为啥驱动加载了，应用程序ReadFile不进入驱动中指定的IRP_MJ_READ例程

#pragma INITCODE
extern "C" NTSTATUS DriverEntry(IN PDRIVER_OBJECT pDrvObj, IN PUNICODE_STRING RegistryPath)
{
    NTSTATUS status;
    KdPrint(("Enter DriverEntry\n"));

    //注册其它驱动用函数入口
    pDrvObj->DriverUnload = DriverUnlocd;
    pDrvObj->MajorFunction[IRP_MJ_DEVICE_CONTROL] = DDKDeviceIoControl;
    pDrvObj->MajorFunction[IRP_MJ_READ] = DDKReadFile;

    //创建驱动设备对象
    status = CreateDevice(pDrvObj);
    KdPrint(("Leave DriverEntry\n"));
    return status;
}

DWORD dwNum, dwOut = 4, dwOutRet;
    HANDLE hDriver = CreateFile(".//EnumProcess.sys",
        GENERIC_READ | GENERIC_WRITE,
        0, 
        NULL, 
        OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL,
        NULL);
    if(INVALID_HANDLE_VALUE == hDriver)
    {
        MessageBox("CreateFile failed!");
        return FALSE;
    }
    BOOL bOk = ReadFile(hDriver, &dwNum, sizeof(DWORD), &dwOutRet, NULL);
    if(!bOk)
    {
        DWORD dwError = GetLastError();
        CString str;
        str.Format("DeviceIoControl1 failed! code:%d\n", dwError);
        MessageBox(str);
        return FALSE;
    }