error C4996: ‘Json::Reader::Char’: Use CharReader and CharReaderBuilder instead

Posted 2020-10-16 ~小小鸟~

1、编译下面代码时，遇到标题中的错误

const char* str = "{\"name\":\"xiaoming\",\"age\":18}";  
    Json::Value root;  
    Json::Reader reader;  
    if (!reader.parse(str, root))  
    {  
        cout << "Parse from str failed\n";  
        return;  
    }  
      
    string name = root["name"].asCString();  
    int age = root["age"].asInt();  
    std::cout << "name: " << name << "  age:" << age;  

2、解决方法，根据提示修改代码，如下：

    Json::CharReaderBuilder b;
    Json::CharReader* reader(b.newCharReader());
    Json::Value root;
    JSONCPP_STRING errs;
    bool ok = reader->parse(str, str + std::strlen(str), &root, &errs);
    if (ok&&errs.size() == 0)
    {
        std::string upload_id = root["uploadid"].asString();  // 访问节点，upload_id = "UP000000"  
        int code = root["code"].asInt();    // 访问节点，code = 100  
    }
    delete reader;