JSONCPP Not reading files correctly - c++

Question

So I recently installed JSONCPP and for some reason it gives me errors when I try this code:
#include <json.h>
#include <iostream>
#include <fstream>
int main(){
bool alive = true;
while (alive){
Json::Value root; // will contains the root value after parsing.
Json::Reader reader;
std::string test = "testis.json";
bool parsingSuccessful = reader.parse( test, root, false );
if ( !parsingSuccessful )
{
// report to the user the failure and their locations in the document.
std::cout << reader.getFormatedErrorMessages()
<< "\n";
}
std::string encoding = root.get("encoding", "UTF-8" ).asString();
std::cout << encoding << "\n";
alive = false;
}
return 0;
}
And here is the file:
{
"encoding" : "lab"
}
It says that there is a syntax error on Line 1, Column 1, and that there must be a value, object or array. Anyone know how to fix this?
EDIT: Changed to current code, from pastebin

Answer 1

See the Json::Reader::parse documentation. For that overload, the string needs to be the actual document, not the filename.
You can use the istream overload with a ifstream instead.
std::ifstream test("testis.json", std::ifstream::binary);
EDIT: I got it work with:
#include "json/json.h"
#include <iostream>
#include <fstream>
int main(){
bool alive = true;
while (alive){
Json::Value root; // will contains the root value after parsing.
Json::Reader reader;
std::ifstream test("testis.json", std::ifstream::binary);
bool parsingSuccessful = reader.parse( test, root, false );
if ( !parsingSuccessful )
{
// report to the user the failure and their locations in the document.
std::cout << reader.getFormatedErrorMessages()
<< "\n";
}
std::string encoding = root.get("encoding", "UTF-8" ).asString();
std::cout << encoding << "\n";
alive = false;
}
return 0;
}

Answer 2

#include "json/json.h"
#include <iostream>
#include <fstream>
int main(){
Json::Value root; // will contain the root value after parsing.
std::ifstream stream("testis.json", std::ifstream::binary);
stream >> root;
std::string encoding = root.get("encoding", "UTF-8" ).asString();
std::cout << encoding << "\n";
return 0;
}
Or more generally:
#include "json/json.h"
#include <iostream>
#include <fstream>
int main(){
Json::Value root; // will contain the root value after parsing.
Json::CharReaderBuilder builder;
std::ifstream test("testis.json", std::ifstream::binary);
std::string errs;
bool ok = Json::parseFromStream(builder, test, &root, &errs);
if ( !ok )
{
// report to the user the failure and their locations in the document.
std::cout << errs << "\n";
}
std::string encoding = root.get("encoding", "UTF-8" ).asString();
std::cout << encoding << "\n";
return 0;
}
http://open-source-parsers.github.io/jsoncpp-docs/doxygen/namespace_json.html

Answer 3

json cannot contain newlines. Try this instead:
{"encoding": "lab"}
You may need to ensure the file is saved without a final newline.
EDIT: Maybe your parser tolerates newlines, but some don't. Something to try if the other answers don't work