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Unable to read from QSerialPort using MSVC compiler

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qserialportmingwmsvcread serial
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  • T Turi

    @jsulm
    I removed QThread::msleep(50) and added a connect to the readyRead signal but I'm still unable to read the serial, the connect is never called. Also with the connect, it is solicited if I use MinGW compiler but not with MSVC.

    jsulmJ Online
    jsulmJ Online
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #7

    @Turi said in Unable to read from QSerialPort using MSVC compiler:

    the connect is never called. Also with the connect, it is solicited if I use MinGW compiler but not with MSVC.

    I don't understand this.
    Do you mean the connect(...) is never called? Then fix that.
    Or do you mean the slot is not called?
    Please show your connect call and also check its return value.

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

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    • T Turi

      @jsulm
      I removed QThread::msleep(50) and added a connect to the readyRead signal but I'm still unable to read the serial, the connect is never called. Also with the connect, it is solicited if I use MinGW compiler but not with MSVC.

      jsulmJ Online
      jsulmJ Online
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #8

      @Turi And also please do what @J-Hilk suggested.

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

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      • T Offline
        T Offline
        Turi
        wrote on last edited by Turi
        #9

        @jsulm
        I have already followed the suggestions of @J-Hilk .
        This is my connect:

        bool ok = connect(serial, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
        

        After that the value of' ok' is true, but the SLOT is never called.

        jsulmJ 1 Reply Last reply
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        • T Turi

          @jsulm
          I have already followed the suggestions of @J-Hilk .
          This is my connect:

          bool ok = connect(serial, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
          

          After that the value of' ok' is true, but the SLOT is never called.

          jsulmJ Online
          jsulmJ Online
          jsulm
          Lifetime Qt Champion
          wrote on last edited by jsulm
          #10

          @Turi said in Unable to read from QSerialPort using MSVC compiler:

          I have already followed the suggestions of @J-Hilk

          No, I was refering to this:
          "also connect to the error signal errorOccured
          https://doc.qt.io/qt-5/qserialport.html#errorOccurred"

          And you should use the Qt5 connect syntax: https://doc.qt.io/qt-5/signalsandslots.html

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

          T 1 Reply Last reply
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          • jsulmJ jsulm

            @Turi said in Unable to read from QSerialPort using MSVC compiler:

            I have already followed the suggestions of @J-Hilk

            No, I was refering to this:
            "also connect to the error signal errorOccured
            https://doc.qt.io/qt-5/qserialport.html#errorOccurred"

            And you should use the Qt5 connect syntax: https://doc.qt.io/qt-5/signalsandslots.html

            T Offline
            T Offline
            Turi
            wrote on last edited by
            #11

            @jsulm
            I have already tried all this and all seem work fine, without any error. But my application still does not read from the serial only if I use the MSVC compiler.

            jsulmJ J.HilkJ 2 Replies Last reply
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            • T Turi

              @jsulm
              I have already tried all this and all seem work fine, without any error. But my application still does not read from the serial only if I use the MSVC compiler.

              jsulmJ Online
              jsulmJ Online
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #12

              @Turi Did you verify that the other side sends something?

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

              T 1 Reply Last reply
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              • T Turi

                @jsulm
                I have already tried all this and all seem work fine, without any error. But my application still does not read from the serial only if I use the MSVC compiler.

                J.HilkJ Offline
                J.HilkJ Offline
                J.Hilk
                Moderators
                wrote on last edited by
                #13

                @Turi what versions are we actually talking here ?

                Qt(from the kit), msvc, windows etc.

                and can you show more of your actually class that does the serial communication?


                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.

                T 1 Reply Last reply
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                • jsulmJ jsulm

                  @Turi Did you verify that the other side sends something?

                  T Offline
                  T Offline
                  Turi
                  wrote on last edited by
                  #14

                  @jsulm
                  Yes, the other side reveives and sends messages.

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                  • J.HilkJ J.Hilk

                    @Turi what versions are we actually talking here ?

                    Qt(from the kit), msvc, windows etc.

                    and can you show more of your actually class that does the serial communication?

                    T Offline
                    T Offline
                    Turi
                    wrote on last edited by
                    #15

                    @J-Hilk
                    I'm using:

                    • Qt Creator 4.9.0
                    • Based on Qt 5.12.2 (MSVC 2017, 32 bit)
                    • Windows 10 Enterprise

                    Unfortunately I can't show more of my actually class due to the fact that is reserved code.

                    jsulmJ 1 Reply Last reply
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                    • T Turi

                      @J-Hilk
                      I'm using:

                      • Qt Creator 4.9.0
                      • Based on Qt 5.12.2 (MSVC 2017, 32 bit)
                      • Windows 10 Enterprise

                      Unfortunately I can't show more of my actually class due to the fact that is reserved code.

                      jsulmJ Online
                      jsulmJ Online
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #16

                      @Turi said in Unable to read from QSerialPort using MSVC compiler:

                      Based on Qt 5.12.2 (MSVC 2017, 32 bit)

                      This is the Qt version which was used to build QtCreator.
                      What Qt version do you use?

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

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                      • T Offline
                        T Offline
                        Turi
                        wrote on last edited by
                        #17

                        Qt 5.12.3
                        MinGW 7.3.0 32-bit
                        MSVC 2017 32-bit

                        jsulmJ 1 Reply Last reply
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                        • T Turi

                          Qt 5.12.3
                          MinGW 7.3.0 32-bit
                          MSVC 2017 32-bit

                          jsulmJ Online
                          jsulmJ Online
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by
                          #18

                          @Turi Can you try with 5.15.2?

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

                          T 1 Reply Last reply
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                          • jsulmJ jsulm

                            @Turi Can you try with 5.15.2?

                            T Offline
                            T Offline
                            Turi
                            wrote on last edited by
                            #19

                            @jsulm
                            Can you pass me a link where I can download this version?

                            jsulmJ 1 Reply Last reply
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                            • T Offline
                              T Offline
                              Turi
                              wrote on last edited by
                              #20

                              I tried with Qt 5.12.2 but not work.

                              jsulmJ 1 Reply Last reply
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                              • T Turi

                                @jsulm
                                Can you pass me a link where I can download this version?

                                jsulmJ Online
                                jsulmJ Online
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #21

                                @Turi said in Unable to read from QSerialPort using MSVC compiler:

                                Can you pass me a link where I can download this version?

                                Use the Qt Maintenance Tool to add that Qt version to your installation.

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

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                                • T Turi

                                  I tried with Qt 5.12.2 but not work.

                                  jsulmJ Online
                                  jsulmJ Online
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #22

                                  @Turi said in Unable to read from QSerialPort using MSVC compiler:

                                  I tried with Qt 5.12.2 but not work.

                                  I seggested 5.15.2, not 5.12.2

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

                                  T 1 Reply Last reply
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                                  • jsulmJ jsulm

                                    @Turi said in Unable to read from QSerialPort using MSVC compiler:

                                    I tried with Qt 5.12.2 but not work.

                                    I seggested 5.15.2, not 5.12.2

                                    T Offline
                                    T Offline
                                    Turi
                                    wrote on last edited by
                                    #23

                                    @jsulm Sorry, my bad. With Qt 5.15.2 my application works fine. Thank you.
                                    So, is this a bug of older versions?

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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #24

                                      There was a bug with QSerialPort on Windows but IIRC it has been also fixed for the 5.12 series if you really need it. But you have to update to the latest release of that series.

                                      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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                                      • Christian EhrlicherC Offline
                                        Christian EhrlicherC Offline
                                        Christian Ehrlicher
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #25

                                        Here the bug report for this issue: https://bugreports.qt.io/browse/QTBUG-78086

                                        Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                                        Visit the Qt Academy at https://academy.qt.io/catalog

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