设计一个keypad UI 然后通过windows API调用一个ＵＳＢ软件，达到控制投影机的功能，UI做的非常的好，如果想做QT界面可以好好看看。-Design a keypad UI and then through a USB software windows API call, to control the projector function, UI do very well, if you want to do QT interface can have a good look.

在WINDOWS下查找到USB设备及其重要信息,不错的源码(Find the USB device in WINDOWS and the important information, good source)

EXAMPLE VISUAL BASIC PROGRAM USING THE EV2300 INTERFACE BOARD INTRODUCTION This procedure defines how to install and run the Visual Basic 6.0 example project developed to enable interaction on the EV2300 SMBus via a USB port. It is recommended t