c++ - OpenCV undefined reference (带有vector <KeyPoint>的FileStorage)

最近一直在使用一些OpenCV，但是遇到了一个有趣的问题。我有一个简单的类来存储数据以及将数据读写到文件中。

这是写函数:

cv::Mat descriptors;
vector<cv::KeyPoint> keypoints;

void EventType::write(cv::FileStorage outfile) {
    outfile << "descriptorId" << descriptors;
    outfile << "keypointId" << keypoints;
}

该问题在链接时出现:

EventType.cpp.o: In function cv::FileStorage& cv::operator<< <std::vector<cv::KeyPoint,
    std::allocator<cv::KeyPoint> > >(cv::FileStorage&, std::vector<cv::KeyPoint,
    std::allocator<cv::KeyPoint> > const&)':
EventType.cpp:(.text+0xc99): undefined reference to `cv::write(cv::FileStorage&,
    std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&,
    std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> > const&)'

但是，链接时也建议以下替代方法:

/opencv2/core/operations.hpp:2707: note: candidates are: void cv::write(cv::FileStorage&, const std::string&, int)
/opencv2/core/operations.hpp:2708: note:                 void cv::write(cv::FileStorage&, const std::string&, float)
/opencv2/core/operations.hpp:2709: note:                 void cv::write(cv::FileStorage&, const std::string&, double)
/opencv2/core/operations.hpp:2710: note:                 void cv::write(cv::FileStorage&, const std::string&, const std::string&)
/opencv2/core/operations.hpp:2787: note:                 void cv::write(cv::FileStorage&, const cv::Range&)
/opencv2/core/operations.hpp:2856: note:                 void cv::write(cv::FileStorage&, const std::string&, const cv::Range&)
/opencv2/core/operations.hpp:2902: note:                 void cv::write(cv::FileStorage&, const std::string&, const cv::Mat&)
/opencv2/core/operations.hpp:2903: note:                 void cv::write(cv::FileStorage&, const std::string&, const cv::SparseMat&)
/opencv2/features2d/features2d.hpp:112: note:                 void cv::write(cv::FileStorage&, const std::string&, const std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&)

在我看来，/opencv2/features2d/features2d.hpp中的原型(prototype)非常合适。有什么建议么？

最佳答案

如果链接器说“ undefined reference ”，则说明编译步骤已经完成，这意味着编译器将您的函数视为有效。

尝试链接所有的opencv库，看看是否会改变结果。还要检查您使用的 header 与您尝试链接的库具有相同的版本。