OpenCV未定义对‘cv：：imread(cv：：String const&，int)’的引用
我无法让opencv在C++代码中工作。我已经阅读了所有类似的问题，但还没有让我的代码编译。
我从源代码安装了OpenCV，并包含了-D OPENCV_GENERATE_PKGCONFIG=ON选项，我正在尝试使用一个简单的OpenCV示例。
代码如下：
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
using namespace cv;
int main()
{
std::string image_path = "/data/000001.jpg";
Mat img = imread(image_path, IMREAD_COLOR);
if(img.empty())
{
std::cout << "Could not read the image: " << image_path << std::endl;
return 1;
}
imshow("Display window", img);
int k = waitKey(0); // Wait for a keystroke in the window
if(k == 's')
{
imwrite("starry_night.png", img);
}
return 0;
}尝试使用：$/usr/bin/g++ -g pkg-config --cflags --libs opencv main.cpp进行编译时，会导致所有OpenCV调用出现“未定义的引用”错误:/OpenCV/cpp/play/main.cpp:9:对‘cv：：imread(cv：：String const&，int)’的未定义引用
运行pkg-config --cflags -libs opencv返回：
pkg-config --cflags -libs opencv -I/usr/local/include/opencv -I/usr/local/include -L/usr/local/lib -lopencv_stitching -vlopencv_superres -lopencv_videostab -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dpm -lopencv_face -lopencv_photo -lopencv_freetype -lopencv_fuzzy -lopencv_hdf -lopencv_hfs -lopencv_img_hash -lopencv_line_descriptor -lopencv_optflow -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_viz -lopencv_phase_unwrapping -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_dnn -lopencv_plot -lopencv_xfeatures2d -lopencv_shape -lopencv_video -lopencv_ml -lopencv_ximgproc -lopencv_xobjdetect -lopencv_objdetect
我还尝试使用以下文件使用cmake构建代码：
set(CMAKE_VERBOSE_MAKEFILE ON)
cmake_minimum_required(VERSION 3.16)
project(play)
set(CMAKE_CXX_STANDARD 14)
find_package(OpenCV REQUIRED)
message(STATUS "OpenCV_INCLUDE_DIRS = ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")
add_executable(play main.cpp)这是OpenCV_LIB应该是什么样子的吗？是不是应该有一条路？
-- OpenCV_INCLUDE_DIRS = /usr/include;/usr/include/opencv
-- OpenCV_LIBS = opencv_calib3d;opencv_core;opencv_features2d;opencv_flann;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_shape;opencv_stitching;opencv_superres;opencv_video;opencv_videoio;opencv_videostab;opencv_viz;opencv_aruco;opencv_bgsegm;opencv_bioinspired;opencv_ccalib;opencv_datasets;opencv_dpm;opencv_face;opencv_freetype;opencv_fuzzy;opencv_hdf;opencv_line_descriptor;opencv_optflow;opencv_phase_unwrapping;opencv_plot;opencv_reg;opencv_rgbd;opencv_saliency;opencv_stereo;opencv_structured_light;opencv_surface_matching;opencv_text;opencv_ximgproc;opencv_xobjdetect;opencv_xphoto
-- Configuring done谢谢你的帮助。
回答 1
Stack Overflow用户
发布于 2020-05-30 13:21:12
谢谢你的建议。约翰是对的。这就解决了这个问题：
g++ -g main.cpp `pkg-config --libs opencv`pkg-config需要在源文件之后。
https://stackoverflow.com/questions/62098479
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![cv2 imread()函数[通俗易懂]](https://ask.qcloudimg.com/raw/yehe-b343ae46ed357/etqbd3d3pt.png)
![关于cv::imread读取图片类型的初探[通俗易懂]](https://ask.qcloudimg.com/http-save/yehe-8223537/e2742d8d8760d1bd68c990c50d238c01.jpg)
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