USB I/O Targets
A primary design goal for WDF was to make the driver models easy to extend to support new types of hardware. The first hardware-specific specialized I/O targets in both UMDF and KMDF support USB devices. You can use the USB I/O targets to write a fully functional Windows driver for a USB device that uses the Windows USB device stack.
Although using USB devices is generally easy, programming them can be difficult. Drivers must deal with surprise removal, state management, and cleanup because a user can remove a device at any time. Although the USB driver interface is relatively complex, the UMDF and KMDF implementations present the abstraction in an organized way and simplify many of the routine tasks that USB client drivers must ...
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