Capture image on webcam physical button press event using directshow

[rahul]

i am developing application to capture image from webcam using .net
and directshow.

i want to capture image when the hardware button available on webcam
is pressed.i cant be able to do it using directshow.net library.Is
there any way in directshow to detect webcam hardware button press
event so that i can capture image on that event and save it?

i have already posted this question on DirectShow.NET forum on
SourceForge.but did not get any solution.

i hope that i will get solution from this forum.please provide me the
source code for my problem.

any help regarding this is appreciatable.

thanks & regards,

rahul

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