WinUSB: How to tell if the device has gone

At present, I send a control port message and do not get a reply and the
error code is something about a device is not functoning. Is there anyway
to find out that this has happened without doing the control transfer? I'd
like to know so that (a) I can tell the user that the device has gone away,
and (b) perhaps relate its going away to something else happening in the
system at the same time.

From USBTrace I know that nothing goes down the stack to the USB bus.

TIA,
Bill

register for pnp handle notifications on the HANDLE that you opened with
RegisterDeviceNotification. you will be told when the usb device has been
unplugged

d

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"Bill Davy" <Bill.DeleteThis@SynectixLtd.com> wrote in message
news:u0LAM7FBJHA.2476@TK2MSFTNGP06.phx.gbl...
> At present, I send a control port message and do not get a reply and the
> error code is something about a device is not functoning. Is there anyway
> to find out that this has happened without doing the control transfer?
> I'd like to know so that (a) I can tell the user that the device has gone
> away, and (b) perhaps relate its going away to something else happening in
> the system at the same time.
>
> From USBTrace I know that nothing goes down the stack to the USB bus.
>
> TIA,
> Bill
>