* ENC: How to detect USB camera disconnection?
@ 2009-08-20 16:54 Nilo Roberto C Paim
2009-08-21 8:39 ` Jean-Francois Moine
0 siblings, 1 reply; 2+ messages in thread
From: Nilo Roberto C Paim @ 2009-08-20 16:54 UTC (permalink / raw)
To: video4linux-list
Hi, all.
I've a Vimicro USB cam that I'm constantly pooling for taking snapshots
using an application made by me. How can I programmatically detect when the
cam is disconnected?
It seems to me that V4L "thinks" that the cam is still there, even with the
cable disconnected.
Any hints?
--- > I'd forgot to say: the driver I'm using is gspca, last version. Works
like a charm. My problem is related to cable's cam disconnected.
Nilo Roberto C Paim
nilopaim@gmail.com
TinyCOBOL - Equipe de Desenvolvimento
Porto Alegre - RS - Brasil
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* Re: How to detect USB camera disconnection?
2009-08-20 16:54 ENC: How to detect USB camera disconnection? Nilo Roberto C Paim
@ 2009-08-21 8:39 ` Jean-Francois Moine
0 siblings, 0 replies; 2+ messages in thread
From: Jean-Francois Moine @ 2009-08-21 8:39 UTC (permalink / raw)
To: Nilo Roberto C Paim; +Cc: video4linux-list
On Thu, 20 Aug 2009 13:54:26 -0300
"Nilo Roberto C Paim" <nilopaim@gmail.com> wrote:
> I've a Vimicro USB cam that I'm constantly pooling for taking
> snapshots using an application made by me. How can I programmatically
> detect when the cam is disconnected?
>
> It seems to me that V4L "thinks" that the cam is still there, even
> with the cable disconnected.
>
> --- > I'd forgot to say: the driver I'm using is gspca, last
> version. Works like a charm. My problem is related to cable's cam
> disconnected.
Hi Nilo,
I don't know how you poll. Normally, when the webcam is disconnected,
the I/O calls should fail with errno = NODEV.
Cheers.
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Jef | http://moinejf.free.fr/
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2009-08-20 16:54 ENC: How to detect USB camera disconnection? Nilo Roberto C Paim
2009-08-21 8:39 ` Jean-Francois Moine
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