NI-VISA提供了多种通用接口驱动API，采用自底向上的设计结构，本文主要讲解的是PCI接口驱动的NI-VISA实现。-NI-VISA provides a variety of general-purpose interface driver API, using the bottom-up design of the structure, this paper is to explain PCI interface driver NI-VISA implementation.