Kent, Johan: Thank you. These examples will be a great help. I also found some links via Google (I always forget that resource for some reason). I have enough to go forward, now.
Barry > -----Original Message----- > From: Johan Geldenhuys [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 01, 2005 11:39 AM > To: Kent Johnson > Cc: Carroll, Barry; 'tutor@python.org' > Subject: Re: [Tutor] Talking to UDPServer > > 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 > > > > _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
