在VC++开发平台下，以USB摄像头为实验对象，根据USB系统规范，采用Windows操作系统I/O设备驱动原理与动态链接库技术相结合的方法，调用Win32API函数，开发具有USB通用通信程序模块接口的DLL。然后在LabVIEW或Labwindows下采用其外部代码接口机制调用该DLL，开发通用的USB摄像头通信程序模块组，实现对USB摄像头的查询、打开、关闭、图像显示、视频帧和图像参数显示及设置等操作功能。-As experimental subjects VC++ development platform, USB camera, using the Windows operating system I/O device driver principle and dynamic link library technology phase combined with the specification of the USB system, call the Win32API function development the USB Universal communications program module interface DLL. Then using the external code interface mechanism to call the DLL, the development of generic USB camera communication program module group, query on the USB camera, Open, Close, image display, display and set the video frame and image parameters such as operating under LabVIEW or LabWindows functions.