UDP Socket 客户端没有收到来自服务器的消息

Question

这是服务器代码 python

from socket import *


serverPort = 12000

serverSocket = socket(AF_INET, SOCK_DGRAM)

serverSocket.bind(('', 12000))

print(" the server is ready to receive")

while 1:
     message, clientAddress = serverSocket.recvfrom(2048)
     modifiedMessage = message.upper()
serverSocket.sendto(modifiedMessage, clientAddress)

客户端代码为

from socket import * 
serverName = '127.0.0.1'
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_DGRAM)
message = input ('Input lowercase sentense:')
clientSocket.sendto(message.encode(),(serverName, serverPort))
modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
print (modifiedMessage)
clientSocket.close()

我运行服务器首先输出的是

enter image description here

然后我运行client输入小写的那句之后client和server什么都不做

enter image description here

请帮助我。

Answer 1

您的问题在这里：

while 1:
    message, clientAddress = serverSocket.recvfrom(2048)
    modifiedMessage = message.upper()
serverSocket.sendto(modifiedMessage, clientAddress)`

Python 中的缩进很重要。您的服务器进程永远不会到达第三条语句，因为它在技术上位于无限循环结束之后。

UDP Socket 客户端没有收到来自服务器的消息

UDP Socket the client does not recieve a message from server

python

sockets

network-programming