#include "winsock.h"

#include <stdio.h>

#define TRUE 1

/* 这个程序建立一个套接字，然后开始无限循环；每当它通过循环接收到一个连接，则打印出一个信息。当连接断开，或接收到终止信息，则此连接结束，程序再接收一个新的连接。命令行的格式是：streams */



void main( )

{

         int sock, length;

         struct sockaddr_in server;

         struct sockaddr tcpaddr;

         int msgsock;

         char buf[1024];

         int rval, len;



         /* 建立套接字 */

         sock = socket(AF_INET, SOCK_STREAM, 0);

         if (sock < 0) {

                   perror("opening stream socket");

                   exit(1);

         }

         

         /* 使用任意端口命名套接字 */  

         server.sin_family = AF_INET;

         server.sin_port = INADDR_ANY;

         if (bind(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {

                   perror("binding stream socket");

                   exit(1);

         }

         

         /* 找出指定的端口号并打印出来 */

         length = sizeof(server);

         if (getsockname(sock, (struct sockaddr *)&server, &length) < 0) {

                   perror("getting socket name");

                   exit(1);

         }

         printf("socket port #%d\n", ntohs(server.sin_port));



         /* 开始接收连接 */

         listen(sock, 5);

         len = sizeof(struct sockaddr);

         do {

                   msgsock = accept(sock, (struct sockaddr *)&tcpaddr, (int *)&len);

                   if (msgsock == -1)

                            perror("accept");

                   else do{

                            memset(buf, 0, sizeof(buf));

                            if ((rval = recv(msgsock, buf, 1024,0)) < 0)

                                     perror("reading stream message");

                            if (rval == 0)

                                     printf("ending connection \n");

                            else

                                     printf("-->%s\n", buf);

                   }while (rval != 0);
                  closesocket(msgsock);

         } while (TRUE);

         

         /* 因为这个程序已经有了一个无限循环，所以套接字"sock"从来不显式关闭。然而，当进程被杀死或正常终止时，所有套接字都将自动地被关闭。*/

         exit(0);

}

编译正常
但是构件exe时
ocket.obj : error LNK2001: unresolved external symbol _closesocket@4
socket.obj : error LNK2001: unresolved external symbol _recv@16
socket.obj : error LNK2001: unresolved external symbol _accept@12
socket.obj : error LNK2001: unresolved external symbol _listen@8
socket.obj : error LNK2001: unresolved external symbol _ntohs@4
socket.obj : error LNK2001: unresolved external symbol _getsockname@12
socket.obj : error LNK2001: unresolved external symbol _bind@12
socket.obj : error LNK2001: unresolved external symbol _socket@12
Debug/socket.exe : fatal error LNK1120: 8 unresolved externals
Error executing link.exe.

socket.exe - 9 error(s), 0 warning(s)