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How to append the serial read data on to the QPlaintext on qt gui window

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  • V veera

    @VRonin

    i got this
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    VRoninV Offline
    VRoninV Offline
    VRonin
    wrote on last edited by
    #8

    What does qDebug()<<"Response: "<<serialData; print?

    "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
    ~Napoleon Bonaparte

    On a crusade to banish setIndexWidget() from the holy land of Qt

    1 Reply Last reply
    1
    • V Offline
      V Offline
      veera
      wrote on last edited by
      #9

      yes its writing on plaintext window.......

      qDebug()<<"Response: "<<serialData; print?

      Response: "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
      The portName is "ttyS4"
      currentPortName "ttyS4"
      Response: "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"

      VRoninV 1 Reply Last reply
      0
      • V Offline
        V Offline
        veera
        wrote on last edited by
        #10

        @VRonin
        I am getting the response as a hex bytes only so how to display onto the QPlainText ..

        aha_1980A 1 Reply Last reply
        0
        • T Offline
          T Offline
          Tirupathi Korla
          wrote on last edited by Tirupathi Korla
          #11

          @veera
          Hi,
          Serial.readall() returns QByteArray. Have you tried this?

          QString res(serialData);
          ui->ResWindow_plainTextEdit->appendPlainText(res);
          

          And one more question. Is that if(serial.waitForReadyRead(20000)) condition running inside any loop?

          -Tirupathi

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          • V veera

            @VRonin
            I am getting the response as a hex bytes only so how to display onto the QPlainText ..

            aha_1980A Offline
            aha_1980A Offline
            aha_1980
            Lifetime Qt Champion
            wrote on last edited by
            #12

            @veera said in How to append the serial read data on to the QPlaintext on qt gui window:

            @VRonin
            I am getting the response as a hex bytes only so how to display onto the QPlainText ..

            If you want to show the hex bytes in the text edit, you can use (modified @VRonin's example (the change is the toHex() in the first line):

            const auto serialData = serial.readAll().toHex();
            qDebug()<<"Response: "<<serialData;
            QTextCursor cursor(ui->ResWindow_plainTextEdit->document());
            cursor.movePosition(QTextCursor::End);
            cursor.insertText(QString::fromUtf8(serialData));
            

            Note that you could replace QString::fromUtf8() with QString::fromLatin1() in that case.

            Qt has to stay free or it will die.

            1 Reply Last reply
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            • V veera

              yes its writing on plaintext window.......

              qDebug()<<"Response: "<<serialData; print?

              Response: "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
              The portName is "ttyS4"
              currentPortName "ttyS4"
              Response: "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"

              VRoninV Offline
              VRoninV Offline
              VRonin
              wrote on last edited by
              #13

              @veera said in How to append the serial read data on to the QPlaintext on qt gui window:

              Response: "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"

              \x01 is not printable. What did you expect to see?

              "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
              ~Napoleon Bonaparte

              On a crusade to banish setIndexWidget() from the holy land of Qt

              1 Reply Last reply
              0
              • V Offline
                V Offline
                veera
                wrote on last edited by
                #14

                okay fine ...but response is coming what i am expecting i am writing some data for serial port like
                unsigned char rteenab[] = {0X01,0X0E,0X01,0X45,0XD1}; i am trying to print input and output onto the QPlaintext ......

                J.HilkJ 1 Reply Last reply
                0
                • V veera

                  okay fine ...but response is coming what i am expecting i am writing some data for serial port like
                  unsigned char rteenab[] = {0X01,0X0E,0X01,0X45,0XD1}; i am trying to print input and output onto the QPlaintext ......

                  J.HilkJ Offline
                  J.HilkJ Offline
                  J.Hilk
                  Moderators
                  wrote on last edited by
                  #15

                  @veera
                  You'll have to create a formated QString out of your Qbytearray for that. @VRonin and @aha_1980 showed you how to do it, heres a 3rd Way(I prefere a seperation and a more readable String):

                  const auto serialData = serial.readAll()
                  qDebug()<<"Response: "<<serialData;
                  
                  QString formatedText;
                  for(int i(0); i<serialData .size(); i++)
                      formatedText.append(QString::number((serialData.at(i),16).toUpper().rightJustified(2,'0')+ QChar(0x20));
                  
                  QTextCursor cursor(ui->ResWindow_plainTextEdit->document());
                  cursor.movePosition(QTextCursor::End);
                  cursor.insertText(formatedText);
                  

                  Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                  Q: What's that?
                  A: It's blue light.
                  Q: What does it do?
                  A: It turns blue.

                  aha_1980A 1 Reply Last reply
                  1
                  • J.HilkJ J.Hilk

                    @veera
                    You'll have to create a formated QString out of your Qbytearray for that. @VRonin and @aha_1980 showed you how to do it, heres a 3rd Way(I prefere a seperation and a more readable String):

                    const auto serialData = serial.readAll()
                    qDebug()<<"Response: "<<serialData;
                    
                    QString formatedText;
                    for(int i(0); i<serialData .size(); i++)
                        formatedText.append(QString::number((serialData.at(i),16).toUpper().rightJustified(2,'0')+ QChar(0x20));
                    
                    QTextCursor cursor(ui->ResWindow_plainTextEdit->document());
                    cursor.movePosition(QTextCursor::End);
                    cursor.insertText(formatedText);
                    
                    aha_1980A Offline
                    aha_1980A Offline
                    aha_1980
                    Lifetime Qt Champion
                    wrote on last edited by
                    #16

                    @J.Hilk: Note that for Qt 5.9 I added an overload of QByteArray::toHex(char separator) [1] where you can do something like

                    QByteArray hexData = data.toHex(' '); directly :)

                    [1] http://doc.qt.io/qt-5/qbytearray.html#toHex-1

                    Qt has to stay free or it will die.

                    J.HilkJ 1 Reply Last reply
                    4
                    • aha_1980A aha_1980

                      @J.Hilk: Note that for Qt 5.9 I added an overload of QByteArray::toHex(char separator) [1] where you can do something like

                      QByteArray hexData = data.toHex(' '); directly :)

                      [1] http://doc.qt.io/qt-5/qbytearray.html#toHex-1

                      J.HilkJ Offline
                      J.HilkJ Offline
                      J.Hilk
                      Moderators
                      wrote on last edited by J.Hilk
                      #17

                      @aha_1980 oO, I should read the change logs more thoroughly! Makes my life easier ;-) thanks!


                      Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                      Q: What's that?
                      A: It's blue light.
                      Q: What does it do?
                      A: It turns blue.

                      1 Reply Last reply
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