Error -2147221480 Illegal Parameter Name When Compiling DLL in LabVIEW

Updated Nov 20, 2023

Reported In

Software

  • LabVIEW

Operating System

  • Windows

Programming Language

  • C

Issue Details

My VI runs as expected, but when I try to build to a DLL, I am getting multiple C syntax error messages like the following:

Error-2147221480:
An error occurred compiling the DLL because a function or parameter name is illegal. Please verify that the function and/or parameter names are legal C identifiers and do not conflict with LabVIEW headers.
Additional Information: SharedLib.c - 9 errors


 

Solution

In most of the cases, this error is related to a conflict with the name of the variables or the components inside the VI with the 'C' programming language.
In order to solve this issue:
  • Please verify that you are not passing string data with the incorrect method. (See Create LabVIEW DLL to Pass Strings )
  • Review the syntax error that the error message is stating and verify if in some of your VIs there is a component called that way, if so, please re-name all the components and try building your DLL again.
  • Go to DLL >> Properties >> Advanced and deselect the "Include a type library for TestStand or Call Library Nodes" checkbox.
DLL properties.png
 

Related Links

Other Support Options

Ask the NI Community

Collaborate with other users in our discussion forums



Request Support from an Engineer

A valid service agreement may be required, and support options vary by country.