#include <winsock2.h> #include <stdio.h> #pragma comment(lib,"ws2_32.lib")void main() { WSADATA wsadata; WORD dwVersionRequested; int err; err=WSAStartup(dwVersionRequested,&wsadata); char hostname[128]; if(gethostname(hostname,128)==0) {   printf("%s/n",hostname);//計算機名字 } char buf[20];//memset(buf,0,80);struct hostent *pHost = gethostbyname(hostname);for (int i = 0; pHost != NULL && pHost->h_addr_list[i] != NULL; i++) {    //將它放入字符數組中便于應用  strcpy(buf,inet_ntoa(*(struct in_addr *)pHost->h_addr_list[i]));  //inet_ntoa(*(struct in_addr *)pHost->h_addr_list[i]);  //IP地址  printf("%s/n",buf);} WSACleanup(); }