public extern static Byte osvrRegisterImagingCallback(SafeClientInterfaceHandle iface, [MarshalAs(UnmanagedType.FunctionPtr)] ImagingCallback cb, IntPtr /*void**/ userdata);
protected override void Start() { cb = new ImagingCallback(this.InterfaceCallback); Interface.osvrRegisterImagingCallback(iface.Handle, cb, IntPtr.Zero); }