[Tutor] Socket Programming issue

[Mark Tolonen]

"aditya" <nauty.me04 at gmail.com> wrote in message 
news:BANLkTikS+gzm=89tHCZpbWKSd+wUfeC7mA at mail.gmail.com...
> This is a small client-server program in which i am using a Vbscript 
> program
> to check for connectivity of 2 machines and write the output to a text 
> file
> whether it connectes or not ,
>
>
> for example the contents of the file *output.txt* are
>
> 192.168.1.2 is connected
> 192.168.1.10 is not connected
>
>
> Now i am trying to send the contents of this file from a client through a
> socket to a server which is running on my main server .This is basically
> created to automate the checking of connectivity of the machines. The 
> issue
> is that although the Vbscript writes the output to the file correctly but
> when the client sends the contents of the file to the server via socket , 
> it
> sometimes prints all the lines of the file on the server and sometimes it
> doesnt , i dont know whether the issue is with the client or the server ,
> Please Help..
>
>
> CLIENT.PY
>
> import socket
> import os
> import sys
> os.system("C:\Python26\ping.vbs")
> host = "localhost"
> port= 23333
> size = 1024
>
> s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> s.connect((host,port))
>
>
>
>
> f=open('output.txt','r')
> while 1:
> data = f.readline()
> if data: s.send(data)
> else: break



Use "s.sendall(data)" instead of send to correct the error Alan pointed out.



>
>
>
> f.close()
>
> s.close()
>
>
>
> SERVER.PY
>
>
> import socket
>
> host = ""
> port = 23333
> size = 1024
> backlog=5
> s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>
> s.bind((host,port))
> s.listen(backlog)
>


s.accept() should be before the while loop, then loop on recv until the 
client closes the connection.  Since TCP is a streaming protocol, recv() 
could receive less than a line or more than one line at once, but with the 
accept inside the loop the script will pause waiting for a different client 
to connect, and won't continue reading the data from the original client.

-Mark




> while 1:
> client, addr =s.accept()
> data=client.recv(size)
> if data:
> print data
>
> else:
> print  "client exit"
>
> s.close()
>
>
>
>
>
>
>
>
>
> -- 
> Regards
> Aditya
>


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