NITestStand高级架构系列：代码模块开发与调用指南
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"《测试台专长手册》是National Instruments Corporation编写的文档，主要关注于测试台（TestStand）的高级架构系列，特别是代码模块开发部分。代码模块是一种在TestStand中执行特定测试或操作的软件组件。它支持多种编程环境和语言，包括NI LabVIEW、NI LabWindows™/CVI™、C#、VB.NET、C/C++、HTBasic和ActiveX等。
本章详述了开发代码模块时需要考虑的关键要素，着重于确保模块与TestStand 3.5及后续版本的兼容性和高效交互。TestStand引擎利用适配器作为桥梁，为代码模块提供接口，使其能在执行测试序列时被加载、调用，并在引擎与模块之间传递数据。
图1-1展示了五种内置的TestStand步骤类型，这些类型创建的步骤实例可以调用代码模块。新创建的步骤会使用由步骤类型定义的默认属性，如运行选项和状态表达式，但不会指定具体的代码模块。对于代码模块的适配器，第4章“内置步骤类型”和第5章“调用代码模块”提供了更深入的介绍。
这本手册对于理解如何在TestStand环境中设计、集成和优化代码模块，以实现高效的自动化测试流程至关重要。开发者需要熟悉不同编程语言接口的使用，以及如何利用适配器确保模块与TestStand的无缝协作。阅读本章将有助于提升测试效率并避免潜在的兼容性问题。"
Chapter 1 Code Module Development
NI TestStand Advanced Architecture Series 1-4 ni.com
Passing the SequenceContext Object Reference to Code Modules
Using the TestStand API in code modules requires passing in references to
the relevant TestStand objects. Typically, steps pass a reference to the
SequenceContext object to code modules because the SequenceContext
object provides access to all other TestStand objects. If you pass a reference
to the SequenceContext object to all code modules, you can use the
TestStand API within the modules in the future without updating existing
calls to a particular module. You can use the SequenceContext object to
access any variable or property, and you can use the PropertyObject
interface to store or retrieve values. The drawbacks of using this approach
instead of using explicit additional parameters are that it requires TestStand
API calls within the module to access data. Therefore, the parameter list of
the code module is no longer a fully accurate representation of the data the
module requires or returns. By not explicitly passing data through
parameters, you can make sequence file debugging and validation more
difficult.
If the code module does not allow a null SequenceContext value, you
cannot call the module outside of TestStand. Therefore, you should test the
validity of the SequenceContext reference. In LabVIEW, you can use the
Not A Number/Path/Refnum? function, which returns a Boolean value,
as shown in Figure 1-3.
Figure 1-3. Using Not a Number/Path/Refnum? to Check Validity
of SequenceContext Object
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