C ++ / CMake：在OpenCV中未定义的引用引用 [英] C++/CMake:Undefined reference to imwrite in OpenCV

问题描述

这是我的CMakeLists.txt：

This is my CMakeLists.txt:

project(proj)
set(OpenCV_DIR "/usr/lib/opencv")
find_package(OpenCV REQUIRED COMPONENTS core imgproc highgui)

include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(test test.cpp>
target_link_libraries(test ${OpenCV_LIBS})

这是我的代码的一部分：

and this is part of my code:

#include <opencv/cv.h>
#include <opencv/cv.hpp>
#include <opencv/highgui.h>
#include <opencv/highgui.hpp>

using namespace cv;
using namespace std;

int main(int argv, char **argc)
{       
    //other code
    Mat img(height, width, CV_8UC3);
    //other code

    imwrite("/path", img);
    namedWindow( "Display window", 1 );
    imshow("Display window", img);

    waitKey(0);                                          
    return 0;

}

而我得到的错误消息是：

and the error message I get is:

undefined reference to cv::imwrite(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::Mat const&, std::vector<int, std::allocator<int> > const&)`

imshow可以正常工作，所以我不知道为什么imwrite给我一个错误。

imshow works correctly, so I have no clue why imwrite is giving me an error.

编辑：

g++ -o test_1 test_1.cpp `pkg-config opencv --cflags --libs`

给出相同的错误。

推荐答案

在您的 find_package（）命令中，您仅从 OpenCV 软件包，而您需要的软件包（ imgcodecs 却提供了 imwrite（））不在

In your find_package() command, you are only selecting some specific modules from the OpenCV package, and the one you need (imgcodecs which provides imwrite()) is not in the list.

尝试将其更改为：

find_package(OpenCV)

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