int main()
{
   WORD wVersionRequested = MAKEWORD(1, 1);
   WSADATA wsaData;
   if (WSAStartup(wVersionRequested, &wsaData)) {
      printf("WSAStartup failed %s\n", WSAGetLastError());
      return -1;
   }
   char hostname[128];
   int res = gethostname(hostname, sizeof(hostname));
   if (res != 0) {
      printf("Error: %u\n", WSAGetLastError());
      return -1;
   }
   printf("hostname=%s\n", hostname);
   hostent* pHostent = gethostbyname(hostname);
   if (pHostent==NULL)
  {
      printf("Error: %u\n", WSAGetLastError());
      return -1;
   }

   hostent& host = *pHostent;
   sockaddr_in sain;
   for (int ilen=0;host.h_addr_list[ilen];ilen++)
  {
      memcpy ( &sain.sin_addr.s_Sun, host.h_addr_list[ilen],host.h_length);
      printf("Address: %s\n", inet_ntoa(sain.sin_addr));   
   }
   WSACleanup();
   return 0;
}     


空间不能用`借个位置记录下