Question

I’ve got a program where I’m forced to meld together some C and C++ code. I’ve got some global variables defined in C and I need to access them in both C and C++ files but can’t figure it out. Here’s what I have, which works in C files, but not in CPPs:

C.h

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _COMMON_H_
#define _COMMON_H_

extern char test[100];

#ifdef __cplusplus
}
#endif

C.c

#include <windows.h>
#include <stdio.h>
#include "C.h"

char test[100] = "value";

CPlusPlus.cpp

#include "C.h"

int TestFunction() {
    // I need to access variable test here
}

Thanks,
Ben

Answer 1

Assuming the question is ‟how do I access the variable test here?”

Like this:

#include "C.h"
#include <cstring>
int TestFunction() {
  return strcmp(test, "volvo");
}