OpenCv未定义引用`cv :: [英] OpenCv undefined reference to `cv::

问题描述

我是OpenCv的新人。我正在使用Eclipse C / C ++。当我尝试运行这个示例代码时，我面临着这些错误。我该怎么办来解决这个问题？配置时有什么问题吗？

  #using namespace std; 
 #using namespace cv; 
 
 int main（int argc，const char ** argv）
 {
 Mat img = imread（MyPic.JPG，CV_LOAD_IMAGE_UNCHANGED）; 
 if（img.empty（））//检查图像是否加载
 {
 cout<<< 错误：图像无法加载.. !! << ENDL; 
 // system（pause）; //等待按键
 return -1; 
} 
 namedWindow（MyWindow，CV_WINDOW_AUTOSIZE）; //创建名为MyWindow的窗口
 imshow（MyWindow，img）; / 
 waitKey（0）; //等待无限时间的按键
 destroyWindow（MyWindow）; //用名称破坏窗口，MyWindow
 
 return 0; 
} 
 
 
 16:11:28 ****增量构建项目的调试OpenCv **** 
信息：内部构建器用于构建
 g ++-IC：\\opencv\\build\\include-O0 -g3 -Wall -c -fmessage-length = 0 -osrc\\OpenCv.o ..\\src\\OpenCv.cpp
 g ++-LC：\\opencv\\build\\x86\\vc12\\\\ LIB -o OpenCv.exe src\\OpenCv.o -lopencv_calib3d249 -lopencv_contrib249 -lopencv_core249 -lopencv_features2d249 -lopencv_flann249 -lopencv_gpu249 -lopencv_highgui249 -lopencv_imgproc249 -lopencv_legacy249 -lopencv_ml249 -lopencv_nonfree249 -lopencv_objdetect249 -lopencv_ocl249 -lopencv_photo249 -lopencv_stitching249 -lopencv_superres249  - lopencv_ts249 -lopencv_video249 -lopencv_videostab249 
 src\OpenCv.o：在函数`main'中：
 C：\Users\ayberk101\workspace\OpenCv\Debug/../ src / OpenCv .cpp：10：未定义的引用`cv :: i mread（std :: string const& int）'
 C：\Users\ayberk101\workspace\OpenCv\Debug/../ src / OpenCv.cpp：19：undefined reference to`cv :: namedWindow（std :: string const& int）'
 C：\Users\ayberk101\workspace\OpenCv\Debug/../ src / OpenCv.cpp：20：未定义引用`cv :: _ InputArray :: _ InputArray（cv :: Mat const&）'
 C：\Users\ayberk101\workspace\OpenCv\Debug/../ src / OpenCv.cpp：20：未定义的引用`cv :: imshow（std :: string const& cv :: _ InputArray const&）'
 C：\Users\ayberk101\workspace\OpenCv\Debug /../ src /OpenCv.cpp:22：未定义的引用`cv :: waitKey（int）'
 C：\Users\ayberk101\workspace\OpenCv\Debug/../ src / OpenCv.cpp： 24：undefined reference to`cv :: destroyWindow（std :: string const&）'
 src\OpenCv.o：在函数`ZN2cv3MatD1Ev'中：
 C：/ opencv / build / include / opencv2 /core/mat.hpp:278：未定义的引用`cv :: fas tFree（void *）'
 src\OpenCv.o：在函数`ZN2cv3Mat7releaseEv'中：
 C：/opencv/build/include/opencv2/core/mat.hpp：367：undefined reference to` cv :: Mat :: deallocate（）'
 collect2.exe：错误：ld返回1退出状态
  

解决方案

问题1：您将不得不包含opencv / c ++头文件使其工作：

  #includeopencv2 / core / core.hpp
 #includeopencv2 / imgproc / imgproc.hpp
 #includeopencv2 / highgui / highgui.hpp
 #using namespace cv; 
 
 #include< iostream> 
 #using namespace std; 
 
 int main（）{
 ... 
  

---

那么，问题2：你不能用mingw使用vc12 libs。 （它是一个不同的编译器）

opencv没有更多的prebuild mingw库，所以在做任何其他的之前，你将不得不 build 使用cmake在本地使用opencv lib。

---

再次，你真的需要使用mingw / eclipse？ （vs express仍然是免费的）

I am new at OpenCv. I am using Eclipse C/C++. When i try to run this sample code i faced with these errors. What should i do to solve this problem? Is there any problem at configurating ?

#using namespace std;
#using namespace cv;

    int main( int argc, const char** argv )
    {
         Mat img = imread("MyPic.JPG", CV_LOAD_IMAGE_UNCHANGED); 
         if (img.empty()) //check whether the image is loaded or not
         {
              cout << "Error : Image cannot be loaded..!!" << endl;
              //system("pause"); //wait for a key press
              return -1;
         }
         namedWindow("MyWindow", CV_WINDOW_AUTOSIZE); //create a window with the name "MyWindow"
         imshow("MyWindow", img); /
         waitKey(0); //wait infinite time for a keypress
         destroyWindow("MyWindow"); //destroy the window with the name, "MyWindow"

         return 0;
    }


16:11:28 **** Incremental Build of configuration Debug for project OpenCv ****
Info: Internal Builder is used for build
g++ "-IC:\\opencv\\build\\include" -O0 -g3 -Wall -c -fmessage-length=0 -o "src\\OpenCv.o" "..\\src\\OpenCv.cpp" 
g++ "-LC:\\opencv\\build\\x86\\vc12\\lib" -o OpenCv.exe "src\\OpenCv.o" -lopencv_calib3d249 -lopencv_contrib249 -lopencv_core249 -lopencv_features2d249 -lopencv_flann249 -lopencv_gpu249 -lopencv_highgui249 -lopencv_imgproc249 -lopencv_legacy249 -lopencv_ml249 -lopencv_nonfree249 -lopencv_objdetect249 -lopencv_ocl249 -lopencv_photo249 -lopencv_stitching249 -lopencv_superres249 -lopencv_ts249 -lopencv_video249 -lopencv_videostab249 
src\OpenCv.o: In function `main':
C:\Users\ayberk101\workspace\OpenCv\Debug/../src/OpenCv.cpp:10: undefined reference to `cv::imread(std::string const&, int)'
C:\Users\ayberk101\workspace\OpenCv\Debug/../src/OpenCv.cpp:19: undefined reference to `cv::namedWindow(std::string const&, int)'
C:\Users\ayberk101\workspace\OpenCv\Debug/../src/OpenCv.cpp:20: undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
C:\Users\ayberk101\workspace\OpenCv\Debug/../src/OpenCv.cpp:20: undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
C:\Users\ayberk101\workspace\OpenCv\Debug/../src/OpenCv.cpp:22: undefined reference to `cv::waitKey(int)'
C:\Users\ayberk101\workspace\OpenCv\Debug/../src/OpenCv.cpp:24: undefined reference to `cv::destroyWindow(std::string const&)'
src\OpenCv.o: In function `ZN2cv3MatD1Ev':
C:/opencv/build/include/opencv2/core/mat.hpp:278: undefined reference to `cv::fastFree(void*)'
src\OpenCv.o: In function `ZN2cv3Mat7releaseEv':
C:/opencv/build/include/opencv2/core/mat.hpp:367: undefined reference to `cv::Mat::deallocate()'
collect2.exe: error: ld returned 1 exit status

解决方案

problem1: you will have to include opencv / c++ header files to make it work:

#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#using namespace cv;

#include <iostream>
#using namespace std;

int main() {
...

---

then, problem2: you cannot use the vc12 libs with mingw. (it's a different compiler)

there are no more prebuild mingw libs for opencv, so, before doing anything else, you will have to build the opencv libs locally using cmake.

---

again, do you really need to use mingw / eclipse ? (vs express is still free)

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