c++ json cpp 解析

const char* str = "{\"jsonrpc\": \"2.0\",\"method\": \"find\",\"params\": [\"1 \"]}";
        auto readerBuilder = Json::CharReaderBuilder();
        auto sreader = readerBuilder.newCharReader();
        Json::Value root;
        std::string errotStr;
        if (sreader->parse(str, str + strlen(str), &root, &errotStr))
        {
            std::string version = root["jsonrpc"].asString();
        }