Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. QSerialPort open error code 10
Forum Updated to NodeBB v4.3 + New Features

QSerialPort open error code 10

Scheduled Pinned Locked Moved Solved General and Desktop
54 Posts 8 Posters 11.1k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • KroMignonK KroMignon

    @addebito said in QSerialPort open error code 10:

    find serial port: "COM5" / "Dispositivo seriale USB"

    Maybe that is your problem: "COM5" != "COM11"
    Is it the same serial port?

    A Offline
    A Offline
    addebito
    wrote on last edited by addebito
    #10

    @KroMignon I'm sorry, yes during the test I have also try to change the port number but the result is the same.
    Now I'm using the same port configured as COM5.
    The computer is my laptop and there is only this com port.

    KroMignonK 1 Reply Last reply
    0
    • A addebito

      @KroMignon I'm sorry, yes during the test I have also try to change the port number but the result is the same.
      Now I'm using the same port configured as COM5.
      The computer is my laptop and there is only this com port.

      KroMignonK Offline
      KroMignonK Offline
      KroMignon
      wrote on last edited by
      #11

      @addebito said in QSerialPort open error code 10:

      I'm sorry, yes during the test I have also try to change the port number but the result is the same.
      Now I'm using the same port configured as COM5.

      I am sorry, but I am not sure to understand you.
      Do you still have same error, even when using serial port detected with QSerialPortInfo::availablePorts()?

      It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

      A 1 Reply Last reply
      0
      • KroMignonK KroMignon

        @addebito said in QSerialPort open error code 10:

        I'm sorry, yes during the test I have also try to change the port number but the result is the same.
        Now I'm using the same port configured as COM5.

        I am sorry, but I am not sure to understand you.
        Do you still have same error, even when using serial port detected with QSerialPortInfo::availablePorts()?

        A Offline
        A Offline
        addebito
        wrote on last edited by
        #12

        Yes @KroMignon, I've the same error and I dont know how to resolve...

        find serial port: "COM5" / "Dispositivo seriale USB"
        "Can't open COM5, error code 10" "Parametro non corretto."

        I can download the source of QSerialPort and try to debug when I open it.
        It could help me to investigate the real problem?

        1 Reply Last reply
        0
        • Christian EhrlicherC Offline
          Christian EhrlicherC Offline
          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on last edited by
          #13

          Try to remove the setFoo() calls before open to see if it helps. If so re-add them until the error occurs again.

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

          A 1 Reply Last reply
          0
          • Christian EhrlicherC Christian Ehrlicher

            Try to remove the setFoo() calls before open to see if it helps. If so re-add them until the error occurs again.

            A Offline
            A Offline
            addebito
            wrote on last edited by
            #14

            Hi @Christian-Ehrlicher, what you means with setFoo() ?
            Did you mean setFlowControl ?

            I've try to remove it before open the com port but I get the same result.

            "Can't open COM5, error code 10" "Parametro non corretto."

            1 Reply Last reply
            0
            • Christian EhrlicherC Offline
              Christian EhrlicherC Offline
              Christian Ehrlicher
              Lifetime Qt Champion
              wrote on last edited by
              #15

              @addebito said in QSerialPort open error code 10:

              Did you mean setFlowControl ?

              all setXXX() - functions

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

              A 1 Reply Last reply
              0
              • Christian EhrlicherC Christian Ehrlicher

                @addebito said in QSerialPort open error code 10:

                Did you mean setFlowControl ?

                all setXXX() - functions

                A Offline
                A Offline
                addebito
                wrote on last edited by
                #16

                @Christian-Ehrlicher Nope, same error.

                    for (const auto &serialPortInfo : QSerialPortInfo::availablePorts())
                    {
                        qDebug() << "find serial port: " << serialPortInfo.portName() << "/" << serialPortInfo.description();
                    }
                
                    m_portName = "COM5";
                    m_serial   = new QSerialPort();
                    m_serial->setPortName(m_portName);
                    //    m_serial->setBaudRate(QSerialPort::Baud115200);
                    //    m_serial->setParity(QSerialPort::NoParity);
                    //    m_serial->setStopBits(QSerialPort::OneStop);
                    //    m_serial->setDataBits(QSerialPort::Data8);
                    //    m_serial->setFlowControl(QSerialPort::NoFlowControl);
                
                    if (!m_serial->open(QIODevice::ReadWrite))
                    {
                        qDebug() << QString("Can't open %1, error code %2").arg(m_portName).arg(m_serial->error()) << m_serial->errorString();
                        emit signalError(tr("Can't open %1, error code %2\n%3").arg(m_portName).arg(m_serial->error()).arg(m_serial->errorString()));
                        return;
                    }
                

                find serial port: "COM5" / "Dispositivo seriale USB"
                "Can't open COM5, error code 10" "Parametro non corretto."

                1 Reply Last reply
                0
                • Christian EhrlicherC Offline
                  Christian EhrlicherC Offline
                  Christian Ehrlicher
                  Lifetime Qt Champion
                  wrote on last edited by
                  #17

                  Ok, was just a guess... looks like you have to download the debug symbols and debug into QSerialPort.
                  Do you have maybe another USB-serial converter for testing?

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

                  A 1 Reply Last reply
                  0
                  • K Offline
                    K Offline
                    kuzulis
                    Qt Champions 2020
                    wrote on last edited by kuzulis
                    #18

                    You can try the following WinAPI code at first:

                        QByteArray systemLocation = "COM5";
                        DWORD desiredAccess = GENERIC_READ | GENERIC_WRITE;
                    
                        HANDLE handle = ::CreateFile(reinterpret_cast<const wchar_t*>(systemLocation.utf16()),
                                                  desiredAccess, 0, nullptr, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, nullptr);
                        if (handle == INVALID_HANDLE_VALUE) {
                            // OOPS
                            const DWORD error = ::GetLastError();
                            qDebug() << "ERROR:" << error;
                        }
                    

                    ti see what happens.

                    A 1 Reply Last reply
                    3
                    • K Offline
                      K Offline
                      kuzulis
                      Qt Champions 2020
                      wrote on last edited by
                      #19

                      I can download the source of QSerialPort and try to debug when I open it.
                      It could help me to investigate the real problem?

                      Yes, of course.

                      1 Reply Last reply
                      0
                      • K kuzulis

                        You can try the following WinAPI code at first:

                            QByteArray systemLocation = "COM5";
                            DWORD desiredAccess = GENERIC_READ | GENERIC_WRITE;
                        
                            HANDLE handle = ::CreateFile(reinterpret_cast<const wchar_t*>(systemLocation.utf16()),
                                                      desiredAccess, 0, nullptr, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, nullptr);
                            if (handle == INVALID_HANDLE_VALUE) {
                                // OOPS
                                const DWORD error = ::GetLastError();
                                qDebug() << "ERROR:" << error;
                            }
                        

                        ti see what happens.

                        A Offline
                        A Offline
                        addebito
                        wrote on last edited by
                        #20

                        @kuzulis I get the error 2.... file doesn't exist ??
                        the error code 2 is really file not exixt ??

                        Screenshot from Windows device manager:

                        17ebc648-69aa-4e80-8854-e00d61ee7412-immagine.png

                        This is the code.

                            DWORD desiredAccess = GENERIC_READ | GENERIC_WRITE;
                        
                            HANDLE handle = ::CreateFile(reinterpret_cast<const wchar_t *>("COM5"), desiredAccess, 0, nullptr, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, nullptr);
                            if (handle == INVALID_HANDLE_VALUE)
                            {
                                // OOPS
                                const DWORD error = ::GetLastError();
                                qDebug() << "ERROR:" << error;
                            }
                        
                        1 Reply Last reply
                        0
                        • Christian EhrlicherC Christian Ehrlicher

                          Ok, was just a guess... looks like you have to download the debug symbols and debug into QSerialPort.
                          Do you have maybe another USB-serial converter for testing?

                          A Offline
                          A Offline
                          addebito
                          wrote on last edited by addebito
                          #21

                          @Christian-Ehrlicher said in QSerialPort open error code 10:

                          Do you have maybe another USB-serial converter for testing?

                          No, is not a USB serial converter but is a USB connected directly on the device/board.
                          I can ask my customer to give me back the fisrt board (the one that I starting to work with).
                          It could be the board or firmware yes.... but why with Hercules I can communicate without problems ??

                          1 Reply Last reply
                          0
                          • Christian EhrlicherC Offline
                            Christian EhrlicherC Offline
                            Christian Ehrlicher
                            Lifetime Qt Champion
                            wrote on last edited by
                            #22

                            @addebito said in QSerialPort open error code 10:

                            reinterpret_cast<const wchar_t *>("COM5")

                            And this is wrong. Either use the solution from @kuzulis or pass a proper utf-16 encoded string: L"COM5"

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

                            A 1 Reply Last reply
                            3
                            • Christian EhrlicherC Christian Ehrlicher

                              @addebito said in QSerialPort open error code 10:

                              reinterpret_cast<const wchar_t *>("COM5")

                              And this is wrong. Either use the solution from @kuzulis or pass a proper utf-16 encoded string: L"COM5"

                              A Offline
                              A Offline
                              addebito
                              wrote on last edited by
                              #23

                              @Christian-Ehrlicher you are right but there isn't a call ".utf16()" in QByteArray class so I've replaced with a mistake.

                              Now the CreateFile with L"COM5" works. I don't get any error.

                              Christian EhrlicherC 1 Reply Last reply
                              0
                              • A addebito

                                @Christian-Ehrlicher you are right but there isn't a call ".utf16()" in QByteArray class so I've replaced with a mistake.

                                Now the CreateFile with L"COM5" works. I don't get any error.

                                Christian EhrlicherC Offline
                                Christian EhrlicherC Offline
                                Christian Ehrlicher
                                Lifetime Qt Champion
                                wrote on last edited by
                                #24

                                @addebito said in QSerialPort open error code 10:

                                QByteArray

                                Because it should be QString :)

                                Ok, then you have to debug by yourself, don't see what should go wrong within QSerialPort code nor can I test it locally.

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

                                A 1 Reply Last reply
                                0
                                • Christian EhrlicherC Christian Ehrlicher

                                  @addebito said in QSerialPort open error code 10:

                                  QByteArray

                                  Because it should be QString :)

                                  Ok, then you have to debug by yourself, don't see what should go wrong within QSerialPort code nor can I test it locally.

                                  A Offline
                                  A Offline
                                  addebito
                                  wrote on last edited by addebito
                                  #25

                                  @Christian-Ehrlicher said in QSerialPort open error code 10:

                                  Ok, then you have to debug by yourself, don't see what should go wrong within QSerialPort code nor can I test it locally.

                                  Yes but is not as easy as I thought.
                                  I've run the maintenance QT software and I've check if the source was installed.

                                  60e27300-e95c-4640-8d1c-b0a0236db1a3-immagine.png

                                  I've created a simple demo project and added this lines inside the .pro

                                  include(C:/Qt/5.14.2/Src/qtserialport/src/serialport/serialport-lib.pri)
                                  

                                  I have to add also these lines to resolve some issues

                                  INCLUDEPATH += "C:/Qt/5.14.2/Src/qtbase/include/QtCore/5.14.2/QtCore"
                                  INCLUDEPATH += "C:/Qt/5.14.2/Src/qtbase/include/QtCore/5.14.2"
                                  INCLUDEPATH += "C:/Qt/5.14.2/msvc2017_64/include/QtCore/5.14.2"
                                  

                                  But now, when I compile I get this error:

                                  38197876-cda2-4183-8712-84ff8cd559d2-immagine.png

                                  definition of dllimport static data member not allowed

                                  I think there is something wrong in my approach...
                                  How should i do to debug QSerialPort class?
                                  thank you for your time and your patience.

                                  1 Reply Last reply
                                  0
                                  • Christian EhrlicherC Offline
                                    Christian EhrlicherC Offline
                                    Christian Ehrlicher
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #26

                                    I don't understand why you try to compile QSerialPort by yourself. Install the debug symbols and sources, compile your app with debug informations, add a breakpoint on QSP::open() call and step into the call.

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

                                    A 1 Reply Last reply
                                    1
                                    • Christian EhrlicherC Christian Ehrlicher

                                      I don't understand why you try to compile QSerialPort by yourself. Install the debug symbols and sources, compile your app with debug informations, add a breakpoint on QSP::open() call and step into the call.

                                      A Offline
                                      A Offline
                                      addebito
                                      wrote on last edited by addebito
                                      #27

                                      @Christian-Ehrlicher what you means with "Install the debug symbols and sources"?

                                      I'm in debug with a breakpoint but if try to step into by F11...

                                      d7196e67-9508-42a5-a240-0ec3910a5d33-immagine.png

                                      b2c95cad-6693-42e3-a10a-da1530295797-immagine.png

                                      KroMignonK 1 Reply Last reply
                                      0
                                      • A addebito

                                        @Christian-Ehrlicher what you means with "Install the debug symbols and sources"?

                                        I'm in debug with a breakpoint but if try to step into by F11...

                                        d7196e67-9508-42a5-a240-0ec3910a5d33-immagine.png

                                        b2c95cad-6693-42e3-a10a-da1530295797-immagine.png

                                        KroMignonK Offline
                                        KroMignonK Offline
                                        KroMignon
                                        wrote on last edited by
                                        #28

                                        @addebito said in QSerialPort open error code 10:

                                        what you means with "Install the debug symbols and sources"?

                                        With Maintenance Tool, select "Sources" and "Qt Debug Information Files" for the select Qt Version:
                                        3ca5c8cb-9646-4d2a-a8c7-bc957ad0ebda-image.png

                                        Then build your project in "Debug" and start debugging.

                                        It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                                        A 1 Reply Last reply
                                        1
                                        • KroMignonK KroMignon

                                          @addebito said in QSerialPort open error code 10:

                                          what you means with "Install the debug symbols and sources"?

                                          With Maintenance Tool, select "Sources" and "Qt Debug Information Files" for the select Qt Version:
                                          3ca5c8cb-9646-4d2a-a8c7-bc957ad0ebda-image.png

                                          Then build your project in "Debug" and start debugging.

                                          A Offline
                                          A Offline
                                          addebito
                                          wrote on last edited by
                                          #29

                                          @KroMignon I've already installed but I don't see anything when I step into...
                                          I see only the debugger on line 118 (qflags.h) and after F11 again the debugger return on my mainwindow.cpp.

                                          a95dbbc9-6205-48f1-90f4-0f9cb11f83b1-immagine.png

                                          J.HilkJ Christian EhrlicherC 2 Replies Last reply
                                          0

                                          • Login

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Categories
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups
                                          • Search
                                          • Get Qt Extensions
                                          • Unsolved