Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

"QEventLoop::exec: instance 0xbfd551e4 has already called exec()" Problem



  • I have three class , json package parser, serialport controller and tcp sender.While I was sending serial package suddenly json package comes and parsed but in serial sender side gives this error:

    "QEventLoop::exec: instance 0xbfd551e4 has already called exec()"

    and code crashes.How can I solve this problem?
    Output is like that:

    @

    "7E 7E 12 01 02 10 10 50 AA AA "
    "http://1.11.31.10:28017/iybs_status/timetable/?filte_stationid=999"
    RFID Init Stater

    "02 00 08 00 52 00 B9 05 " --> Serial Packet
    // ---json parsing ---
    Reply = "{
    "offset" : 0,
    "rows": [
    {/JSON/ } }
    ],

    "total_rows" : 1 ,
    "query" : {} ,
    "millis" : 0
    }
    "
    JSON Parsed
    // --- JSON Finished ---
    Event loop calisiomus--> RFIDCSFourLineStater

    "7E 7E 12 01 02 10 10 50 AA AA " --> An other serial packet
    QEventLoop::exec: instance 0xbfd551e4 has already called exec()

    "7E 7E 12 01 02 04 00 68 AA AA "
    QEventLoop::exec: instance 0xbfd551e4 has already called exec()

    @


  • Lifetime Qt Champion

    Hi,

    Without seeing any part of your code, it's crystal ball debugging. Please show us the related classes


Log in to reply