public function

I'm a visual basic programmer and i've made a software that is trying to use
a Visual C++ dll, named memctrl.
i've implemented the code in the memctrl.cpp file and i'm trying to access
the function i've made in the .cpp through Visual Basic 2005. I just can't
access them. If i use some functions that are implemented in the memctrl.h,
then i have access to them.
My doubt is:
  I've learn that in Visual C++ we declare the functions header in the .h
file and we implement the code in the .cpp file. What am i doing wrong?

the code:
memctrl.h

#pragma once

#include <iostream>
#include <iomanip>
#include <atlstr.h>

using namespace System;

namespace memctrl {

    public interface class IContainer
    {
        virtual int retornaIndice();

    };

    //public ref class clsMemCtrl//:IContainer
    public class clsMemCtrl//:IContainer
    {
        // TODO: Add your methods for this class here.

    public:

        void filldots(void);
  
    protected:

    };
}

memctrl.cpp:

// This is the main DLL file.

#include "stdafx.h"

#include "memctrl.h"

#include <string.h>

using namespace std;
struct PONTOSCEFALOMETRICOS
{
    int IDPonto;
    CString NomePonto;
    CString AbreviaturaPonto;
    CString NomeImg;
    CString NomeVideo;
    CString Descricao;
    bool VTO;
    CString ImagemMaximizada;
    int CoordenadaX;
    int CoordenadaY;
    int Base;
    int Calculado;
    CString ObservacoesParaProgramador;
    int OrdemApresentacao;
    int TipoPonto;
    int Seccao;
    int Perfil;
}Arr[184];

int retornaPontoDeterminadoIndice(int Indice)
{

    return 0;
}

       

 void filldots(void)
{
     Arr[0].IDPonto=1;
     Arr[0].NomePonto ="Basion";
     Arr[0].AbreviaturaPonto ="Ba";
     Arr[0].NomeImg="Basio.jpg";
     Arr[0].NomeVideo="Basio.avi";
     Arr[0].Descricao="Ponto mais inferior do contorno anterior do foramen
Magnum";
     Arr[0].VTO="False";
     Arr[0].ImagemMaximizada="";
     Arr[0].CoordenadaX=0;
     Arr[0].CoordenadaY=0;
     Arr[0].Base=0;
     Arr[0].Calculado=0;
     Arr[0].ObservacoesParaProgramador="";
     Arr[0].TipoPonto=0;
     Arr[0].Seccao=0;
     Arr[0].Perfil=0;

    ...
}