//注意要引用WinSock2的lib文件,否则编译不会通过

#include <WINSOCK2.H>

#include <stdio.h>

int main(int argc,char** argv)

{

 WSADATA wsaData;

 char HostName[256];

 hostent* HostEnt;

 protoent* ProtoEnt;

 in_addr** Addr;

 char* IPAddr;

 SOCKET Socket;

 sockaddr_in Sin;

 SOCKET AcceptSocket;

 

 //初始化WinSock

 if(WSAStartup(MAKEWORD(2,2),&wsaData))

 {

  printf("Init WinSock failed!\n");

  return 1;

 }

 //获取主机名

 gethostname(HostName,256);

 printf("%s\n",HostName);

 //获取主机信息

 HostEnt=gethostbyname(HostName);

 printf("%s\n",HostEnt->h_name);

 

 //枚举主机IP地址列表

 Addr=(in_addr**)HostEnt->h_addr_list;

 while(*Addr)

 {

  IPAddr=inet_ntoa(**Addr);

  printf("%s\n",IPAddr);

  Addr++;

 }

 

 //建立Socket

 

 ProtoEnt=getprotobyname("TCP");

 

 Socket=socket(AF_INET,SOCK_STREAM,ProtoEnt->p_proto);

 if(Socket<0)

 {  

  printf("Socket error!");

  return 2;

 }

 

 //绑定Socket

 Sin.sin_port=htons(23);

 Sin.sin_family=AF_INET;

 Sin.sin_addr.s_addr=0;

 if(bind(Socket,(sockaddr*)&Sin,sizeof(Sin)))

 {

  printf("%s\n","Socket error!");

  return 3;

 }

 //侦听请求

 if(listen(Socket,1))

 {

  printf("%s","Socket error!");

  return 4;

 }

 

 //

 while (1)

 {

  AcceptSocket=SOCKET_ERROR;

  while(AcceptSocket==SOCKET_ERROR)

  {

   AcceptSocket=accept(Socket,(sockaddr*)&Sin,NULL);

     }

  printf( "Client Connected.\n");

  break;

 }

 char msg[]="\r\n==Connected!==\r\n";

 printf("%d\n",send(AcceptSocket,msg,strlen(msg),0));

 //关闭Socket收发功能

 shutdown(AcceptSocket,0);

 closesocket(AcceptSocket);

 closesocket(Socket);

 //取消被阻塞的Socket

 if(WSAIsBlocking()) WSACancelBlockingCall();

 

 //释放WinSock资源

 WSACleanup();

 

 return 0;

}