C/C++ 根据域名获取IP地址

转载：https://blog.csdn.net/what951006/article/details/78803995  

通过域名获得具体的ip地址

#include 
#pragma comment(lib,"Ws2_32.lib")

BOOL  GetRealIpByDomainName(char *szHost, char szIp[50][100], int *nCount)
{
    WSADATA wsaData;
    HOSTENT *pHostEnt;
    int nAdapter = 0;
    struct sockaddr_in   sAddr;
    if (WSAStartup(0x0101, &wsaData))
    {
        printf(" gethostbyname error for host:\n");
        return FALSE;
    }
    pHostEnt = gethostbyname(szHost);
    if (pHostEnt)
    {
        while (pHostEnt->h_addr_list[nAdapter])
        {
            memcpy(&sAddr.sin_addr.s_addr, pHostEnt->h_addr_list[nAdapter], pHostEnt->h_length);

            sprintf_s(szIp[nAdapter], "%s", inet_ntoa(sAddr.sin_addr));

            nAdapter++;
        }

        *nCount = nAdapter;
    }
    else
    {
        DWORD  dwError = GetLastError();
        *nCount = 0;
    }
    WSACleanup();
    return TRUE;
}

int _tmain(int argc, _TCHAR* argv[])
{
    int nIpCount = 0;
    char szIpList[50][100];
    char szDomain[256] = { 0 };
    char szIp[1024] = { 0 };
    strcpy_s(szDomain, "www.baidu.com");
    GetRealIpByDomainName(szDomain, szIpList, &nIpCount);

    for (int i = 0; i < nIpCount; i++)
    {
        strcat_s(szIp, szIpList[i]);
        strcat_s(szIp, "\t");
    }
    printf("DomainName : %s \n", szDomain);
    printf("Real IPList : %s", szIp);
    return 0;
}