I've done some network programming mostly with TCP and I don't think
that the way the client connects to the server is a lot different (if
any), The only difference is when you must decide the protcol family.
"socket.SOCK_DGRAM" will be for UDP and "socket.SOCK_STREAM" will be for
TCP. After this, the client can connect the same way.
Here is a simpler sample than the one Kent gave:
"""
from socket import *
HOST = 'localhost'
PORT = 3001
BUFSIZ = 1024
ADDR = (HOST, PORT)
tcpCliSock = socket(AF_INET, SOCK_STREAM) # change here for UDP
tcpCliSock.connect(ADDR)
while 1:
data = raw_input('>') # Enter text to be transmitted to the server.
if not data: break
tcpClisock.send(data)
data = tcpCliSock.recv(BUFSIZ)
if not data: break
print data
tcpCliSock.close()
"""
HTH,
Johan
Kent Johnson wrote:
> Carroll, Barry wrote:
>
>> Yes, that is exactly what I want. I need to write a program that
>> communicates with an existing server, using the UDP protocol. This
>> is my first time writing such a program, and I need help getting
>> started.
>
>
> Here is an example from Python Network Programming, by John Goerzen.
> It opens a UDP port, sends a message, then echoes any received text to
> the console. There is no higher-level support built in to Python, you
> just open a datagram socket and push data out. Google for "Python udp"
> for more examples.
>
> Kent
>
> #!/usr/bin/env python
> # UDP Example - Chapter 2
>
> import socket, sys, time
>
> host = sys.argv[1]
> textport = sys.argv[2]
>
> s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
> try:
> port = int(textport)
> except ValueError:
> # That didn't work. Look it up instread.
> port = socket.getservbyname(textport, 'udp')
>
> s.connect((host, port))
> print "Enter data to transmit: "
> data = sys.stdin.readline().strip()
> s.sendall(data)
> s.shutdown(1)
> print "Looking for replies; press Ctrl-C or Ctrl-Break to stop."
> while 1:
> buf = s.recv(2048)
> if not len(buf):
> break
> print "Received: %s" % buf
>
>
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