private void Run(Emgu.Util.ExceptionHandler eh = null)
{
try
{
while (_grabState == GrabState.Running || _grabState == GrabState.Pause)
{
if (_grabState == GrabState.Pause)
{
_pauseEvent.WaitOne();
}
else if (IntPtr.Zero.Equals(_ptr) || !Grab())
{
//capture has been released, or
//no more frames to grab, this is the end of the stream.
//We should stop.
_grabState = GrabState.Stopping;
}
}
}
catch (Exception e)
{
if (eh != null && eh.HandleException(e))
{
return;
}
throw new Exception("Capture error", e);
}
finally
{
_grabState = GrabState.Stopped;
}
}
/// <summary>
/// Start the grab process in a separate thread. Once started, use the ImageGrabbed event handler and RetrieveGrayFrame/RetrieveBgrFrame to obtain the images.
/// </summary>
/// <param name="eh">An exception handler. If provided, it will be used to handle exception in the capture thread.</param>
public void Start(Emgu.Util.ExceptionHandler eh = null)
{
if (_grabState == GrabState.Pause)
{
_grabState = GrabState.Running;
_pauseEvent.Set();
}
else if (_grabState == GrabState.Stopped || _grabState == GrabState.Stopping)
{
_grabState = GrabState.Running;
_captureTask = new Task(delegate { Run(eh); });
_captureTask.Start();
}
}