program Server;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  Winsock,
  Windows;

type
  TParam=record
    TrdId:integer;
    Sckt:TSocket;
  end;

//子线程函数
function ChildThrd(p:Pointer):LongInt;stdcall;
var
  PkLen:integer;
  ThreadId:integer;
  ASocket:TSocket;
  buf:array[0..63] of char; 
begin
  Result:=0;
  ThreadId:=TParam(p^).TrdId;
  ASocket:=TParam(p^).Sckt;
  Writeln('Thread '+IntToStr(ThreadId)+' Create'); 
  PkLen:=1;
  while PkLen>0 do
  begin
    FillChar(buf,SizeOf(buf),0);
    PkLen:=Recv(ASocket,buf,SizeOf(buf),0);  //接收数据
    Write(buf);
    if PkLen>0 then
    begin
      Send(ASocket,buf,PkLen,0);//发送数据
    end;
  end;
  CloseSocket(ASocket); //关闭socket
  Dispose(p);
  Writeln('Thread '+IntToStr(ThreadId)+' End');
  Writeln('Socket '+IntToStr(ASocket)+' DisConnect');
end;

//主程序
var
  MyWSA: WSAData;
  Svr,Clt: TSockAddr;
  NameLen:Integer;
  hSocket,s: TSocket;
  TimeOut:integer;
  ThreadCount:integer;
  hThread:Thandle;
  ThreadID:DWord;
  Param:^TParam;  
begin
  If WSAStartup(MAKEWORD(2,2), MyWSA) <> 0 Then  //初始化
  Begin
    WSACleanup;
    Writeln('WSAStartup() Fail');
    Exit;
  end;
  hSocket := Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); //创建socket
  If hSocket = INVALID_SOCKET Then
  Begin
    WSACleanup;
    Writeln('Socket() Fail');
    Exit;
  End;
  Svr.sin_family := AF_INET;
  Svr.sin_port := htons(176); //server端口号为176
  Svr.sin_addr.S_addr := inet_addr(PChar('127.0.0.1'));//server的ip地址为127.0.0.1
  If Bind(hSocket, Svr, SizeOf(Svr)) = SOCKET_ERROR Then  //绑定socket
  Begin
    CloseSocket(hSocket);
    WSACleanup;
    Writeln('Bind() Fail');
    Exit;
  end;
  if Listen(hSocket,256) = SOCKET_ERROR Then  //socket开始侦听,最大同时连接数为256个
  begin
    CloseSocket(hSocket);
    WSACleanup;
    Writeln('Listen() Fail');
    Exit;
  end;
  TimeOut:=3000;
  ThreadCount:=0;
  Writeln('Listening......');
  while true do
  begin
    NameLen:=SizeOf(Clt);
    s:=Accept(hSocket,@Clt,@NameLen);//接受一个连接
    if s = SOCKET_ERROR Then
    begin
      CloseSocket(hSocket);
      WSACleanup;
      Writeln('Accept() Fail');
      Exit;
    end
    else
    begin
      Writeln('Socket '+IntToStr(s)+' Connect');
      if SetSockOpt(s,SOL_SOCKET,SO_RCVTIMEO,PChar(@TimeOut),SizeOf(TimeOut))=SOCKET_ERROR then //设置接收超时为3秒
      begin
        CloseSocket(s);
        CloseSocket(hSocket);
        WSACleanup;
        Writeln('SetSockOpt() Fail');
        Exit;
      end;
      if SetSockOpt(s,SOL_SOCKET,SO_SNDTIMEO,PChar(@TimeOut),SizeOf(TimeOut))=SOCKET_ERROR then //设置发送超时为3秒
      begin
        CloseSocket(s);
        CloseSocket(hSocket);
        WSACleanup;
        Writeln('SetSockOpt() Fail');
        Exit;
      end;
      new(Param);
      Param^.TrdId:=ThreadCount;
      Param^.Sckt:=s;
      hThread:=CreateThread(nil,0,@ChildThrd,Param,0,ThreadID); //创建childthrd子线程
      if hThread=0 then
      begin
        Writeln('CreateThread() Fail');
      end
      else
      begin
        Inc(ThreadCount);
      end;
    end;
  end;
  CloseSocket(hSocket); //关闭socket
  WSACleanup;
end.

//源码下载 http://ono.3322.org/mysoft/serversocket.zip