json文件读取与写入

bool ret = false;
hudVersionInfo hudVersionData;
std::string file = “/emmc/svp/tpa/hud_Desay/hud_12x4/data/hudVersion.json”;
std::ifstream inputFile(file);
std::string json_str, line;

uint8_t write[20] = { 0x55, 0xaa };
uint8_t readType[5] = { 0x55, 0xaa };
uint8_t read[20] = { 0x0 };

if (inputFile.is_open()) 
{
    while (getline(inputFile, line))
    {
        json_str = json_str + line;
    }
}else
{
    adapter_info("error, file %s is not open", file.c_str());
}
nlohmann::json j = nlohmann::json::parse(json_str);
hudVersionData.ver = j["version"];
hudVersionData.md5 = j["md5"];
std::string tmpStr = j["force_update"];
hudVersionData.forceUpdate = std::stoi(tmpStr);
this->_forceUpdateFlg = hudVersionData.forceUpdate;
adapter_info("version: %s, md5: %s, force_update: %u\n", hudVersionData.ver.c_str(), hudVersionData.md5.c_str(), hudVersionData.forceUpdate);

if(this->_forceUpdateFlg == true)
{
    j["force_update"] = "0";
    std::string json_outStr = j.dump(4);
    // printf("%s\n", json_outStr.c_str());

    std::ofstream outfile(file);
    if (!outfile.is_open()) { // 检查文件是否成功打开
        adapter_info("无法打开文件%s", file.c_str());
        return 1;
    }
    outfile << json_outStr; //写入文件
    outfile.close(); 
}
else
{
    //查询版本号todo
    std::string queryHudVersion = "33.22.11"; //mock版本号
    //hudVersionData.ver
    int result = version_compare(hudVersionData.ver.c_str(), queryHudVersion.c_str());
    if (result > 0)
    {
        adapter_error("%s is newer than %s\n", v1, v2);
        //可以升级
    }
    {
        ret = false;//不升级
    }

}

if (access(“hud.bin”, F_OK) == 0)
{
std::string filename = “hud.bin”;
std::string md5Result;
if(get_file_md5(filename, md5Result) != 0)
{
ret = false;
}

    if (md5Result != hudVersionData.md5)//版本md5不一致
    {
        ret = false;
    }

}
else//文件不存在
{
ret = false;
}
return true;