通过套接字发送和接收数组 [英] Sending and Receiving arrays via Sockets

问题描述

是否可以使用 Python 通过 UDP 套接字发送数组?我正在使用 Python 2.5 并尝试发送一个简单的数组，但它不起作用.它可以成功发送数组，但是当我尝试使用数组中的一个项目打印它时，程序崩溃了.我不确定错误是什么，因为我采取了将数据转换为数组的预防措施，但它不起作用.希望我尽可能清楚地解释了这个问题.我将不胜感激！

Is it possible to send an array through UDP Sockets using Python? I am using Python 2.5 and trying to send a simple array but it's not working. It can send the array successfully but when I try to print it with an item of the array the program crashes. I'm not sure what the error is as I take the precaution of converting the data into an array but it's not working. Hope I explained the problem as clearly as possible. I would appreciate the help!

# Client program

from socket import *
import numpy
from array import*

# Set the socket parameters
host = "localhost"
port = 21567
buf = 4096
addr = (host,port)

# Create socket
UDPSock = socket(AF_INET,SOCK_DGRAM)

def_msg = "===Enter message to send to server===";
print "\n",def_msg
a = array('i',[1,3,2])
# Send messages
while (1):
    data = raw_input('yes or now')
    if data!= "yes":
        break
    else:
        if(UDPSock.sendto(a,addr)):
            print "Sending message"

# Close socket
UDPSock.close()



# Server program

from socket import *

# Set the socket parameters
host = "localhost"
port = 21567
buf = 4096
addr = (host,port)

# Create socket and bind to address
UDPSock = socket(AF_INET,SOCK_DGRAM)
UDPSock.bind(addr)

# Receive messages
while 1:
    data,addr = UDPSock.recvfrom(buf)
    L = eval(data)
    if not data:
        print "Client has exited!"
        break
    else:
        print "\nReceived message '", L[1],"'"

# Close socket
UDPSock.close()

推荐答案

eval 正在做与您想象的完全不同的事情.

eval is doing something completely different than what you think.

要通过网络发送数据，您需要将其序列化成一个字节数组，然后反序列化返回.在 Python 中，大多数对象的序列化可以通过 pickle 模块完成:

To send data over network, you need to serialize it into an array of bytes, then deserialize it back. In Python, serialization of most objects can be done via pickle module:

if (UDPSock.sendto( pickle.dumps(a), addr)):

反序列化:

data,addr = UDPSock.recvfrom(buf)
L = pickle.loads(data)
print repr(L) # prints array('i', [1, 3, 2])

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