说明：  对于小摄像头的驱动有几种方法，通过使用DirectShow来驱动摄像头灵活性比较好，有简单的方法也有比较复杂但更有效的方法，本文只介绍简单方法，希望与大家交流！
(small camera is driven by several methods, using DirectShow to drive the camera better flexibility, a simple way to a more complex but more effective method, only introduced simple, in the hope of sharing with you!)