使用vfw，控制摄像头。
VFW(Video for Windows)是Microsoft公司为开发Windows平台下的视频应用程序提供的软件工具包，提供了一系列应用程序编程接口（API），用户可以通过它们很方便地实现视频捕获、视频编辑及视频播放等通用功能，还可利用回调函数开发更复杂的视频应用程序。,Use vfw, control camera. VFW (Video for Windows) is the Microsoft Corporation for the development under the Windows platform to provide video applications software toolkit to provide a series of Application Programming Interface (API), users can easily achieve their video capture, video editing and video player, such as common features, can also use a callback function to develop more complex video applications.