Linux Visual Studio Code C++ File Not Found - c++

Question

New to visual studio code. I've setup a basic opencv project and am trying to get it to compile. I've setup my include path in the c_cpp_properties.json and get auto-completion correctly. However, when I go to compile g++ says it doesn't know of the included directory. What is the best way to fix this issue? My assumption is I need to also pass it to the tasks.json, but i'm unsure of a good way to do that for include directories.
c_cpp_properties.json
{
"configurations": [
{
"name": "Linux",
"includePath": [
"${workspaceFolder}/**",
"/usr/local/include/opencv4"
],
"defines": ["_DEBUG"],
"compilerPath": "/usr/bin/g++",
"cStandard": "c11",
"cppStandard": "c++17",
"intelliSenseMode": "clang-x64"
}
],
"version": 4
}
tasks.json
{
"version": "2.0.0",
"tasks": [
{
"label": "build hello world",
"type": "shell",
"command": "g++",
"args": [
"-g", "main.cpp"
],
"group": {
"kind": "build",
"isDefault": true
}
}
]
}
launch.json
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "(gdb) Launch",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/a.out",
"args": [],
"stopAtEntry": false,
"cwd": "${workspaceFolder}",
"environment": [],
"externalConsole": true,
"MIMode": "gdb",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
}
],
"preLaunchTask": "build hello world"
}
]
}
Basic code to show an image
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, const char** argv)
{
Mat image;
image = imread("./images/test.jpg");
if(!image.data)
{
std::cout << "No image data" << std::endl;
return -1;
}
namedWindow("Display Image",WINDOW_AUTOSIZE);
imshow("Display Image", image);
waitKey(0);
return 0;
}
Error
> Executing task: g++ -g main.cpp <
main.cpp:2:10: fatal error: opencv2/opencv.hpp: No such file or directory
#include <opencv2/opencv.hpp>
^~~~~~~~~~~~~~~~~~~~
compilation terminated.
The terminal process terminated with exit code: 1
Terminal will be reused by tasks, press any key to close it.

Answer 1

c_cpp_properties.json is the config for IntelliSense only. You have to configure required compiler arguments (include dirs) in tasks.json separately.
tasks.json
{
"version": "2.0.0",
"tasks": [
{
"label": "build hello world",
"type": "shell",
"command": "g++",
"args": [
"-I/usr/local/include/opencv4",
"-g",
"main.cpp"
],
"group": {
"kind": "build",
"isDefault": true
}
}
]
}