Problems including jsonCpp headers

Question

I'm trying to implement the jsoncpp libraries in my C++ code, I wrote a simple piece of code just to try it out, and it's not even compiling.

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>

#ifndef json_included
#define json_included
#include "jsoncpp\include\json\json.h"
#endif

//#include "json\jsonC\json.h"
int main(int argc, char **argv)
{

std::string example = "{\"array\":[\"item1\", \"item2\"], \"not an array\":\"asdf\"}";
Json::Value value;
Json::Reader reader;

bool parsed = reader.parse(example, value, false);
std::cout << parsed;
return 0;
}

The errors i'm getting are:

undefined reference to `Json::Reader::parse(std::string const&, Json::Value&, bool)'
undefined reference to `Json::Reader::Reader()'
undefined reference to `Json::Value::~Value()'
undefined reference to `Json::Value::Value(Json::ValueType)'

I'm a bit new to C++, is there something I'm missing in the include statement? Or does jsonCpp need something extra?

Thank you for your time!

Answer 1

Your code is compiling, but it is not linking. You forgot to provide the JSON shared library files to your linker (or, on newer versions, to add the amalgamated jsoncpp.cpp to your project).

Without knowing more about your development environment, it's hard to give you more specific instructions.

BTW, you're writing C++; use C++ headers like cstdio, not stdio.h, please. You also failed to include C++ string and got lucky that it "worked" through some JSON header including it for you.