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Json sending and receiving and finding keys inside json

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  • K Offline
    K Offline
    Kris Revi
    wrote on last edited by
    #5

    i can only set QString void MainWindow::onRequestedInfoReceived(QString message) it wont allow me to set QByteArray or bytes or anything realy :S

    JonBJ 1 Reply Last reply
    0
    • K Kris Revi

      i can only set QString void MainWindow::onRequestedInfoReceived(QString message) it wont allow me to set QByteArray or bytes or anything realy :S

      JonBJ Online
      JonBJ Online
      JonB
      wrote on last edited by
      #6

      @Kris-Revi
      I assume that method is a slot, and since you don't show the signal connection I cannot comment.

      So did you try the QByteArray QString::toUtf8() const?

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      • K Offline
        K Offline
        Kris Revi
        wrote on last edited by
        #7

        @JonB
        this is the Q_SIGNAL

        void onRequestedInfoReceived(QString message);
        

        this is the Q_SLOT

        void onRequestedInfoReceived(QString message);
        
        JonBJ 1 Reply Last reply
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        • K Kris Revi

          @JonB
          this is the Q_SIGNAL

          void onRequestedInfoReceived(QString message);
          

          this is the Q_SLOT

          void onRequestedInfoReceived(QString message);
          
          JonBJ Online
          JonBJ Online
          JonB
          wrote on last edited by
          #8

          @Kris-Revi
          Fine.
          And for the third time of suggesting/asking: how are you finding using QByteArray QString::toUtf8() const on it then works for making your QString message acceptable to QJsonDocument::fromJson() with no error? I'm not going to repeat this further.

          K 2 Replies Last reply
          0
          • JonBJ JonB

            @Kris-Revi
            Fine.
            And for the third time of suggesting/asking: how are you finding using QByteArray QString::toUtf8() const on it then works for making your QString message acceptable to QJsonDocument::fromJson() with no error? I'm not going to repeat this further.

            K Offline
            K Offline
            Kris Revi
            wrote on last edited by
            #9

            @JonB wait... QByteArray QString::toUtf8() const ? :S

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            • JonBJ JonB

              @Kris-Revi
              Fine.
              And for the third time of suggesting/asking: how are you finding using QByteArray QString::toUtf8() const on it then works for making your QString message acceptable to QJsonDocument::fromJson() with no error? I'm not going to repeat this further.

              K Offline
              K Offline
              Kris Revi
              wrote on last edited by
              #10

              @JonB did this

              void MainWindow::onRequestedInfoReceived(QString message)
              {
                  //qDebug() << "[SOCKET][INFO] Requested Info : " << message;
              
                  QByteArray messageArray = message.toUtf8();
              
                  QJsonDocument doc = QJsonDocument::fromJson(messageArray);
              
                  QJsonValue test = doc.object().value("001");
              
                  qDebug() << "Board Type : " << test;
              }
              

              got

              Board Type :  QJsonValue(undefined)
              
              JonBJ 1 Reply Last reply
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              • fcarneyF Offline
                fcarneyF Offline
                fcarney
                wrote on last edited by
                #11

                What does

                qDebug().noquote() << message; 
                

                do?
                It might remove the quoting altogether and make it more readable.

                C++ is a perfectly valid school of magic.

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                • K Kris Revi

                  @JonB did this

                  void MainWindow::onRequestedInfoReceived(QString message)
                  {
                      //qDebug() << "[SOCKET][INFO] Requested Info : " << message;
                  
                      QByteArray messageArray = message.toUtf8();
                  
                      QJsonDocument doc = QJsonDocument::fromJson(messageArray);
                  
                      QJsonValue test = doc.object().value("001");
                  
                      qDebug() << "Board Type : " << test;
                  }
                  

                  got

                  Board Type :  QJsonValue(undefined)
                  
                  JonBJ Online
                  JonBJ Online
                  JonB
                  wrote on last edited by JonB
                  #12

                  @Kris-Revi
                  Print out things like QJsonDocument::isNull(), QJsonDocument::isObject(), QJsonDocument::object(). What about looking at doc.object().keys() to see what is actually in there?

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                  • K Offline
                    K Offline
                    Kris Revi
                    wrote on last edited by
                    #13

                    the printing out part is realy not an issue :) i just noticed that there was added \ in the print out and i thought that that would affect the way im searching for keys!

                    JonBJ 1 Reply Last reply
                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #14

                      Hi,

                      Side questions:

                      • Where are you getting that JSON data from ?
                      • Do you receive it directly a QString ?
                      • If not, why not change the slot signature to use a QByteArray, or even better use a const reference on a QByteArray.

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                      K 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        Hi,

                        Side questions:

                        • Where are you getting that JSON data from ?
                        • Do you receive it directly a QString ?
                        • If not, why not change the slot signature to use a QByteArray, or even better use a const reference on a QByteArray.
                        K Offline
                        K Offline
                        Kris Revi
                        wrote on last edited by
                        #15

                        @SGaist scroll to the top and you will see where i get that json from and the answer to the QString question :)

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                        • K Kris Revi

                          the printing out part is realy not an issue :) i just noticed that there was added \ in the print out and i thought that that would affect the way im searching for keys!

                          JonBJ Online
                          JonBJ Online
                          JonB
                          wrote on last edited by JonB
                          #16

                          @Kris-Revi said in Json sending and receiving and finding keys inside json:

                          the printing out part is realy not an issue :)

                          Well, yes/no, but You are wanting to get back the doc2["300"] = DeviceType/"300":"ESP32" you put in, and you say you're not succedding with doc.object().value("001"), so you need to look at what the document you have parsed back has come out like.

                          EDIT Hang on, aren't you looking for the wrong thing? When you showed the string received earlier it was:

                          [SOCKET][INFO] Requested Info :  "{\"300\":\"ESP32\",\"301\":\"Matrix Display\",\"303\":\"Matrix\"}"
                          

                          So why are you now asking for doc.object().value("001"); ? QJsonValue(undefined) looks about the right for that!

                          K 1 Reply Last reply
                          0
                          • B Offline
                            B Offline
                            Bonnie
                            wrote on last edited by
                            #17

                            I'm guessing that OP get his data from QWebSocket.
                            So if he connects QWebSocket::textMessageReceived signal, then he'll get directly a QString.

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                            • JonBJ JonB

                              @Kris-Revi said in Json sending and receiving and finding keys inside json:

                              the printing out part is realy not an issue :)

                              Well, yes/no, but You are wanting to get back the doc2["300"] = DeviceType/"300":"ESP32" you put in, and you say you're not succedding with doc.object().value("001"), so you need to look at what the document you have parsed back has come out like.

                              EDIT Hang on, aren't you looking for the wrong thing? When you showed the string received earlier it was:

                              [SOCKET][INFO] Requested Info :  "{\"300\":\"ESP32\",\"301\":\"Matrix Display\",\"303\":\"Matrix\"}"
                              

                              So why are you now asking for doc.object().value("001"); ? QJsonValue(undefined) looks about the right for that!

                              K Offline
                              K Offline
                              Kris Revi
                              wrote on last edited by
                              #18

                              @JonB you are actualy correct! xD im looking for "303" NOT the "001" that is "Request Info"

                              1 Reply Last reply
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