[Dev-C++] explicit linking of DLL

[Dmitry S. <si...@si...>]

Hello, dev-cpp-users.

I must import some class from my dll into main program using explicit
linking. DLL sources consists of 2 files

// ========= number.h ===============
#ifndef _NUMBER_H_
#define _NUMBER_H_

#if BUILDING_DLL
# define DLLIMPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */

class DLLIMPORT Number
{
  public:
    Number();
    virtual ~Number();
    virtual int Get();
    virtual void Set( const int );
  private:
    int number;
};

extern "C" DLLIMPORT Number* CreateInstance_Number();

#endif // _NUMBER_H_

and

// ========= dllmain.cpp ===============
#include "number.h"
#include <windows.h>

Number::Number():
   number( 7 )
{
}
Number::~Number ()
{
}

int Number::Get()
{
   return number;
}

void Number::Set( const int n )
{
   number = n;
}

Number* CreateInstance_Number()
{
   return new Number();
}

int WINAPI DllMain (HINSTANCE hInst, DWORD reason, LPVOID reserved )
{
    switch (reason){
      case DLL_PROCESS_ATTACH:
      case DLL_PROCESS_DETACH:
      case DLL_THREAD_ATTACH:
      case DLL_THREAD_DETACH:
        break;
    }
    return TRUE;
}



Main program consists of the only main.cpp

// ========= dllmain.cpp ===============
#include <iostream>
#include <stdlib.h>
#include "number.h"

using namespace std;

int main(int argc, char *argv[])
{
        HMODULE hMod;
        typedef Number* (*pCreateNumber)();

        hMod = LoadLibrary("mydll.dll");
        if( !hMod )
                cerr << "Failed to Load the dll: " << GetLastError() << endl;

        pCreateNumber create = (pCreateNumber)GetProcAddress( hMod, "CreateInstance_Number" );

        Number *num = create();
        num->Set(172);
        cout << "Value = " << num->Get() << endl;
        system("PAUSE");
        return 0;
}



Both DLL and main program are compiled and linked without errors
But when I`m trying to run a program, it is crushing in a line
        Number *num = create();

What do I wrong?


-- 
kind regards
Dmitry