C++获取域名IP

#https://blog.csdn.net/dosthing/article/details/80383817

std::string ip = "www.baidu.com";
struct hostent stHostent;
struct hostent *pstHostent = nullptr;
char **pptr = nullptr;
char buf[2048] = "\0";
sprintf(buf,"%s", "ip");
int iError;
if((pstHostent = gethostbyname(buf)) == NULL || pstHostent->h_addr_list == NULL || pstHostent->h_addr_list[0] == NULL)
{
    std::cout << "can't parse the domain" << std::endl;
    exit(0);
}
else
{
    std::cout << "official hostname: " << pstHostent->h_name << std::endl;
    for(pptr = pstHostent->h_aliases; *pptr != NULL; pptr++)
    std::cout << "alias: " << *pptr << std::endl;
    switch(pstHostent->h_addrtype)
    {
    case AF_INET:
    case AF_INET6:
    pptr = pstHostent->h_addr_list;
    for(; *pptr!=NULL; pptr++)
    printf("address:%s\n",inet_ntop(pstHostent->h_addrtype, *pptr, buf,64));
    printf("first address: %s\n",inet_ntop(pstHostent->h_addrtype, pstHostent->h_addr,buf,64));
    break;
    default:
    printf("Unkown address type\n");
}
}