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Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports.
传值是符合数据流驱动程序的传参方式，LabVIEW 中应该尽量使用这种方式。但是传引用在某些情况下是不可避免的，比如程序要在不同的线程中对同一数据进行操作。
引用在 C++ 中是一个4或8字节的数据用来表示一块数据的地址，而不是数据本身。数据本身保存在某处可以被动个资源同时访问到的地方。
详细资料参考：
http://ruanqizhen.spaces.live.com/blog/cns!5852D4F797C53FB6!3193.entry
NI社区“代码范例交流区”(Example Code Exchange)中的代码范例已获得MIT许可。
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