DLL and global variables

OK, here's a strange problem.  I am very new to create the dll, so I don't know that I have just an installation problem.

But I'm trying to pass a global variable of a host program to its attached DLL.  I got this job when I was the CVI 2014. I recently upgraded to 2015 and then started getting "undefined symbols" errors.  With some struggle I managed to compile again, but broke the variable connection in the process.

I have compiled my DLL in debug mode so that I walk in from the test project.  Right now, my global variable exists in the test project, as well as in the DLL.

Can I export the variable and the use of DLLIMPORT/DLLEXPORT?  Confused and curiously not to find anyone quite like this on the forums.

EDIT: this post stack overflow described pretty well from my experience.  I am linking statically.

Well, what do you know?  I found my problem.  This draft article and example WERE vital to the solution.  This article called, "using the Export method qualifier"was also useful.  I'll cut to the Chase...

If you use a qualifier of export on the definition and the import on the declaration, LabWindows/CVI identifier export symbol.

This is the right key.

So in my example, it should look like this:

DLL fichier.c

int DLLEXPORT varName = 0;

Header.h DLL

int DLLIMPORT varName;

Project that uses DLL.c

#include "header.h DLL.

varName! = 1 ;  a method to change this variable for local use

Pretty easy, huh?  But wow, it took some time to find.

Tags: NI Software

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