Here is the ARDLLWrapper.h file that i include in my main.h file
When i compile this file with its relative *.cpp, it's ok, but when i
try to compile my application. It generates the error i meant before.
it seems that it is known problem, but i did not find the solution on
internet for now.

do you have an idea ?

//--- ARDLLWrapper.h --
#include <windows.h>
using namespace System;
using namespace System::Runtime::InteropServices;
//---------------------------------------------------------------------------
#ifndef CARDLLWrapperH
#define CARDLLWrapperH
//------------------------------------------------------------------------------
public ref class CARDLLWrapper
{
 private:
 public:
 CARDLLWrapper();
 ~CARDLLWrapper();
   
 [DllImportAttribute(L"frmwrk_lc.dll",
CallingConvention=CallingConvention::ThisCall,
CharSet = CharSet::Auto,
EntryPoint = L"DLL_GetString")]

 static LPTSTR DLL_GetString(HMODULE hwnd_DLL, long Index);

 bool InitLocalization(LPTSTR dll_name);

 LPTSTR STR(long Index);
};

//---------------------------------------------------------------------------
#endif