单片机怎么域名解析

#include "lwip/init.h"
#include "lwip/dns.h"

void dns_init(void) {
    struct ip_addr dns_server;
    IP4_ADDR(&dns_server, 8, 8, 8, 8); // 使用Google的公共DNS服务器

    dns_init();
    dns_setserver(0, &dns_server);
}

err_t dns_gethostbyname(const char *name, struct ip_addr *addr) {
    return dns_gethostbyname(name, addr, NULL, NULL);
}

int main() {
    lwip_init();
    dns_init();

    struct ip_addr ipaddr;
    err_t err = dns_gethostbyname("www.example.com", &ipaddr);

    if (err == ERR_OK) {
        printf("Resolved IP address: %d.%d.%d.%d\n",
               ip4_addr1(&ipaddr), ip4_addr2(&ipaddr),
               ip4_addr3(&ipaddr), ip4_addr4(&ipaddr));
    } else {
        printf("DNS resolution failed\n");
    }

    return 0;
}