枚举Windows系统音视频设备，VC++程序枚举出系统的音频视频设备。利用COM组件，ICreateDevEnum CLSID_SystemDeviceEnum可以枚举出设备名称，GUID等-Enumerate Windows system audio and video equipment, VC++ program cited system audio and video equipment. Using COM components, ICreateDevEnum CLSID_Syste