Build error in JSONCPP (Visual Studio2010)

Question

I downloaded JSONCPP from GitHub. I included header file Json.h and wrote simple code as shown in picture. But i am getting link errors. Can you please help in using JSONCPP.

lINK ERROR: unresolved external symbol "public: __thiscall Json::Reader::Reader(void)" (??0Reader@Json@@QAE@XZ) referenced in function "void __cdecl `dynamic initializer for 'read''(void)" (??__Eread@@YAXXZ)[![MY code][1]][1]

#include "stdafx.h"
#include <json.h>

Json::Reader read;

int _tmain(int argc, _TCHAR* argv[])
{
    return 0;
}

It is better to post code here, not images of code. This helps us help you quicker. — Karl Gjertsen, Apr 12 '16 at 10:28
Possible duplicate of [What is an undefined reference/unresolved external symbol error and how do I fix it?](http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix) — Biffen, Apr 12 '16 at 10:58

Ari0nhh · Answer 1 · 2016-04-12T11:02:15.130

0

You are getting linker errors because json.h file contains only class and method definitions and no actual implementation. To resolve this problem you have to generate amalgamated source from the JsonCpp and include its files into your project. See Readme.md file in the project root for the additional info.

sonCpp is provided with a script to generate a single header and a single source file to ease inclusion into an existing project. The amalgamated source can be generated at any time by running the following command from the top-directory (this requires Python 2.6):

python amalgamate.py

Another option would be compiling JSONCPP source to the .lib file and use its with your project.

edited Apr 12 '16 at 11:02

answered Apr 12 '16 at 10:55

Ari0nhh

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I did not find JSON.cpp file in entire directory :( – user2329702 Apr 12 '16 at 12:13
It will be created when you run `amalgamate.py` script. – Ari0nhh Apr 12 '16 at 12:14
I built lib_json.lib by using VS solution ( provided with JSONCPP) which is in msvc2010 folder. Can we use this lib ? – user2329702 Apr 12 '16 at 12:17
@user2329702 Sure. Simply add reference to in in you project options. – Ari0nhh Apr 12 '16 at 12:24
Check that runtime settings for your project and `JSONCpp` library are the same. See project Options->c/c++->Code Generation->Runtime – Ari0nhh Apr 12 '16 at 12:29

Build error in JSONCPP (Visual Studio2010)

1 Answers1