This content is not available in your preferred language.

The content is shown in another available language. Your browser may include features that can help translate the text.

Where is the "visa.h" Header File to Include in a C++ Program?

Updated Apr 21, 2023

Reported In


  • LabVIEW Full



Programming Language

  • C++

Issue Details

I am writing a C++ program that uses VISA to control an instrument, and the NI-VISA documentation indicates that I need to include a visa.h header file in my program. Where can I find this file?


The visa.h header file (and other files that you might need to include) can be found at either of the following two paths for 64-bit Windows:
  • C:\Program Files (x86)\IVI Foundation\VISA\WinNT\include

  • C:\Program Files\IVI Foundation\VISA\Win64\include

For 32-bit Windows, the path will be:

  • C:\Program Files\IVI Foundation\VISA\WinNT\include

Note that the WinNT in the above paths will still be WinNT for all Windows versions.