Chapter 11

Advanced Topics

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Now that you’ve seen how to create a short program to perform a measurement in popular programming environments, we want to introduce a few advanced IVI topics: architecture, requirements for interchangeability, Configuration Store, and future developments. These should broaden your view of the capabilities of IVI drivers.

IVI Architecture

Up to this point, we’ve focused on using either an IVI-COM or IVI-C driver from a specific ADE. The schematic below illustrates the use model for IVI drivers that was deployed in the previous chapters. This use model is the simplest method of using an IVI driver but does not enable interchangeability. This section explains the architecture, including the capabilities of the various driver types and their contribution to interchangeability.

Driver API

To support popular programming languages and development environments, IVI drivers provide either an IVI-COM or an IVI-C API. Driver developers may provide both interfaces, as well as wrapper interfaces that improve usability in specific development environments.

The IVI-COM driver uses a standard Component Object Model (COM) interface that provides access to the functions defined in the class through a hierarchy of methods and properties.

The IVI-C driver appears as a dynamic link library (DLL), such as Windows DLL, composed of standard C functions. The C specifications also define components such as error handling and driver session creation and management, which ensure robustness and interoperability.

The easiest interface to use in a given Application Development Environment is one that is native to the environment. So a C interface works best in C and a COM interface in Visual Basic. Some ADEs support only one type of interface, however, which makes the choice simple.

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HP manual Chapter Advanced Topics, IVI Architecture, Driver API

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