title: Capture an image from a webcam “still pin”?
body: <p>I'm looking for a way to capture a still image<br>
  from a webcam <strong>without</strong> streaming video from it.<br>
  (I have a USB bandwidth limitation and starting video will fail)  </p>
  
  <p>I could not find any examples how to read from a webcam's “still pin”.<br>
  C++ or C# code for Windows would be very helpful.<br>
  Thanks.</p>