Export and Import Functions (Linking DLL)

//sampleDLL.h

#ifndef sampleDLL_H_
#define sampleDLL_H_
#include <iostream>

#if defined DLL_EXPORT
#define DECLDIR __declspec(dllexport)
#else
#define DECLDIR __declspec(dllimport)
#endif

extern "C"
{
   DECLDIR int Add( int a, int b );
   DECLDIR void Function( void );
}

#endif

//sampleDLL.cpp

#define DLL_EXPORT

#include <iostream>
#include "sampleDLL.h"



extern "C"
{
   DECLDIR int Add( int a, int b ) {
      return( a + b );
   }

   DECLDIR void Function( void ) {
      std::cout << "DLL Called!" << std::endl;
   }
}

//sampleDLL.def

LIBRARY "sampleDLL"

EXPORTS
    Add @1
    Function @2

//sampleAPP.cpp

#pragma comment(lib, "sampleDLL.lib")

#include <iostream>
#include "sampleDLL.h"

int main() {
   Function();
   std::cout << Add(22, 38) << std::endl;
   system("pause");
   return 1;
}