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 INITCODEextern "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;    }