摘要： USB Composite Class DevicesA USB Composite Device is any device which does more than one jobfor example a combined keyboard and mouse.A USB Composite device is the one with multiple interfaces controlled independently of each other. When using such device multiple functions are combined into a singl 阅读全文

摘要： http://www.cppblog.com/Lee7/archive/2008/01/07/40650.htmlOverlapped I/O简述：Overlapped I/O也称Asynchronous I/O，异步I/O模型。异步I/O和同步I/O不同，同步I/O时，程序被挂起，一直到I/O处理完，程序才能获得控制。异步I/O，调用一个函数告诉 OS，进行I/O操作，不等I/O结束就立即返回，继续程序执行，操作系统完成I/O之后，通知消息给你。Overlapped I/O只是一种模型，它可以由内核对象(hand)，事件内核对象(hEvent), 异步过程调用(apcs) 和完成端口(I/O 阅读全文

摘要： 应用程序和驱动程序的通信过程是：应用程序使用CreateFile函数打开设备，然后用DeviceIoControl与驱动程序进行通信，包括读和写两种操作。还可以用ReadFile读数据用WriteFile写数据。操作完毕时用CloseHandle关闭设备。我们比较常用的就是用DeviceIoControl对设备进行读写操作。CreateFile这是一个多功能的函数，可打开或创建以下对象，并返回可访问的句柄：控制台，通信资源，目录(只读打开)，磁盘驱动器，文件，邮槽，管道。HANDLE WINAPI CreateFile( _In_ LPCTSTR lpFileName, _In_ ... 阅读全文

摘要： Standard DescriptorsADevice Descriptordescribes general information about a USB device. It includes information that applies globally to the device and all of the device's configurations. A USB device has only one device descriptor.TheConfiguration Descriptorgives information about a specific de 阅读全文