C++ 获取主机名字与主机IP

/* 编译环境: visual c++ */ 
#include <stdio.h> 
#include <winsock2.h> 
#pragma comment(lib,"ws2_32.lib") 

int doit(int, char **) 
{ 
char host_name[255]; 
//获取本地主机名称 
if (gethostname(host_name, sizeof(host_name)) == SOCKET_ERROR) { 
printf("Error %d when getting local host name.\n", WSAGetLastError()); 
return 1; 
} 
printf("Host name is: %s\n", host_name); 

//从主机名数据库中得到对应的“主机” 
struct hostent *phe = gethostbyname(host_name); 
if (phe == 0) { 
printf("Yow! Bad host lookup."); 
return 1; 
} 

//循环得出本地机器所有IP地址 
for (int i = 0; phe->h_addr_list[i] != 0; ++i) { 
struct in_addr addr; 
memcpy(&addr, phe->h_addr_list[i], sizeof(struct in_addr)); 
printf("Address %d : %s\n" , i, inet_ntoa(addr)); 
} 

return 0; 
} 

int main(int argc, char *argv[]) 
{ 
WSAData wsaData; 
if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0) { 
return 255; 
} 

int retval = doit(argc, argv); 

WSACleanup(); 

return retval; 
}

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