此程序利用DirectSound7实现声音采集并显示其波形，优点是代码很简单，缺点是比较耗CPU，应为每次采集都需要清空Buffer。有需要的看看吧，改进一下应该会比较好用。-DirectSound7 use this procedure to achieve the sound collection and display its waveform, the advantages of the code is very simple, the disadvantage of comparing

构建一个空的DirectX3D框架，运行结果为一个只有单一颜色的空窗口程序。-Build an empty DirectX3D framework, the results of a single color of the empty window program.

directshow开发，一个不带pin的空filter.主要是方便初学者了解filter的架构。-the directshow develop, without pin empty the filter is easy for beginners to understand the filter architecture.