c++ - JSONCPP 没有正确读取文件

Question

所以我最近安装了 JSONCPP，出于某种原因，当我尝试这段代码时它给了我错误:

#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;
}

这是文件:

{
"encoding" : "lab"
}

它说第 1 行第 1 列有一个语法错误，必须有一个值、对象或数组。有人知道如何解决这个问题吗？

编辑:更改为当前代码，来自 pastebin

Answer 1

参见 Json::Reader::parse文档。对于该重载，字符串需要是实际文档，而不是文件名。

您可以使用 istream overload用 ifstream 代替。

std::ifstream test("testis.json", std::ifstream::binary);

编辑:我得到它的工作:

#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;
}