Capture Control - be notified if USB camera is disconnected during recording

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Monday, August 13, 2012 12:27:11 AM(UTC)

CUrquhart

Groups: Registered
Posts: 4

We're using the capture control (v 17.5) to record from USB camera devices, sometimes we record from 2 cameras simultaneously. We have a requirement that if during recording a camera is disconnected we can inform the user, but I cannot find how to do this. The CaptureCtrl has events ErrorAbort, RestartApplication and MediaEvent but MediaEvent is only for DVD events and the other two events don't fire when I unplugged the camera.

Is there an event (or something else) in CaptureCtrl that can do this? If not I can only assume I'll need to have another thread which periodically checks that the video device is still in the CaptureCtrl.VideoDevices list?


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#2 Posted : Monday, August 13, 2012 3:04:04 AM(UTC)

Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)

You can use the ltmmCapture.VideoDevices.Refresh Method to rebuild the collection of system-registered devices. And then you can check the ltmmCapture.VideoDevices[Camera Index] to see if it is still valid.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

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