vc语言域名解析

nslookup example.com

ipconfig /flushdns

#include <iostream>
#include <winsock2.h>
#include <ws2tcpip.h>

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "WSAStartup failed." << std::endl;
        return 1;
    }

    struct addrinfo hints, *result = NULL;
    ZeroMemory(&hints, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    int res = getaddrinfo("example.com", "80", &hints, &result);
    if (res != 0) {
        std::cerr << "getaddrinfo failed: " << gai_strerror(res) << std::endl;
        WSACleanup();
        return 1;
    }

    struct sockaddr_in *ipv4 = (struct sockaddr_in *)result->ai_addr;
    char ipstr[INET_ADDRSTRLEN];
    inet_ntop(AF_INET, &(ipv4->sin_addr), ipstr, INET_ADDRSTRLEN);
    std::cout << "IP Address: " << ipstr << std::endl;

    freeaddrinfo(result);
    WSACleanup();
    return 0;
}