DNS網域名稱解析getaddrinfo替換gethostbyname，gethostbyname

DNS網域名稱解析getaddrinfo替換gethostbyname，gethostbyname

void DomainToIP(const char * host, const char *portStr, char *ip){        struct addrinfo hints, *res, *res0;        char str[32] = {0};                memset(&hints, 0, sizeof(hints));        hints.ai_family   = PF_UNSPEC;        hints.ai_socktype = SOCK_STREAM;        hints.ai_protocol = IPPROTO_TCP;        hints.ai_flags    = AI_PASSIVE;                int ret = getaddrinfo(host, portStr, &hints, &res0);        if (ret != 0) {            fprintf(stderr,"getaddrinfo: %s\n",                    gai_strerror(ret));<pre code_snippet_id="582093" snippet_file_name="blog_20150117_2_5030408" name="code" class="cpp">            return;        }                for(res = res0; res; res = res->ai_next){            if(res->ai_family == AF_INET){                // Found IPv4 address                inet_ntop(AF_INET,                          &(((struct sockaddr_in *)(res->ai_addr))->sin_addr),                          str, 32);                <span style="font-family: Arial, Helvetica, sans-serif;">printf</span><span style="font-family: Arial, Helvetica, sans-serif;">("解析出來的IP: %s\n", str);</span>                strncpy(ip, str, 32);            }else if(res->ai_family == AF_INET6){                // Found IPv6 address                inet_ntop(AF_INET6,                          &(((struct sockaddr_in *)(res->ai_addr))->sin_addr),                          str, 32);                printf("解析出來的IP6: %s\n", str);                strncpy(ip, str, 32);            }        }        freeaddrinfo(res0);    }