void Release()
{
if (iGrabber != null)
{
iGrabber.ReleaseFrame(iFrame);
iGrabber = null;
iFrame = null;
iBitmap = null;
}
}
/// <summary>
/// Grabs one frame. The caller doesn't have to call Start first,
/// but it's recommended in order to get maximum frame rate.
///
/// The second parameter is the capture format, i.e. one of
/// V2U_GRABFRAME_FORMAT_* optionally combined with flags
///
/// The last parameter is a pointer to the requested crop rectangle.
/// Pass null if you need the whole frame.
/// </summary>
public unsafe Frame GrabFrame(uint format, V2URect *crop)
{
V2U_GrabFrame2 *frame = FrmGrab_Frame(iGrabber, format, crop);
if (frame != null)
{
try {
return(new Frame(this, frame));
} catch {
FrmGrab_Release(iGrabber, frame);
}
}
return(null);
}
internal Frame(FrameGrabber aGrabber, V2U_GrabFrame2 *aFrame)
{
iGrabber = aGrabber;
iFrame = aFrame;
iBitmap = null;
}
/// <summary>
/// Releases the frame previously returned by FrmGrab_Frame
/// </summary>
internal unsafe void ReleaseFrame(V2U_GrabFrame2 *aFrame)
{
FrmGrab_Release(iGrabber, aFrame);
}
static extern unsafe void FrmGrab_Release(IntPtr fg, V2U_GrabFrame2 *frame);
