File System Filter driver

See more:

driver

Hi all,
i used File System Filter driver example which belong's to "Sergey Podobry"
and i want to send some data from driver to my application using "DeviceIoControl".
Actually i got handle to the device object in right way ,but when i call "DeviceIoControl" i got blue screen .
Here what i have done.

//g_PDeviceObject  global pointer to Device object
NTSTATUS FsFilterDispatchControl(
    __in PDEVICE_OBJECT DeviceObject,
    __in PIRP           Irp
    )
{
    PIO_STACK_LOCATION ioStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG			   operation;
    NTSTATUS status=STATUS_SUCCESS;
    if(DeviceObject==g_PDeviceObject)
    {
        operation = ioStack->Parameters.DeviceIoControl.IoControlCode;
        switch (operation)
             {
                 case IOCTL_OPEN_EVENT:
                    DbgPrint("IOCTL_OPEN_EVENT \n");
                    break;
                 default:
                    status=STATUS_INVALID_DEVICE_REQUEST;
                    break;
            }
        Irp->IoStatus.Status = status;
        Irp->IoStatus.Information = 0;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return status;
    }
    else
    {
         return FsFilterDispatchPassThrough(DeviceObject, Irp);
    }
}

In user mode Application :

DeviceDriver = CreateFile(
                   \\\\.\\example,                  // lpFileName
                   GENERIC_READ | GENERIC_WRITE,       // dwDesiredAccess
                   FILE_SHARE_READ | FILE_SHARE_WRITE, // dwShareMode
                   NULL,                               // lpSecurityAttributes
                   OPEN_EXISTING,                      // dwCreationDistribution
                   0,                                  // dwFlagsAndAttributes
                   NULL                                // hTemplateFile
                   );



   if (DeviceDriver == INVALID_HANDLE_VALUE) {

       printf("Unable to open handle to the device driver\n");
       return 1;
   }

   //
   // Send an IOCTL to the driver to signal that the named event
   // has been created and that it can now open a handle to it
   //

   if (!DeviceIoControl(DeviceDriver,
                        IOCTL_OPEN_EVENT,
                        NULL,0,
                        NULL,0 ,
                        &bytesReturned,
                        NULL)) {

       printf("The driver failed to open the named event!\n");
       return 1;

   }

   printf("you have successfully called the device !\n");

   CloseHandle(DeviceDriver);

In Driver Entry :

RtlInitUnicodeString(&usDriverName, L"\\Device\\example");
RtlInitUnicodeString(&usDosDeviceName, L"\\DosDevices\\example");


//Create device object
NtStatus = IoCreateDevice (
                  DriverObject,
                  0,
                  &usDriverName,
                  FILE_DEVICE_UNKNOWN,
                  FILE_DEVICE_SECURE_OPEN,
                  FALSE,
                  &g_PDeviceObject
                  );

//create symbolic link 

NtStatus=IoCreateSymbolicLink(&usDosDeviceName, &usDriverName);
   if(!NT_SUCCESS(NtStatus))
   {
       return NtStatus;
   }


DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = FsFilterDispatchControl;



VOID FsFilterUnload(
    __in PDRIVER_OBJECT DriverObject
    )

{
UNICODE_STRING usDosDeviceName;
RtlInitUnicodeString(&usDosDeviceName, L"\\DosDevices\\example");
IoDeleteSymbolicLink(&usDosDeviceName);
IoDeleteDevice(g_PDeviceObject);
}

finally,what i posted is only the changes i have made on the file system filter driver .
please , help me i don't know why i got blue screen during calling "DeviceIoControl".