eclipse OpenCv 未定义对 `cv:: 的引用
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OpenCv undefined reference to `cv::
提问by ayberkzeray
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 ?
我是 OpenCv 的新手。我正在使用 Eclipse C/C++。当我尝试运行此示例代码时，我遇到了这些错误。我该怎么做才能解决这个问题？配置有问题吗？
#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()) //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
回答by berak
problem1: you will have to include opencv / c++ header files to make it work:
问题 1：您必须包含 opencv / c++ 头文件才能使其工作：
#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)
然后，问题 2：您不能将 vc12 库与 mingw 一起使用。（这是一个不同的编译器）
there are no more prebuild mingw libs for opencv, so, before doing anything else, you will have to buildthe opencv libs locally using cmake.
没有更多用于 opencv 的预构建 mingw 库，因此，在执行其他任何操作之前，您必须使用 cmake 在本地构建opencv 库。
again, do you really needto use mingw / eclipse ? (vs express is still free)
再次，你真的需要使用 mingw / eclipse 吗？（vs express 还是免费的）
