Sockets

[Hugo Martires]

Peter Hansen <peter at engcorp.com> wrote in message news:<3BC50853.505C8641 at engcorp.com>...
> Hugo Martires wrote:
> > 
> > My server need to send 2 strings separeted:
> >  s1= 'xxx'
> >  s2= 'yyy'
> > 
> > My client must received like this:
> >  rec1= 'xxx'
> >  rec2= 'yyy'
> > 
> > The problem is that the Client received s1 and s2 in one only string.
> > 
> > How can i received in 2 separeted variables ?
> 
> I note the other answers, and still feel the need to point out two
> things.
> 
> 1. When asking questions of this sort, it is *always* advisable
>    to post sample code showing what you are trying to do. 
>    If you don't, the answers are just guesses (maybe educated ones,
>    but still guesses).
> 
> 2. Assuming you are opening a socket between the two programs, 
>    my (educated :-) guess is that you are doing a pair of socket.send()
>    calls with the two strings, and expecting these two be 
>    received *separately* with two recv() calls on the other end.
>    If this is so, you misunderstand how sockets and TCP/IP and
>    such work.  Nowhere in the documentation will you find any
>    guarantee that the data from two consecutive send() calls
>    matches up with the two recv() calls.  They might be lumped
>    together so that you get 'xxxyyy' after the first recv().
>    You might have to use four recv() calls and get 'x', 'x',
>    'xxy' and finally 'yy'.  No guarantees.  Don't ever assume
>    you have all the data just because recv() returns.
> 
>    And that's the reason behind John's suggestion of disabling
>    the Nagel algorithm, since it *might* appear to solve the
>    problem.  Don't be fooled: it's a very fragile, hackish
>    way of "fixing" the problem, and not suitable for "real"
>    programs in most cases.  (Standard anti-flame disclaimers
>    apply...)

///////////////////////////////////////////////////////
OK there's my code:

*----------- Server ----------------------*

#!/usr/bin/env python

from socket import *
from cga_dp import *


# input
n=10
s=4
g=10

param=[n , s , g] 


HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)


vp=get_vp()

SerSock = socket(AF_INET, SOCK_STREAM)
SerSock.bind(ADDR)
SerSock.listen(5)

while(1):
    
    CliSock, addr = SerSock.accept()
    
	
    CliSock.send(repr(param))
    CliSock.send(vp) 

    CliSock.close()
  

SerSock.close()


*----------- Client -------------------*

#!/usr/bin/env python

from socket import *


HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

CliSock = socket(AF_INET, SOCK_STREAM)
CliSock.connect(ADDR)

while(1):
	data = CliSock.recv(BUFSIZ)
	if not data: break
	???????????????????	

CliSock.close()	

******************************
My problem is : what i put in ???????????????
Some people told me to use a delimeter betwen the 2 strings. 
But how can i use it? How to decode the whole string ?
Tanks