C++将域名转换成ip地址

• 使用gethostbyname，返回值的结构如下：

struct hostent
{
char *h_name;
char **h_aliases;
int h_addrtype;
int h_length;
char **h_addr_list;
#ifdef __USE_MISC
# define h_addr h_addr_list[0]
#endif
};

#include   // gethostbyname
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

int main()
{
		struct hostent* phost = gethostbyname("www.baidu.com");
		char* ip;
		if (NULL == phost)
	    {
	    	cout << "gethostbyname error : " <<  errno << " : " << strerror(errno) << endl;
	    	return -1;
	    }
		//inet_ntop(phost->h_addrtype,  phost->h_addr, ip, 17);
		for(int i=0; phost->h_addr_list[i]; i++) {
			ip = inet_ntoa( *(struct in_addr*)phost->h_addr_list[0] );
			cout << ip << endl;
		}
		return 0;
}