我用stm32mp1做了个疫情监控平台3—疫情监控平台实现 -九游会网页

//打开保存的json数据文件，并调用解析函数
void dialog::parsedata(qstring filename)
{
    qfile file(filename);
    if(!file.open(qiodevice::readonly))
    {
        qdebug() << "file open failed";
        return;
    }
    qbytearray alldata = file.readall();
    file.close();
// qdebug() << alldata;
    getdata(alldata);
    file.remove();            //删除文件
    return;
}
//把数据解析出来并显示在标签上
void dialog::getdata(qbytearray str)
{
    cjson *ret_obj;
    cjson *root_obj;
    root_obj = cjson_parse(str);   //创建json解析对象，返回json格式是否正确
    if (!root_obj)
    {
        disinfo("json format error");
        qdebug() << "json format error";
    }
    else
    {
        disinfo("json format ok");
        qdebug() << "json format ok";
        ret_obj = cjson_getobjectitem(root_obj, "ret");
        if(cjson_isnumber(ret_obj))
        {
            int ret = 1;
            ret = ret_obj->valueint;
// qdebug() << ret_obj->valueint;
        }
        char *data_str = cjson_getobjectitem(root_obj, "data")->valuestring;
        cjson *data_obj = cjson_parse(data_str);
        if(!data_obj)
        {
            qdebug() << "data json err";
            cnt_error  ;
            qstring error = "err:"   qstring::number(cnt_error);
            ui->lbe_error->settext(error);
        }
        else
        {
            qdebug() << "data json ok";
            char *lastupdatetime = cjson_getobjectitem(data_obj, "lastupdatetime")->valuestring;
            qdebug() << lastupdatetime;
            ui->lbe_update_time->settext(lastupdatetime);
            cjson *chinatotal_obj = cjson_getobjectitem(data_obj, "chinatotal");
            int chinatotal_confirm    = cjson_getobjectitem(chinatotal_obj, "confirm")->valueint;
            int chinatotal_heal       = cjson_getobjectitem(chinatotal_obj, "heal")->valueint;
            int chinatotal_dead       = cjson_getobjectitem(chinatotal_obj, "dead")->valueint;
            int chinatotal_nowconfirm = cjson_getobjectitem(chinatotal_obj, "nowconfirm")->valueint;
            int chinatotal_suspect    = cjson_getobjectitem(chinatotal_obj, "suspect")->valueint;
            int chinatotal_nowsevere  = cjson_getobjectitem(chinatotal_obj, "nowsevere")->valueint;
            ui->lbe_total_confirm->setnum(chinatotal_confirm);
            ui->lbe_total_heal->setnum(chinatotal_heal);
            ui->lbe_total_dead->setnum(chinatotal_dead);
            ui->lbe_total_nowconfirm->setnum(chinatotal_nowconfirm);
            ui->lbe_total_suspect->setnum(chinatotal_suspect);
            ui->lbe_total_nowsevere->setnum(chinatotal_nowsevere);
            cjson *chinaadd_obj = cjson_getobjectitem(data_obj, "chinaadd");
            int chinaadd_confirm    = cjson_getobjectitem(chinaadd_obj, "confirm")->valueint;
            int chinaadd_heal       = cjson_getobjectitem(chinaadd_obj, "heal")->valueint;
            int chinaadd_dead       = cjson_getobjectitem(chinaadd_obj, "dead")->valueint;
            int chinaadd_nowconfirm = cjson_getobjectitem(chinaadd_obj, "nowconfirm")->valueint;
            int chinaadd_suspect    = cjson_getobjectitem(chinaadd_obj, "suspect")->valueint;
            int chinaadd_nowsevere  = cjson_getobjectitem(chinaadd_obj, "nowsevere")->valueint;
            lbedisplay(ui->lbe_add_confirm, chinaadd_confirm);
            lbedisplay(ui->lbe_add_heal, chinaadd_heal);
            lbedisplay(ui->lbe_add_dead, chinaadd_dead);
            lbedisplay(ui->lbe_add_nowconfirm, chinaadd_nowconfirm);
            lbedisplay(ui->lbe_add_suspect, chinaadd_suspect);
            lbedisplay(ui->lbe_add_nowsevere, chinaadd_nowsevere);
        }
// cjson_delete(ret_obj);
// cjson_delete(data_obj);
        cjson_delete(root_obj);//释放内存
        disinfo("更新完成");
        cnt_success  ;
        qstring success = "ok:"   qstring::number(cnt_success);
        ui->lbe_success->settext(success);
    }
}
//数据的显示
void dialog::lbedisplay(qlabel *lbe, int num)
{
    if(num > 0)
        lbe->settext(" "   qstring::number(num));
    else
        lbe->settext(qstring::number(num));
} 

//forexample:192.168.1.111
qstring dialog::getlocalmachineip()
{
    qstring ipaddress;
    qlist ipaddresseslist = qnetworkinterface::alladdresses();
    for(qhostaddress &addr : ipaddresseslist)
    {
        // 找到不是本地ip，并且是ipv4协议，并且不是169开头的第一个地址
        if(addr != qhostaddress::localhost && addr.protocol() == qabstractsocket::ipv4protocol && !addr.tostring().startswith("169"))
        {
            ipaddress = addr.tostring();
            break;
        }
    }
    // if we did not find one, use ipv4 localhost
    if (ipaddress.isempty())
        ipaddress = qhostaddress(qhostaddress::localhost).tostring();
    return ipaddress;
}