winsock 获机本机ip

#include <stdio.h>

#include <winsock2.h>

 

#pragma comment(lib,"ws2_32.lib")  //winsock 2.2 library

 

// 获取本机ip,winsock

// 来源于网络

 

typedef struct  {

  char    FAR * h_name;            

  char    FAR * FAR * h_aliases;   

  short   h_addrtype;              

  short   h_length;               

  char    FAR * FAR * h_addr_list;

}  hostent ;

 

 

int main()

{

char host[100];

hostent *local;

//Initialise Winsock

WSADATA wsock;

if (WSAStartup(MAKEWORD(2,2),&wsock) != 0)

{

fprintf(stderr,"WSAStartup() failed");

        exit(EXIT_FAILURE); 

} 

 

gethostname(host,sizeof(host));

local = (hostent*)gethostbyname(host);

printf("name=%s\naliases=%s\naddrtype=%d\nlength=%d\n",

      local->h_name, local->h_aliases, local->h_addrtype, local->h_length);

printf("IP Address : %s\n",inet_ntoa(*((struct in_addr *)local->h_addr))); 

 

if (WSACleanup() == SOCKET_ERROR)

    {

      printf("WSACleanup failed with error %d\n", WSAGetLastError());

    }

return 0;

}