客户端未在Python中接收数据

时间:2011-10-30 00:28:35

标签: python sockets client-server broken-pipe

我是Python的新手并且有一个基本问题,网络套接字连接的客户端是否可以接收数据?在我的问题中,客户端是启动连接的人,这可能很明显,但我想明确。我问,因为我有另一个服务器和客户端(都是python),允许服务器从客户端接收文件。它工作得很好,但我无法得到一个客户端收到文件的例子。 Python一直告诉我管道已经坏了,我怀疑它是因为在客户端我使用了行data = mysocket.recv(1024)。我怀疑客户端看不到任何数据流,从而关闭了与服务器的连接。服务器将其视为损坏的管道。服务器和客户端在下面。

服务器:

 #libraries to import
 import socket
 import os
 import sys
 import M2Crypto as m2c

 #information about the server the size of the message being transferred
 server_address = '10.1.1.2'
 key_port = 8888
 max_transfer_block = 1024

 FILE = open("sPub.pem","r")

 #socket for public key transfer
 keysocket = socket.socket( socket.AF_INET, socket.SOCK_STREAM)
 keysocket.bind((server_address, key_port))
 keysocket.listen(1)

 while 1:
         conn, client_addr = keysocket.accept()
         print 'connected by', client_addr
         #sends data to the client
         data = FILE.read()
         keysocket.sendall(data)
 keysocket.close()

客户端:

 # the specified libraries
 import socket
 import M2Crypto as m2c
 #file to be transferred
 FILE = open("test.txt", "r")
 #address of the server
 server_addr = '10.1.1.2'
 #port the server is listening on
 dest_port = 8888

 data = FILE.read()


 #Creates a socket for the transfer
 mysocket = socket.socket( socket.AF_INET, socket.SOCK_STREAM)
 mysocket.connect( (server_addr, dest_port) )

 data = mysocket.recv(1024)
 print data
 #creates a new file to store the msg
 name = "serverPubKey.pem"

 #opens the new file and writes the msg to it
 FILE = open (name, "w")
 FILE.write(data)


 #closes the socket.
 mysocket.close()

我很感激有关此事的任何帮助。谢谢!

2 个答案:

答案 0 :(得分:1)

在这样的应用程序中,绕过低级详细信息并使用socket.makefile代替更高级别的API有时会很有帮助。

在客户端关闭时,替换:

data = mysocket.recv(1024)

使用:

f = mysocket.makefile('rb')
data = f.read(1024)           # or any other file method call you need

source code for ftplib显示了如何在生产代码中执行此操作。

答案 1 :(得分:0)

此外,添加到之前的评论,有时候一个好的测试是重复接收几次。一次通过捕获服务器发送的信息的可能性不大。

类似这样的事情

nreceive = True#nreceive = Not Received
ticks = 0
f = None
while nreceive and ticks < 101:#try to get the info 100 times or until it's received
    ticks+=1
    try:
        f = mysocket.makefile('rb')
        if not f == None:
            nreceive = False
    except:
        pass
data = f.read(1024)