What is a Wrapper DLL and When Do I Need One?

Updated Dec 13, 2017

Reported In

Software

  • LabVIEW Base
  • LabVIEW Full

Issue Details

What is a wrapper DLL, and when do I need one?

Solution

A wrapper is a piece of software that provides a compatibility layer to another piece of software. One is often necessary when developing LabVIEW applications because third-party DLLs are typically designed to be accessed from C (or similar low-level languages) and not LabVIEW. Such a DLL may, for example, return pointers or complex data structures which LabVIEW cannot easily handle.

Writing a wrapper DLL can be compared to writing a completely separate program in C that accesses the original DLL in the way the original author intended. In turn, this wrapper program has been specifically designed to be accessed from LabVIEW. In this sense, the new C program "wraps" around the original C program (DLL) and provides a layer of compatibility. The benefit of a wrapper is that the source code for the original DLL is not necessary, as it does not need to be modified in any way.

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