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Why do I get a linker error (LNK 2019) when using NI-488.2 driver in Microsoft Visual C\C++?

Primary Software: Driver Software>>NI-488.2
Primary Software Version: 1.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: GPIB

Problem:

I am using the NI-488.2 Driver in Microsoft Visual C\C++ and have included ni4882.h as instructed in the help file. However when I attempt to compile this I get link error LNK 2019: unresolved external symbol. How can I compile my project?

Solution:

As well as including the header file found at C:\Program Files\National Instruments\Shared\ExternalCompilerSupport\C\Headers\ni4882.h you need to include the object file as well. This is ni4882.obj and is located in C:\Program Files\National Instruments\Shared\ExternalCompilerSupport\C\Lib32\ni4882.obj. There are three methods of including this.

Create the project as a Measurement Studio project.
When you create a Measurement Studio project it will set up the include files for you and this will not be a problem.
Include the file in your project.
In your project add the object file (C:\Program Files\National Instruments\Shared\ExternalCompilerSupport\C\Lib32\ni4882.obj)
Include the file in the linker options.
1. In Visual Studio open Project»Properties.
2. Select linker in the tree diagram.
3. In command line enter %NIEXTCCOMPILERSUPP%\lib32\msvc\ni4882.obj
  
  This environmental variable points at the external compiler support folder as used in option two as well.
The project should now compile and link successfully.

KnowledgeBase 488DF36S: NI-DAQmx, NI-VISA, and NI-488.2 Visual C++ Example Locations
KnowledgeBase 3CHC5G5B: VISA and GPIB Application Development Using C# or VB.NET

Attachments:

Report Date: 05/12/2009
Last Updated: 05/29/2009
Document ID: 4XB9OVBN

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