DeviceIoControl problem (IncorrectFunction) in IOCTL driver

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C

Windows

Win32

file

Hi there!

I'm trying to make my own IOCTL driver command for calling it from an user-mode application DLL. For now I just wanted to make sure the DLL successfully calls that command on the driver code. So I defined my command (in the DLL and in the driver's code) like this:

define BUSENUM_IOCTL(index) \
CTL_CODE (FILE_DEVICE_BUS_EXTENDER, _index_, METHOD_BUFFERED, FILE_ANY_ACCESS)
...

define IOCTL_DEBUG_LOG_INFO BUSENUM_IOCTL (0x4)

in the driver code, in my corresponding IRP_MJ_DEVICE_CONTROL function, I have something like this:

switch ( command )
    {
  case IOCTL_DEBUG_LOG_INFO:
   KdPrint(("IOCTL_DEBUG_LOG_INFO:\n"));
   if(devExt->Type==0)
   {
    status = STATUS_SUCCESS;
   }
   else
   {
    status=STATUS_INVALID_DEVICE_REQUEST;
    KdPrint(("Wrong device on IOCTL_DEBUG_LOG_INFO command"));
   }
   break;
...
}

and in the dll code I'm calling the driver's command like this:

if (DeviceIoControl(h, IOCTL_DEBUG_LOG_INFO,
      debugLogInfoData, sizeof(DEBUG_LOG_INFO),
      debugLogInfoData, sizeof(DEBUG_LOG_INFO),
      junk, NULL))
 {
  CloseHandle(h);

  ...

  return VDD_NO_ERROR;
 }

 PrintLastError(prefix);

 return VDD_UNKNOWN_ERROR;
}

(where h is the handle initialized when I opened the stub driver (devExt->Type==0) )

but it always goes to the 'VDD_UNKNOWN_ERROR'; with the error code 1: Incorrect function

What am I doing wrong? ...

Help please!