Re: [pygame] Network

[Jan Ekholm <chakie@infa.abo.fi>]

On Mon, 10 Dec 2001, Leonardo Santagada wrote:

>I'm going to make it simple, how to do a networked game using python and 
>pygame? Does I have to use sockets? Isn't there any easier(like pygame 
>is to SDL) way to do it?

Use sockets. 

They aren't very hard to use. This is some ugly code that can maybe be
used as a template for the connecting. Personally I'd go with pure and
simple ASCII data, unless you have huge performance needs (you'd be using
C/C++ in that case). Making each packet one ASCII line makes it easy to
debug, and not necessarily slower than some weird binary format that'll be
a real pita when you have to debug it.

The code below seems to work ok for me, but I'm of course open for flames.


Client:
    # create the TCP socket
    sock = socket (AF_INET, SOCK_STREAM)

    # connect to the server
    sock.connect ( ( host, 10000 ) )

    # create a file
    file = sock.makefile ()

    # now we can read data from file using methods such as readline() on
    # file. writing can be done by using the send() method on sock. To
    # wait for data use select(), see below.


Server:

    # create the TCP socket
    s = socket (AF_INET, SOCK_STREAM)

    # bind our socket for incoming requests
    s.bind ( ( '', 10000 ) )

    # listen for clients
    s.listen ( 5 )

    # perform the select that waits for an incoming client. We're only
    # interested in incoming events. wait forever (set a last parameter if
    # you want to timeout 
    incoming, out, ex = select.select ( [s], [], [])

    # did we get a new incoming client?
    if s in incoming:
       # we have a new client on the socket
       clientsocket, addr = s.accept ()

    # now we can start serving the client
    file = clientsocket.makefile ()

    # read a line of ascii data
    for line in file.readline ():
       # handle the data somehow
       handle ( line )

   
-- 
    - "Remember -- that which does not kill us can only make us stronger."
    - "And that which does kill us leaves us dead!"
                                           -- Terry Pratchett, Carpe Jugulum

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