#ifndef _DLL_H_
#define _DLL_H_
 
#if BUILDING_DLL
# define DLLIMPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */
 
DLLIMPORT void welcome();
 
class DLLIMPORT DllClass
{
  public:
    DllClass();
    virtual ~DllClass(void);
 
  private:
 
};
 
 
#endif /* _DLL_H_ */

 
/* Replace "dll.h" with the name of your header */
#include "dll.h"
#include <windows.h>
#include<iostream>
using namespace std;
DllClass::DllClass()
{
 
}
 
 
DllClass::~DllClass ()
{
 
}
 
DLLIMPORT void welcome()
{
  cout << " Welcome home " << endl;
}
 
BOOL APIENTRY DllMain (HINSTANCE hInst     /* Library instance handle. */ ,
                       DWORD reason        /* Reason this function is being called. */ ,
                       LPVOID reserved     /* Not used. */ )
{
    switch (reason)
    {
      case DLL_PROCESS_ATTACH:
        break;
 
      case DLL_PROCESS_DETACH:
        break;
 
      case DLL_THREAD_ATTACH:
        break;
 
      case DLL_THREAD_DETACH:
        break;
    }
 
    /* Returns TRUE on success, FALSE on failure */
    return TRUE;
}

 
#include <cstdlib>
#include <iostream>
#include<project3.dll> // <<---------- the dll file include 
 
using namespace std;
 
int main(int argc, char *argv[])
{
    welcome();           // <<------ this function in the DLL
    system("PAUSE");
    return EXIT_SUCCESS;
}

 
3 \including dll\main.cpp project3.dll: No such file or directory. 
9 \including dll\main.cpp `welcome' undeclared (first use this function)