Error Undefined Symbol in Winhost.obj in LabWindows™/CVI™ Real-Time

Updated May 15, 2023

Reported In


  • LabWindows/CVI
  • LabWindows/CVI Real-Time Module

Programming Language

  • C
  • C++

Issue Details

When compiling my LabWindows™/CVI™ Real-Time application DLL I get linker errors on undefined symbols in winhost.obj. There are different functions that are referenced. How do I build my application? 


error: Undefined symbol '_PlotStripChart@28'  in winhost,obj 
error: Undefined symbol '_SetCtrlVal' in winhost,obj 



The undefined symbol error can occur for several reasons, check the following: 

  • Ensure that you are not including libraries that are not supported in LabWindows/CVI Real-Time in your code or within the project.
  • Check to ensure that your build settings are correct to build an RT application.