your username: "))
print("")
print("Server is waiting for incoming connections")
print("")
s.listen(1)
conn, addr = s.accept()
print("Recieved connection")
print("")
s_name = conn.recv(1024)
s_name = s_name.decode()
print(s_name, "has joined the chat room")
conn.send(name.encode())

while 1:
    message = input(str("Please enter your message: "))
    conn.send(message.encode())
    print("Sent")
    print("")
    message = conn.recv(1024)
    message = message.decode()
    print(s_name, ":" ,message)
    print("")

Client.py

import socket
import sys

s = socket.socket()
host = input(str("Please enter the hostname of the server : "))
port = 8080
s.connect((host,port))
name = input(str("Please enter your username : "))
print(" Connected to chat server")

s.send(name.encode())
s_name = s.recv(1024)
s_name = s_name.decode()
print("")
print(s_name, "has joined the chat room ")

while 1:
    message = s.recv(1024)
    message = message.decode()
    print(s_name, ":" ,message)
    print("")
    message = input(str("Please enter your message: "))
    message = message.encode()
    s.send(message)
    print("Sent")
    print("")
python sockets send recv
3个回答
2
投票

CaSper给了我服务器代码,其中多个客户端可以连接到服务器但现在的问题是客户端无法相互通信...

这主要是因为你的客户想要s_name = s.recv(1024),而CaSper的服务器不发送它的名字。这是您的客户端的变体(期望主机和端口作为命令参数),它与CaSper的服务器一起使用,并且还通过使用单独的线程解决您的原始问题(客户端一次只能发送一条消息):

import socket
import sys

s = socket.socket()
s.connect((sys.argv[1], int(sys.argv[2])))
name = input(str("Please enter your username : "))
print(" Connected to chat server")
s.send(name.encode())

def receive_and_print():
    for message in iter(lambda: s.recv(1024).decode(), ''):
        print(":", message)
        print("")
import threading
background_thread = threading.Thread(target=receive_and_print)
background_thread.daemon = True
background_thread.start()

while 1:
    s.send(input("Please enter your message: ").encode())
    print("Sent")
    print("")

请注意,CaSper的服务器存在一系列缺陷:

  1. 即使现在您的客户端可以随时发送消息,服务器也会等待来自一个客户端的消息,i。即当它等待客户端A时,客户端B可以发送消息,但服务器只有在客户端A发送了一些内容后才接收并广播它。
  2. 它不处理客户端断开连接。
  3. 当所有客户端断开连接时,它会进入忙碌循环。

有关更好的服务器示例,请参阅问题Handle multiple requests with select

...你可以改变我的服务器,以便工作......

这是您的服务器的一个变体,它与此客户端一起使用,也使用单独的线程进行输入和接收:

import socket
import sys

s = socket.socket()
host = socket.gethostname()
print(" server will start on host : ", host)
port = 8080
s.bind((host,port))
name = input(str("Please enter your username: "))
print("")
print("Server is waiting for incoming connections")
print("")
s.listen(1)
conn, addr = s.accept()
print("Recieved connection")
print("")
s_name = conn.recv(1024)
s_name = s_name.decode()
print(s_name, "has joined the chat room")

def input_and_send():
    while 1:
        message = name+" : "+input(str("Please enter your message: "))
        conn.send(message.encode())
        print("Sent")
        print("")
import threading
background_thread = threading.Thread(target=input_and_send)
background_thread.daemon = True
background_thread.start()

for message in iter(lambda: conn.recv(1024).decode(), ''):
    print(s_name, ":", message)
    print("")

0
投票

您是否尝试使用线程模块或时间模块。这是因为两个脚本同时发送消息。尝试Ex(客户端等待消息从服务器frist,然后客户端发送消息到服务器)。


-2
投票

这是服务器

import socket
import threading as th

def accept_client():
    while True:
        # ACCEPTING    
        cli_sock, cli_add = ser_sock.accept()
        uname = cli_sock.recv(1024)
        CONN_LIST.append((uname, cli_sock))
        print('%s is now connected' %uname)

def broadcast_usr():
    while True:
        for i in range(len(CONN_LIST)):
            try:
                data = CONN_LIST[i][1].recv(1024)
                if data:
                    b_usr(CONN_LIST[i][1], CONN_LIST[i][0], data)
            except Exception as x:
                print(x.message)
                break

def b_usr(cs_sock, sen_name, msg):
    for i in range(len(CONNECTION_LIST)):
        if (CONN_LIST[i][1] != cs_sock):
            CONN_LIST[i][1].send(sen_name)
            CONN_LIST[i][1].send(msg)


if __name__ == "__main__":    
    CONN_LIST = []

    # SOCKET
    ser_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    # BINDING
    host = '192.168.x.x' #LOCAL HOST
    port = 4444
    ser_sock.bind((host, port))

    # LISTENING    
    ser_sock.listen(1)
    print('Chat server started on port : ' + str(port))

    thread_ac = th.Thread(target = accept_client)
    thread_ac.start()

    thread_bs = th.Thread(target = broadcast_usr)
    thread_bs.start()
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