mfc通过域名得到ip

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

#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;
    }

    const char* domain = "www.example.com";
    struct hostent* host = gethostbyname(domain);
    if (host == NULL) {
        std::cerr << "gethostbyname failed: " << WSAGetLastError() << std::endl;
        WSACleanup();
        return 1;
    }

    struct in_addr addr;
    memcpy(&addr, host->h_addr_list[0], sizeof(struct in_addr));
    char ip[INET_ADDRSTRLEN];
    inet_ntop(AF_INET, &addr, ip, INET_ADDRSTRLEN);

    std::cout << "IP address of " << domain << " is " << ip << std::endl;

    WSACleanup();
    return 0;
}