JSON-CPP-如何从字符串初始化并获取字符串值? [英] Json-cpp - how to initialize from string and get string value?

问题描述

我下面的代码崩溃(调试错误！已调用R6010 abort()).你能帮助我吗?我也想知道如何从字符串值初始化json对象.

My code below crashes(Debug Error! R6010 abort() has been called). Can you help me? I'd also would like to know how to initialize the json object from a string value.

Json::Value obj;
obj["test"] = 5;
obj["testsd"] = 655;
string c = obj.asString();

推荐答案

您好，这很简单:

1-您需要一个CPP JSON值对象(Json :: Value)来存储数据

1 - You need a CPP JSON value object (Json::Value) to store your data

2-使用Json Reader(Json :: Reader)读取JSON字符串并解析为JSON对象

2 - Use a Json Reader (Json::Reader) to read a JSON String and parse into a JSON Object

3-做你的事情:)

以下是执行这些步骤的简单代码:

Here is a simple code to make those steps:

#include <stdio.h>
#include <jsoncpp/json/json.h>
#include <jsoncpp/json/reader.h>
#include <jsoncpp/json/writer.h>
#include <jsoncpp/json/value.h>
#include <string>

int main( int argc, const char* argv[] )
{

    std::string strJson = "{\"mykey\" : \"myvalue\"}"; // need escape the quotes

    Json::Value root;   
    Json::Reader reader;
    bool parsingSuccessful = reader.parse( strJson.c_str(), root );     //parse process
    if ( !parsingSuccessful )
    {
        std::cout  << "Failed to parse"
               << reader.getFormattedErrorMessages();
        return 0;
    }
    std::cout << root.get("mykey", "A Default Value if not exists" ).asString() << std::endl;
    return 0;
}

要编译:g ++ YourMainFile.cpp -o main -l jsoncpp

To compile: g++ YourMainFile.cpp -o main -l jsoncpp

我希望它会有所帮助;)

I hope it helps ;)

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