通过USB控制外部的端口，如程序里演示的遥控小车控制，对摄像头进行控制，是使用了VFW.lib的BCB源代码，希望有心人能有所收获。-USB external control ports, such as procedures to demonstrate remote control car, right camera control is the use of VFW.lib the BCB source code, Kind can hope to gain something.