A problem on Linking error with dll containing a class.

I made a DLL with Dev-C++, the DLL contains a class and I tried to use the member functions of the Class in a C++ Builder2009 program,
.......................
# include <mydll.h>
....................
Toto *pGogo;
HINSTANCE hinst=LoadLibrary("mydll.dll");
pGogo=(Toto*) GetProcAddress(hinst,"Toto");
pGogo->Print();
FreeLibrary(hinst);
..............
and the mydll.h is:

#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 */


# include <iostream>

class DLLIMPORT Toto{
public:
int x;
void Print(void);
};

#endif

but there is a linking error:
[ILINK32 Error] Error: Unresolved external '__stdcall Toto::Print()' referenced from D:\RAD STUDIO\PROJECTS\DEBUG\UNIT1TEST.OBJ

But when I make a dll without a class, and use the functions from the dll in my main program,the program can be executed.
And I do not know how to solve it.
Can any one with kindness help me?

So where is the implementation, such as

You are going about this the hard way. When you compiled/linked the DLL you should have also gotten a mydll.lib file. All you need to do is link to mydll.lib and you should be able to use your Toto class just like any other by declaring a variable of that type without having to explicitly load and initialize the thing:

Toto instanceOfToTo ;

You can go about this the hard way and load the thing explicitly, but it's a major head-ache you probably don't need to deal with. But here's a link to one method that should work:

http://www.codeguru.com/cpp/w-p/dll...rticle.php/c123

About the only time you might need to do this is if you are writing an application that supports loading/unloading plug-ins using DLL's.