Visual Studio C++ 2012 DLL V.S. C++ Builder XE DLL

1. VC dll
   
   These is sample code for Created C Style DLL. Especially, the implementing function is used C++ class. If any Result want to catch,  using Pointer(call by pointer) or reference (call by reference) is enabled. Any "Create Pointer" in "VC dll" is only deleted by VC dll itself.
   
   
   //GlobalHeader.h
   #pragma once
   
   
   class A_Header
   {
   public:
             A_Header() {};
             virtual ~A_Header() {};
             virtual int ADD( int a, int b)=0;
   }
   //-------------------------------------------------------------------------------------------------------------
   #ifdef DLLDIR_EX
      #define API __declspec(dllexport)   // export DLL information
   #else
      #define API __declspec(dllimport)   // import DLL information
   #endif
   
   
   typedef void * PTR;
   
   
   extern "C"
   {
             API PTR DEMO_Create();
             API void DEMO_Free(PTR aThis);
             //Define Functions
             API int DEMO_ADD( PTR aThis, int a, int b);
   }
   
   
   
   
   
   
   //GlobalHeader.cpp
   #include " GlobalHeader..h"
   #include "TEST.h"
   #define THIS reinterpret_cast< Header *>( aThis )
   extern "C"
   {
             //-------------------------------------------------------------------------------------------------
             PTR DEMO_Create()
             {
                      return new TEST();
             }
             //-------------------------------------------------------------------------------------------------
             void DEMO_Free( PTR aThis)
             {
                      delete THIS;
             }
             //-------------------------------------------------------------------------------------------------
             int DEMO_ADD( PTR aThis, int a, int b)
             {
                      return THIS->ADD( a, b);
             }
   }
     
   //TEST.h
   //Define Class and Implement
   
   

   #include "GlobalHeader..h"
   #include <iostream>
   class TEST :: public A_Header
   {
             TEST();
             virtual ~TEST();
             virtual int ADD( int a, int b);
   }
   
   
   //TEST.cpp
   TEST::TEST() { std::cout << “create ptr” << endl; }
   TEST::~TEST() { std::cout << “delete ptr” << endl; }
   int TEST::ADD( int a, int b) { return (a + b); }
2. C++ builder
   
   How to used dll of step1? In below demo, the name of dll is test.dll.
   
   2.1. Getting c++ builder style lib, entered below command in command window.
   implib -a btest.lib test.dll
   2.2. Include GlobalHeader.h
   2.3. Create PTR
   PTR ptr = DEMO_Create();
   2.4. Used Function
   int result = DEMO_ADD( 1, 2);
   2.5. Delete PTR
   DEMO_Free(ptr);