流设备驱动实际上就是导出标准的流接口函数的驱动，这是文档上面的定义。在WinCE中，所有的流设备都导出流设备接口，这样WinCE中的Device Manager可以加载和管理这些流设备驱动。-Stream device driver is actually the standard stream interface functions to export driven, which is the definition of the above documents. In WinCE, all s