网络编程 拒绝访问。。。

 int main()
{
    // 首先调用GetIpAddrTable函数获取一个适配器
    PMIB_IPADDRTABLE pIPAddrTable;
    DWORD dwSize = 0;

    pIPAddrTable = (PMIB_IPADDRTABLE)::GlobalAlloc(GPTR, sizeof(MIB_IPADDRTABLE));

    // 获取所需的内存
    if (::GetIpAddrTable(pIPAddrTable, &dwSize, FALSE) == ERROR_INSUFFICIENT_BUFFER)
    {
        ::GlobalFree(pIPAddrTable);
        pIPAddrTable = (PMIB_IPADDRTABLE)::GlobalAlloc(GPTR, dwSize);
    }

    // 再次调用GetIpAddrTable获取实际我们想要的数据
    if (::GetIpAddrTable(pIPAddrTable, &dwSize, FALSE) == NO_ERROR)
    {
        // 打印出适配器信息
        printf(" Address: %ld\n", pIPAddrTable->table[0].dwAddr);
        printf(" Mask:    %ld\n", pIPAddrTable->table[0].dwMask);
        printf(" Index:   %ld\n", pIPAddrTable->table[0].dwIndex);
        printf(" BCast:   %ld\n", pIPAddrTable->table[0].dwBCastAddr);
        printf(" Reasm:   %ld\n", pIPAddrTable->table[0].dwReasmSize);
    }
    else
    {
        printf(" GetIpAddrTable() failed \n");
    }

    ::GlobalFree(pIPAddrTable);

    // 我们将要添加的IP和mast
    UINT iaIPAddress;
    UINT imIPMask;

    iaIPAddress = inet_addr("192.168.0.27");
    imIPMask = inet_addr("255.255.255.0");

    // 返回的句柄
    ULONG NTEContext = 0;
    ULONG NTEInstance = 0;

    // 向第一个适配器添加IP地址
    DWORD dwRet;
    dwRet = ::AddIPAddress(iaIPAddress, imIPMask,
        pIPAddrTable->table[0].dwIndex, &NTEContext, &NTEInstance);
    if (dwRet == NO_ERROR)
    {
        printf(" IP address added.\n");
    }
    else
    {
        printf(" AddIPAddress failed. \n");
        LPVOID lpMsgBuf;
        // 调用失败，打印出为什么失败
        if (::FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER |
            FORMAT_MESSAGE_FROM_SYSTEM |
            FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL,
            dwRet,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
            (LPTSTR)&lpMsgBuf,
            0,
            NULL))
        {
            printf(" Error: %s ", lpMsgBuf);
        }
        ::LocalFree(lpMsgBuf);
    }

    system("pause");
    return 0;
}

拒绝访问，怎么办呢？

    printf(" Error: %s\n ", lpMsgBuf);    

用管理器权限运行程序试试。