JSON封装数据和解析数据（2）

封装json数据为string

方法1：

std::string DataToJson()
{
    Json::FastWriter writerinfo;
    Json::Value  writevalueinfo;
    writevalueinfo["id"]=abc123;   
    writevalueinfo["time"]="2020.04.26 00:00:00";

    Json::Value  writedata;
    writedata["count"] = 1;
    writedata["name"] = "cpp";

    writevalueinfo["data"]=writedata;

    std::string strEmail = writerinfo.write(writevalueinfo);
    return strEmail;
}
示例json://公众号：C与C语言plus
{
    "data": {
        "count": 1,
        "name": "cpp"
    },
    "id": abc123,
    "time": "2020.04.26 00:00:00"
}

      

方法2（直接拼接）：

CString strTempData；
msg_content =  ” 1号设备水位超过阈值报警”;
cstrsha256 =  “20823c7cf53e97898f39f212b9dbee960220b3fa272c884c62f1f3fe6af56f38”;
strmobile =  “ 13004091102”;
strtime =  “1587711951 ”;
strTempData.Format("{\"tpl_id\": %ld,\"params\":\[ \"%s\"\],\"playtimes\": %d,\"sig\": \"%s\",
\"tel\":\{\"mobile\":\"%s\",\"nationcode\":\"%d\"\},\"time\": %ld, \"ext\":\"\"\}",568369,
msg_content,2,cstrsha256,strmobile,86,strtime);

示例json:  //公众号：C与C语言plus
{
  "tpl_id": 568369,
  "params": ["1号设备水位超过阈值报警 "],
  "playtimes": 2,
  "sig": "20823c7cf53e97898f39f212b9dbee960220b3fa272c884c62f1f3fe6af56f38",
  "tel": {
    "mobile": "13004091102",
    "nationcode": "86"
  },
  "time": 1587711951,
  "ext": ""
}

      

解析json数据

void TranslateJson(const string strData)
{
    // 解析json用Json::Reader
    Json::Reader *readerinfo = new Json::Reader(Json::Features::strictMode());
    // Json::Value是一种很重要的类型，可以代表任意类型。如int, string, object, array...
    Json::Value root;       
    if (readerinfo->parse(strData, root))
    {
        if (root["id"].isInt())
        {
            int nID = root["id"].asInt();
        }
        if (root["time"].isString())
        {
            std::string strTime = root["time"].asString();
        }
        if (root["data"]["count"].isInt())
        {
            int nDataCount = root["data"]["count"].asInt();
        }

        if (root["data"]["name"].isString())
        {
            std::string strDataName = root["data"]["name"].asString();
        }

    }
    ::delete readerinfo;
    readerinfo = NULL;
}