On 14/04/12 17:41, Khalid Al-Ghamdi wrote:
1- In line (15), what are these variables tcpCliSock,addr supposed to
hold and do?
The socket object and the IP address of the client that is connecting to
the server. When a client connects to a server the server assigns a new
temporary socket connection that the client uses. Each connection gets
a new temporary socket assignment. What happens to the old one is
implementation dependent and you should not try to reuse it.
2- Why do I have to specify the buffer size and what does it mean?
A buffer is an area of memory used as a kind of holding bay into which
data is put, usually temporarily. You need to specify where the incoming
data will go and how much space you expect to use.
3- When I try to run the below code and its corresponding client it
works ok for the first time, but then it gives me this error:
Traceback (most recent call last):
File "C:\Python32\Khalid Stuff\tsTserv3.py", line 12, in <module>
tcpSerSock.bind(ADDR)
socket.error: [Errno 10048] Only one usage of each socket address
(protocol/network address/port) is normally permitted
I thought it had to do with the address so I changed the port and it
worked ok. so,:
A/ isn't the optional tcpSerSock.close() supposed to close the
connection for later reuse?
Yes, but there is sometimes a delay before the OS cleans up, it may be
that which you are seeing.
B/ why is it when i go to the IDLE and enter tcpSerSock.close() and it
accepts it, it still gives the same error and doesn't close the
connection for reuse by my code?
It may be an OS level thing. But I'm by no means an expert on the OS
networking layers! Which OS are you running under?
HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR =(HOST, PORT)
tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)
while True:
print('waiting for connection ...')
tcpCliSock, addr = tcpSerSock.accept()
print('...connected from: ', addr)
while True:
data = tcpCliSock.recv(BUFSIZ)
if not data:
break
tcpCliSock.send(bytes('[{}]
{}'.format(ctime(),data.decode('utf-8')),'utf-8'))
tcpCliSock.close()
tcpSerSock.close()
I can't help but think you should check if there actually is a
connection before starting the second loop... What do you expect
if the accept() fails to find anything?
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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