#pragma PAGEDCODE

NTSTATUS HelloWDMAddDevice(IN PDRIVER_OBJECT DriverObject,

                           IN PDEVICE_OBJECT PhysicalDeviceObject)

{

    PAGED_CODE();

    KdPrint(("Enter HelloWDMAddDevice\n"));

    NTSTATUS status;

    PDEVICE_OBJECT fdo;

    UNICODE_STRING devName;

    RtlInitUnicodeString(&devName,L"\\Device\\MyWDMDevice");

    status = IoCreateDevice(

        DriverObject,

        sizeof(DEVICE_EXTENSION),

        &(UNICODE_STRING)devName,

        FILE_DEVICE_UNKNOWN,

        ,

        FALSE,

        &fdo);

    if( !NT_SUCCESS(status))

        return status;

    PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION)fdo->DeviceExtension;

    pdx->fdo = fdo;

    pdx->NextStackDevice = IoAttachDeviceToDeviceStack(fdo, PhysicalDeviceObject);

    UNICODE_STRING symLinkName;

    RtlInitUnicodeString(&symLinkName,L"\\DosDevices\\HelloWDM");

    pdx->ustrDeviceName = devName;

    pdx->ustrSymLinkName = symLinkName;

    status = IoCreateSymbolicLink(&(UNICODE_STRING)symLinkName,&(UNICODE_STRING)devName);

    if( !NT_SUCCESS(status))

    {

        IoDeleteSymbolicLink(&pdx->ustrSymLinkName);

        status = IoCreateSymbolicLink(&symLinkName,&devName);

        if( !NT_SUCCESS(status))

        {

            return status;

        }

    }

    fdo->Flags |= DO_BUFFERED_IO | DO_POWER_PAGABLE;

    fdo->Flags &= ~DO_DEVICE_INITIALIZING;

    KdPrint(("Leave HelloWDMAddDevice\n"));

    return STATUS_SUCCESS;

}