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Regarding Projector Programming using QT

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  • P Offline
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    Prath
    wrote on last edited by
    #19

    I think it is correct @jsulm. We are catching the signal using the slot and then displaying the signal.

    JonBJ 1 Reply Last reply
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    • P Prath

      I think it is correct @jsulm. We are catching the signal using the slot and then displaying the signal.

      JonBJ Online
      JonBJ Online
      JonB
      wrote on last edited by
      #20

      @Prath
      You wrote

      connect(this->Serial,SIGNAL(error(QSerialPort::SerialPortError)),this,SLOT(errorReport(QSerialPort::SerialPortError)));
      

      Where you have SIGNAL(error(QSerialPort::SerialPortError)) @jsulm is expecting SIGNAL(errorOccurred(QSerialPort::SerialPortError)). If what you have works, we do not understand how.

      If you are writing new code and would change over to the new signal/slot syntax you would presumably receive a compile-time error.

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      • P Offline
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        Prath
        wrote on last edited by
        #21

        Sorry for the delay guys. I tried again with the code and couldn't retrieve anything from the serial port regarding the errror.
        I got the attached error:-
        IMG_20191124_125954.jpg

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #22

          Your MainWindow class does not have such a signal, it's one from the QSerialPort.

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

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          • P Offline
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            Prath
            wrote on last edited by
            #23

            Didnt get you @SGaist .
            Could you please help me with the syntax

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            • P Offline
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              Prath
              wrote on last edited by
              #24

              When I click on the push button the function on_pushButton_clicked is called and then I call the Qserialport to check the error. I think the code is written correctly.

              What's your take?

              jsulmJ 1 Reply Last reply
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              • P Prath

                When I click on the push button the function on_pushButton_clicked is called and then I call the Qserialport to check the error. I think the code is written correctly.

                What's your take?

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #25

                @Prath said in Regarding Projector Programming using QT:

                What's your take?

                Your connect is wrong: MainWindow does NOT have signal error(QSerialPort::QSerialPort), this signal is in QSerialPort, so not in "this" but in "serial".

                And please do not post screen-shots, copy paste your code...

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                JonBJ 1 Reply Last reply
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                • jsulmJ jsulm

                  @Prath said in Regarding Projector Programming using QT:

                  What's your take?

                  Your connect is wrong: MainWindow does NOT have signal error(QSerialPort::QSerialPort), this signal is in QSerialPort, so not in "this" but in "serial".

                  And please do not post screen-shots, copy paste your code...

                  JonBJ Online
                  JonBJ Online
                  JonB
                  wrote on last edited by
                  #26

                  @jsulm , @Prath

                  this signal is in QSerialPort, so not in "this" but in "serial".

                  Is this a case where changing to new-style signal/slot syntax would generate an error for the wrong "context" variable? Or, would testing the return result from the connect() or from https://doc.qt.io/qt-5/qmetaobject-connection.html#operator-bool in code tell the user if the connection has failed because of the wrong context?

                  jsulmJ 1 Reply Last reply
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                  • JonBJ JonB

                    @jsulm , @Prath

                    this signal is in QSerialPort, so not in "this" but in "serial".

                    Is this a case where changing to new-style signal/slot syntax would generate an error for the wrong "context" variable? Or, would testing the return result from the connect() or from https://doc.qt.io/qt-5/qmetaobject-connection.html#operator-bool in code tell the user if the connection has failed because of the wrong context?

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #27

                    @JonB Yes, new connect syntax would help here, unless MainWindow has a signal with exact same signature :-)

                    https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • P Offline
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                      Prath
                      wrote on last edited by
                      #28

                      Guys can we send two commands to two serial ports concurrently using QT?

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #29

                        If you mean use several QSerialPorts at the same time in one application then yes, no problem with that. If you mean something else, please give more details.

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

                        P 1 Reply Last reply
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                        • SGaistS SGaist

                          If you mean use several QSerialPorts at the same time in one application then yes, no problem with that. If you mean something else, please give more details.

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                          Prath
                          wrote on last edited by
                          #30
                          This post is deleted!
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