有关拔出USB设备时产生的“不安全的设备删除“对话框的问题？

我看了站长的这个帖子http://www.driverdevelop.com/forum/viewthread.php?tid=301，按照这样做了，可还是不行，哪位大侠能给我看看除了什么毛病。
NTSTATUS
BulkUsb_QueryCapabilities(
    IN PDEVICE_OBJECT       LowerDeviceObject,
    IN PDEVICE_CAPABILITIES DeviceCapabilities
    )
{
    PIO_STACK_LOCATION nextStack;
    PIRP irp;
    NTSTATUS ntStatus;
    KEVENT event;


    // This is a DDK-defined DBG-only macro that ASSERTS we are not running pageable code
    // at higher than APC_LEVEL.
    PAGED_CODE();


    // Build an IRP for us to generate an internal query request to the PDO
    irp = IoAllocateIrp(LowerDeviceObject->StackSize, FALSE);

    if (!irp) {
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    //
    // Preinit the device capability structures appropriately.
    //
    RtlZeroMemory( DeviceCapabilities, sizeof(DEVICE_CAPABILITIES) );
    DeviceCapabilities->Size = sizeof(DEVICE_CAPABILITIES);
    DeviceCapabilities->Version = 1;
    DeviceCapabilities->Address = -1;
    DeviceCapabilities->UINumber = -1;


DeviceCapabilities->SurpriseRemovalOK=TRUE;
DeviceCapabilities->Removable=TRUE;
DeviceCapabilities->EjectSupported=TRUE;
DeviceCapabilities->WarmEjectSupported=TRUE;

    // IoGetNextIrpStackLocation gives a higher level driver access to the next-lower
    // driver\'s I/O stack location in an IRP so the caller can set it up for the lower driver.
    nextStack = IoGetNextIrpStackLocation(irp);
    nextStack->MajorFunction= IRP_MJ_PNP;
    nextStack->MinorFunction= IRP_MN_QUERY_CAPABILITIES;



    // init an event to tell us when the completion routine\'s been called
    KeInitializeEvent(&event, NotificationEvent, FALSE);

    // Set a completion routine so it can signal our event when
    //  the next lower driver is done with the Irp
    IoSetCompletionRoutine(irp,
                           BulkUsb_IrpCompletionRoutine,
                           &event,  // pass the event as Context to completion routine
                           TRUE,    // invoke on success
                           TRUE,    // invoke on error
                           TRUE);   // invoke on cancellation of the Irp


    // set our pointer to the DEVICE_CAPABILITIES struct
    nextStack->Parameters.DeviceCapabilities.Capabilities = DeviceCapabilities;

    // preset the irp to report not supported
    irp->IoStatus.Status = STATUS_NOT_SUPPORTED;

    ntStatus = IoCallDriver(LowerDeviceObject,
                            irp);

    //BULKUSB_KdPrint( DBGLVL_MEDIUM,(\" BulkUsb_QueryCapabilities() ntStatus from IoCallDriver to PCI = 0x%x\\n\", ntStatus));

    if (ntStatus == STATUS_PENDING) {
       // wait for irp to complete

       KeWaitForSingleObject(
            &event,
            Suspended,
            KernelMode,
            FALSE,
            NULL);

       ntStatus = irp->IoStatus.Status;
    }

    // failed? this is probably a bug
    //BULKUSB_KdPrintCond( DBGLVL_DEFAULT,(!NT_SUCCESS(ntStatus)), (\"BulkUsb_QueryCapabilities() failed\\n\"));

    IoFreeIrp(irp);

    return ntStatus;
}

你把顺序搞反了。先传下去，再修改。

标记一下，备用