字符串写入到json文件

    int write_notice_to_json(string str_path, const string& str_content)
    {  
        Json::Reader reader;
        Json::FastWriter writer;
        Json::Value root;
        if (false == reader.parse(str_content, root))  // reader将Json字符串解析到root，root将包含Json里所有子元素
        {
            return  RESULT_ERROR; 
        } 

        std::string json_file = writer.write(root);
        ofstream ofs;
        ofs.open(str_path.c_str(), ofstream::out);
        if (ofs.is_open())
        {
            ofs << json_file;
            ofs.close(); 
            return  RESULT_OK;
        } 
        return  RESULT_ERROR;
    }