Tutorial: Sockets

The first thing you need to do is import the sockets module
import sockets
Then you need to create and initialize a TSocket object
<nowiki>var s: TSocket = socket()</nowiki>
After that you can use s.connect("addr", TPort(80)) to connect to a server
Once you connect to a server, you can send and receive messages to/from the server by using s.send("Message") to send, and s.recv() to receive.
== Examples ==
= IRC Bot =

import sockets, strutils
when not defined(strutils.toStringSep):

    proc toStringSep(x: int64): string = 

        var s = $x

        result = ""

        var j = 0

        for i in countdown(len(s)-1, 0): 

            inc(j)

            if j == 4: 

                result = ‘,’ & result 

                j = 0

            result = s[i] & result
proc toMiB(size: int64): int64 =

    return size div 1024 div 1024
proc formatSize(size: int64): string =

    var gigabytes: int64 = size div 1024 div 1024 div 1024

    var megabytes: int64 = size.toMiB()

    var kilobytes: int64 = size div 1024

    if gigabytes != 0:

        return toStringSep(gigabytes) & “GB”

    elif megabytes != 0:

        return toStringSep(megabytes) & “MB”

    elif kilobytes != 0:

        return toStringSep(kilobytes) & “KB”

    else:

        return toStringSep(size) & “B”
var s = socket()
s.connect(“irc.freenode.net”, TPort(6667))
s.send(“NICK NimrodBot\c\L”)

s.send(“USER NimrodBot * 0 :IRC Bot programmed in Nimrod!\c\L”)
while True:

  var data: string = ""

  discard s.recvLine(data)

  echo(data)

  if data.split()0 == “PING”:

    s.send("PONG " & data.split()1 & “\c\L”)

  if data.split()1 == “001”:

    s.send(“JOIN #nimrod\c\L”)

  if data.split()1 == “PRIVMSG”:

    if data.split()3 == “:!about”:

      var msg = "NimrodBot 0.1 compiled on " & CompileDate & " " & CompileTime

      msg.add(" running on " & hostOS)

      s.send("PRIVMSG " & data.split()2 & " :" & msg & “\c\L”)
elif data.split()3 == “:!mem”:
var msg = "Occupied memory: " & formatSize(int64(getOccupiedMem()))
s.send("PRIVMSG " & data.split()2 & " :" & msg & “\c\L”)
elif data.split()3 == “:!freemem”:
var msg = "Free memory: " & formatSize(int64(getFreeMem()))
s.send("PRIVMSG " & data.split()2 & " :" & msg & “\c\L”)
elif data.split()3 == “:!totalmem”:
var msg = "Total memory: " & formatSize(int64(getTotalMem()))
s.send("PRIVMSG " & data.split()2 & " :" & msg & “\c\L”)