windows include path doesn't work (compiling issue)

[sirus20x6]

c_cpp_properties.json

{
    "env": {
      "myDefaultIncludePath": ["${workspaceFolder}", "${workspaceFolder}/include", "c:/opencv/sources/modules/core/include/**"],
      "myCompilerPath": "C:/Program Files (x86)/mingw-w64/i686-8.1.0-posix-dwarf-rt_v6-rev0/mingw32/bin/g++.exe"
    },
    "configurations": [
      {
        "name": "Win32",
        "intelliSenseMode": "clang-x64",
        "includePath": ["${workspaceFolder}/**", "c:/opencv/sources/modules/core/include/**"],
        "forcedInclude": ["${workspaceFolder}/**"],
        "compilerPath": "C:/Program Files (x86)/mingw-w64/i686-8.1.0-posix-dwarf-rt_v6-rev0/mingw32/bin/g++.exe",
        "cStandard": "c11",
        "cppStandard": "c++17",
        "compileCommands": "/path/to/compile_commands.json",
        "browse": {
          "path": ["${workspaceFolder}", "c:/opencv/sources/modules/core/include/**"],
          "limitSymbolsToIncludedHeaders": true,
          "databaseFilename": ""
        }
      }
    ],
    "version": 4
  }

main.cpp

#include <iostream>
#include "c:/opencv/sources/modules/core/include/opencv2/core/core.hpp"
#include "c:/opencv/sources/modules/core/include/opencv2/highgui/highgui.hpp"

//opencv2/core/core.hpp
using namespace cv;
using namespace std;
int main()
{
    Mat img;
    img-imread("D:/seedsorter/IMG_20200505_185950.jpg");
    if(! img.data)
    {
        cout << "image not found" << endl;
    }
    namedWindow("robotW");
    imshow("robotW", img);
    waitKey(0);
    return 0;
}

when trying to compile

`> Executing task: & 'C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe' -g c:\code\opencvtest\main.cpp -o c:\code\opencvtest\main.exe <

c:\code\opencvtest\main.cpp:2:10: fatal error: opencv2/core/core.hpp: No such file or directory

include <opencv2/core/core.hpp>

      ^~~~~~~~~~~~~~~~~~~~~~~

compilation terminated. The terminal process terminated with exit code: 1

Terminal will be reused by tasks, press any key to close it.

Executing task: & 'C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe' -g c:\code\opencvtest\main.cpp -o c:\code\opencvtest\main.exe <

c:\code\opencvtest\main.cpp:2:10: fatal error: opencv2/core/core.hpp: No such file or directory

include <opencv2/core/core.hpp>

      ^~~~~~~~~~~~~~~~~~~~~~~

compilation terminated. The terminal process terminated with exit code: 1

Terminal will be reused by tasks, press any key to close it.

Executing task: & 'C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe' -g c:\code\opencvtest\main.cpp -o c:\code\opencvtest\main.exe <

c:\code\opencvtest\main.cpp:2:10: fatal error: opencv2/core/core.hpp: No such file or directory

include "opencv2/core/core.hpp"

      ^~~~~~~~~~~~~~~~~~~~~~~

compilation terminated. The terminal process terminated with exit code: 1

Terminal will be reused by tasks, press any key to close it.

Executing task: & 'C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe' -g c:\code\opencvtest\main.cpp -o c:\code\opencvtest\main.exe <

In file included from c:\code\opencvtest\main.cpp:2: c:/opencv/sources/modules/core/include/opencv2/core/core.hpp:48:10: fatal error: opencv2/core.hpp: No such file or directory

include "opencv2/core.hpp"

      ^~~~~~~~~~~~~~~~~~

compilation terminated. The terminal process terminated with exit code: 1

Terminal will be reused by tasks, press any key to close it.`

[michelleangela]

The c_cpp_properties.json file is used to configure the C/C++ extension IntelliSense features and is not used for compiling. For clarification, the C/C++ extension does not provide compiling capabilities.

If you are using the VS Code tasks.json file to compile, then you'll need to add the include paths using the -I include compiler option to the "args" property in the tasks.json file. For example, see tutorial https://code.visualstudio.com/docs/cpp/config-mingw#_build-helloworldcpp

[sirus20x6]

I ctrl+f that page for -I which did not appear. This is my tasks.json file

{
    "version": "2.0.0",
    "tasks": [
        {
            "type": "shell",
            "label": "g++",
            "command": "C:\\mingw-w64\\i686-8.1.0-posix-dwarf-rt_v6-rev0\\mingw32\\bin\\g++.exe",
            "args": [
                "-g",
                "${file}",
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe",
                "-I c:/opencv/sources/modules/core/include/**"
            ],
            "options": {
                "cwd": "C:\\mingw-w64\\i686-8.1.0-posix-dwarf-rt_v6-rev0\\mingw32\\bin"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        },
        {
            "type": "shell",
            "label": "C/C++: cpp.exe build active file",
            "command": "C:\\Program Files (x86)\\mingw-w64\\i686-8.1.0-posix-dwarf-rt_v6-rev0\\mingw32\\bin\\cpp.exe",
            "args": [
                "-g",
                "${file}",
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe",
                "-I c:/opencv/sources/modules/core/include/**"
            ],
            "options": {
                "cwd": "C:\\Program Files (x86)\\mingw-w64\\i686-8.1.0-posix-dwarf-rt_v6-rev0\\mingw32\\bin"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": "build"
        },
        {
            "type": "shell",
            "label": "g++.exe build active file",
            "command": "C:\\Program Files (x86)\\mingw-w64\\i686-8.1.0-posix-dwarf-rt_v6-rev0\\mingw32\\bin\\g++.exe",
            "args": [
                "-g",
                "${file}",
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe",
                "-I c:/opencv/sources/modules/core/include/**"
            ],
            "options": {
                "cwd": "C:\\Program Files (x86)\\mingw-w64\\i686-8.1.0-posix-dwarf-rt_v6-rev0\\mingw32\\bin"
            }
        }
    ]
}

[michelleangela]

Sorry for confusion, I referred to https://code.visualstudio.com/docs/cpp/config-mingw#_build-helloworldcpp as example to show tasks.json.

As for adding include path option to the compiler args property, I think the include path may need to be in a separate entry in the array, similar to how the output file is specified by "-o" and then the output file name is in the next entry in the array. Also, I don't know if ** for recursive includes is a feature that tasks.json knows.

So the args may look something like:

"args": [
                "-g",
                "${file}",
                "-I",
                "c:\\opencv\\sources\\modules\\core\\include"
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe",
           ]

[sirus20x6]

no change. still the same

[sean-mcmanus]

Are you able to compile via the command line without using VS Code? Are you sure c:\\opencv\\sources\\modules\\core\\include is the correct include path?

[sirus20x6]

terminal

> Executing task: & 'C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe' -g c:\code\opencvtest\main.cpp -I c:/opencv/sources/modules/core/include/ -o c:\code\opencvtest\main.exe <

In file included from c:/opencv/sources/modules/core/include/opencv2/core.hpp:54,
                 from c:/opencv/sources/modules/core/include/opencv2/core/core.hpp:48,
                 from c:\code\opencvtest\main.cpp:2:
c:/opencv/sources/modules/core/include/opencv2/core/base.hpp:52:10: fatal error: opencv2/opencv_modules.hpp: No such file or directory
 #include "opencv2/opencv_modules.hpp"
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
The terminal process terminated with exit code: 1

Terminal will be reused by tasks, press any key to close it.

screenshot of the files I'm trying to include https://i.imgur.com/si9eFh3.png

[sirus20x6]

I guess it was supposed to be C:\opencv\build\include instead of .../sources/

my next issue is slightly different

> Executing task: & 'C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe' -g c:\code\opencvtest\main.cpp -I C:\opencv\build\include -o c:\code\opencvtest\main.exe <

C:\Users\sirus\AppData\Local\Temp\ccB9qgVX.o: In function `main':
c:/code/opencvtest/main.cpp:10: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
c:/code/opencvtest/main.cpp:10: undefined reference to `cv::operator-(cv::Mat const&, cv::Mat const&)'
c:/code/opencvtest/main.cpp:15: undefined reference to `cv::namedWindow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
c:/code/opencvtest/main.cpp:16: undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray
const&)'
c:/code/opencvtest/main.cpp:17: undefined reference to `cv::waitKey(int)'
C:\Users\sirus\AppData\Local\Temp\ccB9qgVX.o: In function `ZN2cv3MatD1Ev':
C:/opencv/build/include/opencv2/core/mat.inl.hpp:754: undefined reference to `cv::fastFree(void*)'
C:\Users\sirus\AppData\Local\Temp\ccB9qgVX.o: In function `ZN2cv3Mat7releaseEv':
C:/opencv/build/include/opencv2/core/mat.inl.hpp:866: undefined reference to `cv::Mat::deallocate()'
collect2.exe: error: ld returned 1 exit status
The terminal process terminated with exit code: 1

Terminal will be reused by tasks, press any key to close it.

[sean-mcmanus]

I'm not familiar with how to build OpenCV, but it sounds like you need to link to your OpenCV's libraries. I would refer to the OpenCV documentation and https://www.cs.swarthmore.edu/~newhall/unixhelp/howto_C_libraries.html .

[sirus20x6]

Yes there were some differences between windows and linux that I was not aware of. I'm booted back in linux and can link, and build fine now.