Trying to build a dll for use in rpg maker (sorry for my english ¬¬)

[newold]

ok, i do this code in C in visual studio:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ClassLibrary1
{
    public class Sum
    {
        public double SumNumber(double num1, double num2)
        {
            return num1 + num2;
        }
    }

    
}

now, in rpg maker, i try use the dll as well

Win32API.new('ClassLibrary1','SumNumber','ll','l')

but i get error: GetProcAddress: SumNumber or SumNumberA

so i think my code is missing something.


Question:

Someone know that code I need to put in the DLL to avoid that error?

Question 2

Someone could put the code in the dll to build a "Hello World!" and in the RPG maker call this as well

helloworld= Win32API.new('HelloWorld','talkme','','P')
p helloworld.call   => Hello World!

thanks all and sorry for my english

PS) These examples serve me long to start building some dll that I have thought

[Blizzard]

You can only load dlls that have been compiled with a C compiler. C++ and C# code won't work.
Also, native code dlls (C, C++, old Visual Basic versions) are different than .NET bytecode dlls (VB, C#, etc.).

[newold]

ok very thanks, i download a compiler Dev-C and i have the DLL working now  

now I can investigate further to get the code that I want in the dlls

grateful Blizzard  



EDIT:

I have a problem here now:


My DLL:

Dll.h

#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 double sumNums (double,double);


#endif /* _DLL_H_ */

Main.c

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

DLLIMPORT double sumNums (double n1, double n2)
{
    return (n1 + n2);
}


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;
}

compile without error >> Proyect.dll

now in rpg maker

s = Win32API.new('Proyect','sumNums','ll','l')
p "5 + 8 = " + s.call(5,8).to_s

Error: it print >> 5 + 8 = 8 << ???????

where is error in dll?


EDIT

if i change DLLIMPORT double sumNums (double n1, double n2) by DLLIMPORT int sumNums (int n1, intn2) it works, but if i use double or float don't wotks and i dont know why 

[Blizzard]

Using LL for the input means it's the datatype "long". You have to use "double" as argument types and return type.