在MFC下ADO方式访问Oracle数据库时，如何使用ping命令测试网络连接是否正常呢？请写一段MFC代码示例，谢谢，

以下是一个使用ping命令测试网络连接状态的MFC代码示例：

#include <afxsock.h> // 包含Winsock头文件
#include <cstdlib>   // 包含system函数头文件
#include <iostream>

BOOL Ping(const CString& strIP)
{
    SOCKET sockRaw; // 定义原始套接字
    sockRaw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); // 创建ICMP协议的原始套接字
    if (sockRaw == INVALID_SOCKET)
    {
        std::cout << "socket() failed" << std::endl;
        return FALSE; // 创建套接字失败
    }

    sockaddr_in saDest;
    hostent* hpDest = gethostbyname(strIP); // 获取IP地址
    if (hpDest == NULL)
    {
        std::cout << "gethostbyname() failed" << std::endl;
        closesocket(sockRaw);
        return FALSE; // 获取IP地址失败
    }
    memset(&saDest, 0, sizeof(saDest));
    memcpy(&(saDest.sin_addr), hpDest->h_addr, hpDest->h_length);
    saDest.sin_family = AF_INET;

    char icmp_data[32] = "Hello, Oracle!"; // ICMP数据包
    icmp_data[31] = '\0';

    // 构造ICMP报文
    const int ICMP_ECHO = 8; // ICMP回显请求类型
    const int ICMP_ECHOREPLY = 0; // ICMP回显应答类型
    const int ICMP_MIN = 8; // ICMP报文最小长度
    const int DEF_PACKET_SIZE = 32; // ICMP数据包长度
    const int MAX_PACKET = 1024; // ICMP报文最大长度
    int packet_size = sizeof(ICMP_HEADER) + DEF_PACKET_SIZE;
    char* icmp_packet = new char[packet_size];
    memset(icmp_packet, 0, packet_size);
    ICMP_HEADER* icmp_hdr = (ICMP_HEADER*)icmp_packet;
    icmp_hdr->i_type = ICMP_ECHO; // 设置ICMP类型为回显请求
    icmp_hdr->i_code = 0;
    icmp_hdr->i_id = (USHORT)GetCurrentProcessId();
    icmp_hdr->i_cksum = 0;
    icmp_hdr->i_seq = 0;
    char* icmp_data_ptr = icmp_packet + sizeof(ICMP_HEADER);
    memcpy(icmp_data_ptr, icmp_data, strlen(icmp_data));
    icmp_hdr->i_cksum = Checksum((USHORT*)icmp_packet, packet_size); // 计算ICMP校验和

    // 发送ICMP报文
    int ret = sendto(sockRaw, icmp_packet, packet_size, 0, (sockaddr*)&saDest, sizeof(saDest));
    if (ret == SOCKET_ERROR)
    {
        std::cout << "sendto() failed" << std::endl;
        closesocket(sockRaw);
        delete[] icmp_packet;
        return FALSE; // 发送ICMP报文失败
    }

    // 接收ICMP应答报文
    const int MAX_WAIT_TIME = 5000; // 最大等待时间5s
    char recv_buf[MAX_PACKET] = { 0 };
    fd_set readfds;
    timeval timeout;
    timeout.tv_sec = MAX_WAIT_TIME / 1000;
    timeout.tv_usec = (MAX_WAIT_TIME % 1000) * 1000;
    FD_ZERO(&readfds);
    FD_SET(sockRaw, &readfds);
    ret = select(0, &readfds, NULL, NULL, &timeout); // 等待应答报文
    if (ret <= 0)
    {
        std::cout << "select() timeout" << std::endl;
        closesocket(sockRaw);
        delete[] icmp_packet;
        return FALSE; // 等待超时
    }
    sockaddr_in saRecv;
    int nAddrLen = sizeof(saRecv);
    ret = recvfrom(sockRaw, recv_buf, MAX_PACKET, 0, (sockaddr*)&saRecv, &nAddrLen);
    if (ret == SOCKET_ERROR)
    {
        std::cout << "recvfrom() failed" << std::endl;
        closesocket(sockRaw);
        delete[] icmp_packet;
        return FALSE; // 接收应答报文失败
    }

    // 判断ICMP应答报文是否合法
    ICMP_HEADER* pIcmpHeader = (ICMP_HEADER*)recv_buf;
    if ((pIcmpHeader->i_type == ICMP_ECHOREPLY) && (pIcmpHeader->i_id == (USHORT)GetCurrentProcessId()))
    {
        std::cout << "Ping " << strIP.GetString() << " OK" << std::endl;
        closesocket(sockRaw);
        delete[] icmp_packet;
        return TRUE; // 网络连接正常
    }
    else
    {
        std::cout << "Ping " << strIP.GetString() << " failed" << std::endl;
        closesocket(sockRaw);
        delete[] icmp_packet;
        return FALSE; // 网络连接异常
    }
}

void TestPing()
{
    if (Ping("127.0.0.1"))
    {
        std::cout << "localhost is reachable" << std::endl;
    }
    else
    {
        std::cout << "localhost is not reachable" << std::endl;
    }
}

int main()
{
    AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0); // 初始化MFC

    TestPing(); // 测试网络连接状态

    return 0;
}

注意：以上代码中使用了自定义的ICMP_HEADER结构体和Checksum函数，请根据实际情况修改。另外，由于ping命令需要管理员权限才能执行，因此在运行以上代码时需要以管理员身份运行。