Setting up cmake with C++ and openCV: fatal error: opencv2/opencv.hpp: No such file or directory #include <opencv2/opencv.hpp>

Question

I am very new to C++ and cmake (that means: I started yesterday) and I am stuck trying to include OpenCV. It might be a complete rookie mistake that I made somewhere during installation as well, so I am really hoping for your ideas and experience. So, this is the code I am trying to run:

#include <opencv2/opencv.hpp>
#include <iostream>

int main(){
    std::cout << CV_VERSION << std::endl;
    return 0;
}

This is the error message I am getting:

main.cpp:1:30: fatal error: opencv2/opencv.hpp: No such file or directory
 #include <opencv2/opencv.hpp>

I had a look at this post here and updated my CMake file to this:

cmake_minimum_required(VERSION 3.0.0)
project(myproject VERSION 0.1.0 LANGUAGES C CXX)

set(CMAKE_CXX_STANDARD 17)

include(CTest)
enable_testing()

find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
message("OpenCV_INCLUDE_DIRS: ${OpenCV_INCLUDE_DIRS}")

add_executable(myproject main.cpp)

target_link_libraries(myproject ${OpenCV_LIBS} )

set(CPACK_PROJECT_NAME ${PROJECT_NAME})
set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
include(CPack)

UPDATE: Meanwhile, I added a couple of json files, as suggested here.But I am not exactely sure if I adjusted them correctly to my case.

So this is my c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "C:/opencv/sources/include",
                "C:/opencv/build/include"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.19041.0",
            "compilerPath": "C:/msys64/mingw64/bin/g++.exe",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "windows-msvc-x64",
            "configurationProvider": "ms-vscode.cmake-tools"
        }
    ],
    "version": 4
}

But that didn't solve the problem either. Any ideas on what is wrong? As I said, I am completely new to this so it might be something really easy/stupid. ^^°

Those are the locations on my PC where Cmake and openCV are stored, in case that is relevant :

C:\opencv
C:\Program Files\CMake

Check the value of OpenCV_INCLUDE_DIRS and make sure it points to where you expect and that it contains opencv2/opencv.hpp — Alan Birtles
– Alan Birtles, Commented Jun 22, 2023 at 15:38
@AlanBirtles Thanks for that. I checked and I found two things: OpenCV_INCLUDE_DIRS = C:/opencv/build/include which seems to be fine, because there is this file C:\opencv\build\include\opencv2\opencv.hpp BUT there is also a file with the same name here: C:\opencv\sources\include\opencv2\opencv.hpp and now I am confused which one I need and how to link it properly... — Crazy Engineer
– Crazy Engineer, Commented Jun 23, 2023 at 6:34
the next thing to check is what the compiler commands actually are, if you're using make you can run make VERBOSE=1 — Alan Birtles
– Alan Birtles, Commented Jun 23, 2023 at 7:13
c_cpp_properties.json only configures intellisense, it won't fix compiler errors — Alan Birtles
– Alan Birtles, Commented Jun 26, 2023 at 8:27

Crazy Engineer · Accepted Answer · 2023-06-26 13:56:06Z

Ok, meanwhile I found a way to make it work. I originally followed this tutorial to set everything up. But upon running the script using the “play button” I encountered the error mentioned in the title and the description, even though the files were in the indicated location and all paths were correctly included. And I still cannot do it this way but there is another way and maybe there are more beginners like me who are not aware of this, which is why I want to share it.

In Windows, press SHIFT+CRTL+P and type in “CMake” in the window that pops up and you will find the CMake: Build command. Click it and it will generate an executable file for you, which in my case was located in build/Debug/. If you run this executable from the console, it works (provided your code doesn’t contain any errors).

It is kind of a workaround, because at least according to the mentioned tutorial there should be a simpler way to run the code, but at least I can continue working now.

It would still be interesting to know why it doesn’t find the files when I run the script directly in VSCode, so if anyone has an idea, please share it, it will help me and others that are struggling with the same (beginner?) problems.

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