CODEWITHSUNDEEP
cdeclspec
Amit Deshpande
Amit Deshpande

Reputation: 1

Using __declspec results in "Error C2370 'In1': redefinition; different storage class"

I have a dll created using MSVC. The header file and a .def file are also present. Here is what is exported from the dll (simple.def):

EXPORTS
simple_initialize
simple_step
simple_terminate

In1
Gain
Increment

I have a simple application that is trying to access the functions and variables inside the dll (have the .lib file as well). The MSVC project files have the necessary files provide and the application builds correctly. Here's the application code:

#include <stddef.h>
#include <stdio.h>              
#include "simple.h"
#include "rtwtypes.h"
void main(void)
{
    int i;      
    simple_initialize();
    for (i = 0; i < 10; i++)
    {       
        simple_step();
    }
    simple_terminate();
}

This code seems to be working fine, however, if I try to write to any of the global variables (In1, Gain or Increment) from the dll it results in a crash.

After researching I realized that the only way I can make it work is by adding

__declspec(dllimport) real_T In1;

AND commenting out this line from the header file:

extern real_T In1;

If I do not comment this line, then I get following error:

Error C2370 'In1': redefinition; different storage class SimpleTest \SimpleTest.c 8

Upvotes: 0

Views: 164

Answers (0)

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