虚拟视频适配器，它的过滤器的真正视频适配器拦截帧一帧，从而使帧的修改，这是特别有用的建立，如屏幕显示功能。-Virtual Video Adapter which filters the real Video Adapter to intercept fr a me by fr a me and hence enables the modification of fr a mes, it is particularly useful t