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 consumption CPU, should be collected for each need to empty the Buffer. There is a need to look at it and improve what should be relatively easy to use.