使用M F C的C F i l e类通过指定COM1: 或者L P T 2 :来实现与这些设备的通信，将读写操作转换为与串行或者将并行设备的实际转换过程由硬件驱动程序完成-CF ile of the use of MFC category by specifying COM1: or LPT 2: to achieve the communication with these devices will be converted to read and write operations with

Two categories of devices don’t fit neatly into the PnP framework I described in Chapter 6. These categories are controller devices, which manage a collection of child devices, and multifunction devices, which have several functions on one card. Thes