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);

Visual Studio 2012 v.s. Opencv 3.0 v.s. XP

Opencv 3.0 static(for windows)安裝注意事項

1. Download Opencv 3.0A

http://opencv.org/downloads.html

2. 執行opencv-3.0.0，並選擇安裝位置

3. 安裝Cmake(注意作業系統與位元)

https://cmake.org/download/

4. CMake Stage

4.1. 選擇Opencv source code 位置，此位置為步驟2指定之位置

(i.e. …/opencv/sources)

2. 選擇目標輸出位置(新增資料夾)
3. 按下Conifgure

4. 選擇Compiler(以visual studio 11 2012 32 bit 為例)

5. 產生static lib設定(如果需要產生dll，請省略此步驟)

BUILD_SHARE_LIBS取消勾選

BUILD_WITH_STATIC_CRT勾選

6. Extra modules設定(如果需要使用extract module，請省略此步驟)
1. 請至https://github.com/itseez/opencv_contrib 下載extra modules

2. 下載後解壓縮。回到CMAKE點選OPENCV_EXTRA_MODULES_PATH，選取先前解壓縮路徑…\opencv_contrib-master\opencv_contrib-master\modules

7. 如果有執行4.6或4.7，請再按一次Generate按鈕，設定才會被產生

8. 完成上述動作後，請按Generate按鈕，產生visual studio project(此範例使用VS2012 update 4)

5. Visual studio 2012 stage

5. 開啟visual studio，檔案(F)->開啟(O)->專案/方案(P)，開啟步驟4產生ALL_BUILD.vcxproj

2. 選擇release模式(選擇release模式是因為，VS在產生library時候，會對執行效能進行最佳化)

3. (重要)，若需要產生Windows XP可以用的static library或dll，需要進行以下步驟
1. 請將所有3rdparty、modules、object_libraries內容，屬性(R)->組態設定->一般->平台工具組改為Visual Studio 2012 - Windows XP (v110_xp)。如果平台工具組沒有此設定，請將VS2012更新至最新版。

4. 滑鼠右鍵點選INSTALL，點選建置，此時產生lib或dll的程序開始。

5. 完成後可以看到產生的lib

6. 使用Opencv 3.0

以下檔案可在步驟4.2中的資料夾中獲得

6. 使用函示庫

使用static lib，其中可在…\install\x86\vc11\staticlib找到。若少加入ippicvmt.lib，Compile可能會出現ipp之類的錯誤。

IlmImf.lib	opencv_hal300.lib	opencv_ts300.lib	ComCtl32.lib
libjasper.lib	opencv_highgui300.lib	opencv_video300.lib	Gdi32.lib
libjpeg.lib	opencv_imgcodecs300.lib	opencv_videoio300.lib	kernel32.lib
libpng.lib	opencv_imgproc300.lib	opencv_videostab300.lib	Ole32.lib
libtiff.lib	opencv_ml300.lib	opencv_xfeatures2d300.lib	OleAut32.lib
libopenblas.dll.a	opencv_objdetect300.lib	opencv_xobjdetect300.lib	shell32.lib
opencv_calib3d300.lib	opencv_photo300.lib	opencv_xphoto300.lib	User32.lib
opencv_core300.lib	opencv_shape300.lib	zlib.lib	Vfw32.lib
opencv_features2d300.lib	opencv_stitching300.lib	ippicvmt.lib
opencv_flann300.lib	opencv_superres300.lib	AdvAPI32.lib

2. Header:

…\install\include

… \install\include\opencv

… \install\include\opencv2

7. 常見問題

1. 出現unresolved external symbol將所有6.1的lib都加入程式裡
2. 出現error LNK2038: 偵測到 'RuntimeLibrary' 不符: 'MT_StaticRelease' 值與 'MD_DynamicRelease' 值。點選專案名稱，滑鼠按右鍵->屬性->組態屬性->C/C++->程式碼產生->執行階段程式庫，修正為/MT或/MD，改為其中一個。

Reference:

1. Opencv 3.0 http://opencv.org/opencv-3-0.html

2. CMake 3.3.2 https://cmake.org/

3. ippicv http://sourceforge.net/projects/opencvlibrary/files/3rdparty/ippicv/

4. opencv extra module https://github.com/itseez/opencv_contrib