域名解析2则

下面是2则域名解析的例子

void CView::HostNameToIP(CString strhostName)  //域名解析为IP地址
{
 char pURL[]="http://www.163.com/";  
 struct hostent *hp;
 int k;
 char **p;
 hp = gethostbyname(pURL);
 if(hp==NULL) {return; }
 for (p = hp->h_addr_list; *p ; p++) //循环显示所有IP
 {
  char *sIP;
  sIP = inet_ntoa(*(struct in_addr*)*p);
  CString strIP = sIP;
 }
}

//域名解析出ip
//如果想获取本机ip，则把name置null
lpctstr jsocket::getipstr(char * name)
{
 char szhostname[256];

 if (!name)
 {
  if (gethostname(szhostname, sizeof(szhostname))==0)
   name = szhostname;
  else
   return 0;
 }

 hostent *he;
 if ((he = gethostbyname(name)) == null)
 {
  // if failed, try using gethostbyaddr instead

  unsigned long ip = inet_addr(name);
 
  if (ip == inaddr_none)
   return null;

  if ((he = gethostbyaddr((char *)&ip,sizeof(ip),af_inet)) == null)
   return null;
 }
 return inet_ntoa (*(struct in_addr *)he->h_addr_list[0]);
}