WinUSB: How to tell if the device has gone

Posted: 08-22-2008, 02:55 PM

Bill Davy

Guest
Posts: n/a

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

Responses to "WinUSB: How to tell if the device has gone"

Doron Holan [MSFT]

Guest
Posts: n/a

Re: WinUSB: How to tell if the device has gone

Posted: 08-22-2008, 05:43 PM

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@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
>

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