c++ - 编译opencv程序导致gcc -I/usr/local/lib test.cpp test.cpp :1:10: fatal error: opencv2/core. hpp: No such file or directory

Question

编译opencv程序程序简单包含时出错#include <opencv2/core.hpp>

我用这个命令编译了它

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

compiling opencv in c++

这是一个完整的错误

gcc -I/usr/local/lib test.cpp 
test.cpp:1:10: fatal error: opencv2/core.hpp: No such file or directory
    1 | #include <opencv2/core.hpp>

我通过查看此页面https://docs.opencv.org/2.4/doc/tutorials/introduction/linux_install/linux_install.html#building-opencv-from-source-using-cmake-using-the-command-line来编译并安装opencv

代码来自https://docs.opencv.org/4.x/d3/d50/group__imgproc__colormap.html

我的 opencv so 文件位于/usr/local/lib

错误还说

Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable

但是我搜索了/usr目录没有opencv.pc文件

更新

更新我的编译命令后编译程序此错误抛出

 $g++ -I/usr/local/include/opencv4/ test.cpp 
/usr/bin/ld: /tmp/ccuJvWgF.o: in function `main':
test.cpp:(.text+0xb4): undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
/usr/bin/ld: test.cpp:(.text+0xde): undefined reference to `cv::Mat::empty() const'
/usr/bin/ld: test.cpp:(.text+0x154): undefined reference to `cv::Mat::Mat()'
/usr/bin/ld: test.cpp:(.text+0x1a1): undefined reference to `cv::applyColorMap(cv::_InputArray const&, cv::_OutputArray const&, int)'
/usr/bin/ld: test.cpp:(.text+0x21d): undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'
/usr/bin/ld: test.cpp:(.text+0x254): undefined reference to `cv::waitKey(int)'
/usr/bin/ld: test.cpp:(.text+0x265): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: test.cpp:(.text+0x274): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: test.cpp:(.text+0x33d): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: test.cpp:(.text+0x355): undefined reference to `cv::Mat::~Mat()'
collect2: error: ld returned 1 exit status
$ 

更新2

现在编译时

g++ -L/usr/local/lib/libopencv_core.so -I/usr/local/include/opencv4/ test.cpp 

它抛出这个错误。/usr/local/lib中有很多opencv so文件，我是否需要包含特定的opencv so文件来编译链接中的代码

 in function `main':
test.cpp:(.text+0xb4): undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
/usr/bin/ld: test.cpp:(.text+0xde): undefined reference to `cv::Mat::empty() const'
/usr/bin/ld: test.cpp:(.text+0x154): undefined reference to `cv::Mat::Mat()'
/usr/bin/ld: test.cpp:(.text+0x1a1): undefined reference to `cv::applyColorMap(cv::_InputArray const&, cv::_OutputArray const&, int)'
/usr/bin/ld: test.cpp:(.text+0x21d): undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'
/usr/bin/ld: test.cpp:(.text+0x254): undefined reference to `cv::waitKey(int)'
/usr/bin/ld: test.cpp:(.text+0x265): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: test.cpp:(.text+0x274): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: test.cpp:(.text+0x33d): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: test.cpp:(.text+0x355): undefined reference to `cv::Mat::~Mat()'
collect2: error: ld returned 1 exit sta

Answer 1

使用-L选项，您应该指定库搜索路径。

然后使用 -l 选项指定要链接的库名称。

因此，在您的情况下，我希望看到-L/usr/local/lib -lopencv_core。请注意，-l 名称省略了 lib 前缀和文件扩展名。 (您可能需要更多 OpenCV 库。)

看到您的挣扎，我认为阅读有关编译和链接 C/C++ 程序(在您的平台上)的一般教程会很好。