REBOL [ file: %tcpserver.r title: "TCP Server" author: "Semseddin (Endo) Moldibi" version: 1.0.0 date: 2010-07-28 purpose: "Opens a TCP port and accepts multiple client connections." Library: [ level: 'intermediate platform: 'all type: [how-to tools] domain: 'tcp tested-under: [view 2.7.7.3.1 on "WinXP Pro"] support: "semseddin/at/gmail.com" license: 'public-domain see-also: none ] ] if not empty? port-number: ask "TCP Port number? " [ ;Open server port server: open/no-wait join tcp://: port-number print reform ["Port" port-number "opened."] ;list of ports to wait wait-for: make block! 10 ;first one is server, rest will be clients append wait-for server forever [ ;wait for multiple clients AND server for new connections which: wait wait-for either which = server [ ;add the newly connected client to the wait list append wait-for first which print reform ["New client connected, number of active clients:" (length? wait-for) - 1] ] [ ;print the incoming message comes from the Nth client either msg: copy which [ print reform [ "New message from client" (index? find wait-for which) - 1 ":" msg ] ] [ ;remove the disconnected client from the wait list print reform [ "Client" (index? find wait-for which) - 1 "disconnected" ] remove find wait-for which ] ] ] ]