Undefined reference Json::Value and Json::Reader

Question

When I run the following code:

#include <cstdio>
#include <iostream>
#include <fstream>
#include <cstring>
#include <C:\Users\User\Documents\jsoncpp-master\dist\json\json.h>
#include <C:\Users\User\Documents\jsoncpp-master\dist\json\json-forwards.h>

using namespace std;

int main(){
    Json::Value root;
    Json::Reader reader;

    ifstream file("test.json");

   return 0;
}

I get the following errors:

undefined reference to `Json::Reader::Reader()'
undefined reference to `Json::Value::Value(Json::ValueType)'

I am trying to write a program to read the JSON file and this code also has to output the data in the JSON file to be used by another C++ module.

UPDATE

#include <cstdio>
#include <iostream>
#include <fstream>
#include <cstring>
#include "dist\jsoncpp.cpp"
using namespace std;

int main(){

    Json::Value root;
    Json::Reader reader;

    ifstream file("test.json");

    return 0;
}

I have the changed the code to remove the full link and inserted the dist folder I got after I ran:

python amalgamate.py

And I entered the header files into C:\MinGW\include

I am now getting a lot of errors in the jsoncpp.cpp file (this is the file I got after running the python command and I did not change it at all). All the errors say the same message, which is:

first defined here

[OT]: Don't use full path for include. Specify to your build system additional directories to find headers. — Jarod42, Aug 19 '16 at 09:40
Try the following solution: http://stackoverflow.com/questions/5174019/problems-including-jsoncpp-headers — Fr333du, Aug 19 '16 at 09:41
How did you build your project? How did you link JsonCpp? Did you RTFM about how to use JsonCpp? (Seems not) — Lightness Races in Orbit, Aug 19 '16 at 09:55

score 2 · Answer 1 · answered Aug 19 '16 at 09:39

It's not enough to just include h files to your source code. You need to compile jsoncpp.cpp in your project. Please follow https://github.com/open-source-parsers/jsoncpp#generating-amalgamated-source-and-header and add jsoncpp.cpp, json/json.h, json/forwards.h to your project.

Undefined reference Json::Value and Json::Reader

1 Answers1

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