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这里绝对是新手，我似乎无法找到我的问题的答案。运行 python 2.7。

我的服务器代码如下：

#UDPPingerClient.py
from socket import *

#Create a UDP socket
clientSocket = socket(AF_INET, SOCK_DGRAM)
#Assign IP address and port number to socket
clientSocket.bind(("127.0.0.1",9501))

#Set a timeout value of 1 second
clientSocket.settimeout(1)

msg = "test"

#the server info
sIP = "127.0.0.1"
sPort = 12007
addr = (sIP,sPort)

a = 10

# the server will automatically drop some messages
# so we send 10 to make sure it gets there and then
# listen for a response from the server
while a > 0:
    clientSocket.sendto(msg,addr)
    try:
        received, server = clientSocket.recvfrom(1024)
        print received
    except timeout:
        print ('an error occured')

    a = a - 1

服务器代码：

# UDPPingerServer.py 
# We will need the following module to generate randomized lost packets 
import random 
from socket import * 

# Create a UDP socket 
# Notice the use of SOCK_DGRAM for UDP packets 
serverSocket = socket(AF_INET, SOCK_DGRAM) 
# Assign IP address and port number to socket 
serverSocket.bind(("127.0.0.1", 12007)) 

while True: 
    # Generate random number in the range of 0 to 10 
    rand = random.randint(0, 10) 
    # Receive the client packet along with the address it is coming from 
    message, address = serverSocket.recvfrom(1024) 
    # Capitalize the message from the client 
    message = message.upper()
    12 # If rand is less is than 4, we consider the packet lost and do not respond
    if rand < 4:
        continue 
    # Otherwise, the server responds 
    serverSocket.sendto(message, address)

到目前为止，我还没有得到服务器的回复。我能够完成的最多是在收到此错误之前发送一次并超时：

an error occured <-- output from exception

Traceback (most recent call last):
  File "C:/Python27/UDPPingerClient.py", line 23, in <module>
    received, server = clientSocket.recvfrom(1024)
error: [Errno 10054] An existing connection was forcibly closed by the remote host

这个的重现性是 100%，这是我每次运行服务器文件和客户端文件时的结果。打开或关闭防火墙也是如此。我觉得这与例外有关，但我不能完全理解为什么。

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1 回答 1

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这是我得到的输出：

foggy@dew ~ $ python UDPPingerClient.py 
TEST
TEST
an error occured
TEST
TEST
TEST
an error occured
TEST
an error occured
TEST

正好十条消息，有些已经超时，有些则被传回。除了 Server 中 rand 行上方的额外 12 之外（这不会打扰解释器），我看不出代码有什么问题。

于 2013-10-12T22:10:13.677 回答