embedding dlls

Although I've seen similar hints and examples, I've yet to get this to work - must be something simple I'm missing (or messing up ;) ). I have two simple dlls, and I want to be able to call a function in one from the other:

Here is the first one : seconddll.cpp

Code:

---

#include "stdafx.h"
#define BUILD_SECONDDLL
#include "seconddll.h"

BOOL APIENTRY DllMain( HANDLE hModule,
                      DWORD  ul_reason_for_call,
                      LPVOID lpReserved
                                        )
{
    switch (ul_reason_for_call)
        {
                case DLL_PROCESS_ATTACH:
                case DLL_THREAD_ATTACH:
                case DLL_THREAD_DETACH:
                case DLL_PROCESS_DETACH:
                        break;
    }
    return TRUE;
}


// This is an example of an exported variable
SECONDDLL_API int nSeconddll=0;

// This is an example of an exported function.
SECONDDLL_API int fnSeconddll(void)
{
        return 43;
}

// This is the constructor of a class that has been exported.
// see seconddll.h for the class definition
CSeconddll::CSeconddll()
{
        return;
}

---

and its corresponding header seconddll.h:

Code:

---

#ifdef BUILD_SECONDDLL
#define SECONDDLL_API __declspec(dllexport)
#else
#ifdef USE_SECONDDLL
#define SECONDDLL_API __declspec(dllimport)
#else
#define SECONDDLL_API
#endif
#endif


// This class is exported from the seconddll.dll
class SECONDDLL_API CSeconddll {
public:
        CSeconddll(void);
        // TODO: add your methods here.
};

extern SECONDDLL_API int nSeconddll;

SECONDDLL_API int fnSeconddll(void);

---

Here is the other dll that calls a function from the one above (dlltest.cpp):

Code:

---

// dlltest.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"

#define USE_SECONDDLL
#include "seconddll.h"

#define DLLTEST_EXPORTS
#include "dlltest.h"





BOOL APIENTRY DllMain( HANDLE hModule,
                      DWORD  ul_reason_for_call,
                      LPVOID lpReserved
                                        )
{
    switch (ul_reason_for_call)
        {
                case DLL_PROCESS_ATTACH:
                case DLL_THREAD_ATTACH:
                case DLL_THREAD_DETACH:
                case DLL_PROCESS_DETACH:
                        break;
    }
    return TRUE;
}


// This is an example of an exported variable
DLLTEST_API int nDlltest=0;

// This is an example of an exported function.
DLLTEST_API int fnDlltest(void)
{
        return 42;
}

// This is an example of an exported function.
DLLTEST_API int fnDlltest2nd(void)
{
        int i = fnSeconddll();  // ---->>> trying to call function from another dll
       
        return i;
       
}

// This is the constructor of a class that has been exported.
// see dlltest.h for the class definition
CDlltest::CDlltest()
{
        return;
}

---

and its corresponding header file (dlltest.h):

Code:

---

#ifdef BUILD_SECONDDLL
#define SECONDDLL_API __declspec(dllexport)
#else
#ifdef USE_SECONDDLL
#define SECONDDLL_API __declspec(dllimport)
#else
#define SECONDDLL_API
#endif
#endif

// This class is exported from the seconddll.dll
class SECONDDLL_API CSeconddll {
public:
        CSeconddll(void);
        // TODO: add your methods here.
};

extern SECONDDLL_API int nSeconddll;

SECONDDLL_API int fnSeconddll(void);

---

I have copied secondll.dll and seconddll.lib to the appropriate directories, but still get this message when compiling dlltest.cpp:

dlltest.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl fnSeconddll(void)" (__imp_?fnSeconddll@@YAHXZ)
Debug/dlltest.dll : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Any help?

You have to link the library of the exporting DLL (secondll) to the objects and libraries in your importing DLL (dlltest).
See project settings/link/input/object+library modules!

Thanks! I knew it was something easy...