如何从iOS上的主机名获取IP

Question

如何从iOS上的给定主机名获取IP？

我试过谷歌,但一无所获.

Answer 1

以下代码适用于IPv4和IPv6.它用于getaddrinfo()检索主机的IP地址列表,getnameinfo()并将每个IP地址转换为字符串.(为简洁起见,省略了错误检查.)

struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;        // PF_INET if you want only IPv4 addresses
hints.ai_protocol = IPPROTO_TCP;

struct addrinfo *addrs, *addr;

getaddrinfo("www.google.com", NULL, &hints, &addrs);
for (addr = addrs; addr; addr = addr->ai_next) {

    char host[NI_MAXHOST];
    getnameinfo(addr->ai_addr, addr->ai_addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST);
    printf("%s\n", host);

}
freeaddrinfo(addrs);