OpenCV头文件包含问题

     opencv从2.2版本以后<opencv root>include下有两个文件夹 opencv 和opencv2。从官方的意思来看，它逐渐喜欢用opencv2里面的那种包含头文件的方式。

注意：<opencv root>是opencv2.2安装路径。每个人的路径都可能有所不同！！

Opencv.hpp本身是一个头文件，它包含了opencv全部的头文件。有图有真相：

#ifndef __OPENCV_ALL_HPP__  
  
#define __OPENCV_ALL_HPP__  
  
#include "opencv2/core/core_c.h"  
  
#include "opencv2/core/core.hpp"  
  
#include "opencv2/flann/flann.hpp"  
  
#include "opencv2/imgproc/imgproc_c.h"  
  
#include "opencv2/imgproc/imgproc.hpp"  
  
#include "opencv2/video/tracking.hpp"  
  
#include "opencv2/video/background_segm.hpp"  
  
#include "opencv2/features2d/features2d.hpp"  
  
#include "opencv2/objdetect/objdetect.hpp"  
  
#include "opencv2/calib3d/calib3d.hpp"  
  
#include "opencv2/ml/ml.hpp"  
  
#include "opencv2/highgui/highgui_c.h"  
  
#include "opencv2/highgui/highgui.hpp"  
  
#include "opencv2/contrib/contrib.hpp"  
  
#endif  

　   每次下载opencv的新版本时，都需要重新写头文件，更改链接库配置，很麻烦有木有？下面这个头文件是我在别人的代码中淘出来的，很不错，与大家分享~（具体作者忘记了，不好意思啊）

　　作者很巧妙地利用Opencv的版本信息定义了一个宏，无论你的Opencv是243还是246都能够完美支持，以后再不用担心更新版本带来的问题了，另：对于比较老的Opencv版本可能有个别lib的名称不对，修改一下就可以了

#pragma once

#include "targetver.h"

#include <stdio.h>
#include <tchar.h>
#include <iostream>
#include <fstream>

#include <opencv2/opencv.hpp>

#define CV_VERSION_ID       CVAUX_STR(CV_MAJOR_VERSION) CVAUX_STR(CV_MINOR_VERSION) CVAUX_STR(CV_SUBMINOR_VERSION)

#ifdef _DEBUG
#define cvLIB(name) "opencv_" name CV_VERSION_ID "d"
#else
#define cvLIB(name) "opencv_" name CV_VERSION_ID
#endif

#pragma comment( lib, cvLIB("core") )
#pragma comment( lib, cvLIB("imgproc") )
#pragma comment( lib, cvLIB("highgui") )
#pragma comment( lib, cvLIB("flann") )
#pragma comment( lib, cvLIB("features2d") )
#pragma comment( lib, cvLIB("calib3d") )
#pragma comment( lib, cvLIB("gpu") )
#pragma comment( lib, cvLIB("legacy") )
#pragma comment( lib, cvLIB("ml") )
#pragma comment( lib, cvLIB("objdetect") )
#pragma comment( lib, cvLIB("ts") )
#pragma comment( lib, cvLIB("video") )
#pragma comment( lib, cvLIB("contrib") )
#pragma comment( lib, cvLIB("nonfree") )

version.hpp库自带的：

#ifndef __OPENCV_VERSION_HPP__
#define __OPENCV_VERSION_HPP__

#define CV_VERSION_MAJOR    3
#define CV_VERSION_MINOR    1
#define CV_VERSION_REVISION 0
#define CV_VERSION_STATUS   ""

#define CVAUX_STR_EXP(__A)  #__A
#define CVAUX_STR(__A)      CVAUX_STR_EXP(__A)

#define CVAUX_STRW_EXP(__A)  L#__A
#define CVAUX_STRW(__A)      CVAUX_STRW_EXP(__A)

#define CV_VERSION          CVAUX_STR(CV_VERSION_MAJOR) "." CVAUX_STR(CV_VERSION_MINOR) "." CVAUX_STR(CV_VERSION_REVISION) CV_VERSION_STATUS

/* old  style version constants*/
#define CV_MAJOR_VERSION    CV_VERSION_MAJOR
#define CV_MINOR_VERSION    CV_VERSION_MINOR
#define CV_SUBMINOR_VERSION CV_VERSION_REVISION

#endif