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gethostbyname 函数本身不直接支持 IPv6 地址解析
要在代码中使用 getaddrinfo，请参考以下示例：
#include<stdio.h> #include <stdlib.h> #include<string.h> #include <netdb.h> #include <arpa/inet.h> #include <sys/types.h> #include <sys/socket.h> int main(int argc, char *argv[]) { struct addrinfo hints, *res, *p; int status; char ipstr[INET6_ADDRSTRLEN]; if (argc != 2) { fprintf(stderr, "Usage: %s hostname\n", argv[0]); exit(1); } memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; // AF_INET or AF_INET6 to force version hints.ai_socktype = SOCK_STREAM; if ((status = getaddrinfo(argv[1], NULL, &hints, &res)) != 0) { fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status)); exit(1); } printf("IP addresses for %s:\n\n", argv[1]); for (p = res; p != NULL; p = p->ai_next) { void *addr; char *ipver; // get the pointer to the address itself, // different fields in IPv4 and IPv6: if (p->ai_family == AF_INET) { // IPv4 struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr; addr = &(ipv4->sin_addr); ipver = "IPv4"; } else { // IPv6 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr; addr = &(ipv6->sin6_addr); ipver = "IPv6"; } // convert the IP to a string and print it: inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr); printf("%s: %s\n", ipver, ipstr); } freeaddrinfo(res); // remember to free the memory allocated by getaddrinfo return 0; } 这个示例程序将输入的主机名解析为 IPv4 和 IPv6 地址。如果你只想解析特定版本的地址，可以通过修改 hints.ai_family 来实现。
