Re: client-server application question

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Presumably your server already stores a list of connected
clients, at the very least that's the list of sockets it maintains.
If it doesn't you should change it so it does. You can use
getpeername to get the IP addres and port number of the
peer (client) for each socket.

Every thread i create when a new client arrives adds a new entry in a
map object.

As far as how many of these are alive - you can't get away
from active keep-alive pinging, since a TCP connection
with no data flowing can silently break at any time with
no indication for either peer until attempted data transmission
fails.
This means that from time to time I should send data and wait for a
responce? I thought of that, but what if the connection speed with some
clients is small? Wouldn't that affect my process? How much time sould
I wait for an answer from the client? If I wait for all clients
responces and some client doesn't answer?

As for your design with a thread per client - this is very
inefficient for a client, but it is a pure disaster for a server.
Learn about the other socket models offered by WinSock.
For a server the ultimate model is overlapped I/O using
I/O Completion Port (IOCP).

How can I find out more about that? Please give me some links!

.

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