In programming, a Wrapper is a code block--typically a function, class, or module--that encapsulates another component, such as a library or system API. Its primary purpose is to abstract complex interfaces or adapt code for specific environments to improve usability.
Wrappers are essential for simplifying development. By consolidating multiple detailed operations into a single function call, they reduce code complexity and minimize implementation errors. This abstraction allows developers to focus on higher-level logic rather than low-level implementation details.
They also enhance portability and maintainability. In instrument control systems, engineers often write wrappers around standard VISA library calls. This allows the main application to remain consistent even if underlying hardware drivers or operating systems change, isolating the specific implementation details within the wrapper.
For example, a standard query involves sending a command via viWrite() and retrieving data via viRead(). A wrapper function named Ask(command) can combine these steps and automatically handle error checking in a single operation. This approach results in cleaner, more readable, and easily maintainable test programs.