Thread: loading a dll with classes

Hi, ive been programming c++ (up from C) for two days now, and i want to use a class in a dll. Right now im just using the skeleton dll provided by dev-cpp with an add function in there, so i hope i havent stuffed up what i did change.

Code:

/* Replace "dll.h" with the name of your header */
#include "dll.h"
#include <windows.h>

DllClass::DllClass()
{

}

int DllClass::add(int a, int b)
{
   return(a + b);
}

DllClass::~DllClass ()
{

}


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;
}

and then my executable code

Code:

#include <iostream>
#include <windows.h>

typedef int (*AddFunc)(int,int);


using namespace std;
int main(int argc, char *argv[])
{
   AddFunc _AddFunc;
   HINSTANCE hInstLibrary = LoadLibrary("dllLoadingTestdll.dll");

   if (hInstLibrary == NULL)
   {
      printf("o o");
      FreeLibrary(hInstLibrary);
   }

   _AddFunc = (AddFunc)GetProcAddress(hInstLibrary, "DllClass::add");

   if ((_AddFunc == NULL))
   {
      printf("O O");
      FreeLibrary(hInstLibrary);
   }
   
   
   //printf("%d\n", _AddFunc(23, 43));
   getchar();

   FreeLibrary(hInstLibrary);

   return(0);
}

which i also copied for the most part off the net, so i hope i didnt stuff this up either.

anyway, what i want to know is how to get the function address for my add function.
_AddFunc == NULL is returning true, and its ouputting "O O" so thats where the problem is.