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. [Solved] Use of signal-slot connect in Windows 10
Forum Update on Monday, May 27th 2025

[Solved] Use of signal-slot connect in Windows 10

Scheduled Pinned Locked Moved General and Desktop
windows 10signal-slotconnectconnect failureqt 5.4.1
24 Posts 4 Posters 11.5k Views
  • 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.
  • K Offline
    K Offline
    koahnig
    wrote on last edited by
    #13

    @SGaist @JKSH @mrjj

    Just for closing the issue here. I have the new syntax for connect. I love it, even though it has "drawbacks" of different functionality according the documentation presented by JKSH above. For me it is perfect! Thanks again for pointing towards teh new syntax.

    Vote the answer(s) that helped you to solve your issue(s)

    1 Reply Last reply
    0
    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #14

      May I humbly suggest to follow your signature ? ;)

      K 1 Reply Last reply
      2
      • mrjjM mrjj

        May I humbly suggest to follow your signature ? ;)

        K Offline
        K Offline
        koahnig
        wrote on last edited by
        #15

        @mrjj
        Actually, my initial problem is not solved. ;)
        The warning at wrong connects still seems to be gone. Which might be a either a problem with my installation or a bug in Qt.

        Vote the answer(s) that helped you to solve your issue(s)

        mrjjM JKSHJ 2 Replies Last reply
        0
        • K koahnig

          @mrjj
          Actually, my initial problem is not solved. ;)
          The warning at wrong connects still seems to be gone. Which might be a either a problem with my installation or a bug in Qt.

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by mrjj
          #16

          @koahnig
          oh. Well. My bad :)
          I tried to install win 10 to but it wont upgrade.
          Pretty strange what ever made it stop to display.

          1 Reply Last reply
          0
          • K koahnig

            @mrjj
            Actually, my initial problem is not solved. ;)
            The warning at wrong connects still seems to be gone. Which might be a either a problem with my installation or a bug in Qt.

            JKSHJ Offline
            JKSHJ Offline
            JKSH
            Moderators
            wrote on last edited by
            #17

            @koahnig said:

            The warning at wrong connects still seems to be gone.

            I get the error message for wrong connections, and I'm using Qt 5.5.1 MinGW 4.9.2 32-bit and Qt 5.4.2 MSVC 2013 32-bit on Windows 10 Pro 64-bit.

            Does qDebug() and qWarning() work for you?

            Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

            K 1 Reply Last reply
            0
            • JKSHJ JKSH

              @koahnig said:

              The warning at wrong connects still seems to be gone.

              I get the error message for wrong connections, and I'm using Qt 5.5.1 MinGW 4.9.2 32-bit and Qt 5.4.2 MSVC 2013 32-bit on Windows 10 Pro 64-bit.

              Does qDebug() and qWarning() work for you?

              K Offline
              K Offline
              koahnig
              wrote on last edited by
              #18

              @JKSH said:

              I get the error message for wrong connections, and I'm using Qt 5.5.1 MinGW 4.9.2 32-bit and Qt 5.4.2 MSVC 2013 32-bit on Windows 10 Pro 64-bit.

              Does qDebug() and qWarning() work for you?

              I am using qDebug all the time. It does work.

              Vote the answer(s) that helped you to solve your issue(s)

              JKSHJ 1 Reply Last reply
              0
              • K koahnig

                @JKSH said:

                I get the error message for wrong connections, and I'm using Qt 5.5.1 MinGW 4.9.2 32-bit and Qt 5.4.2 MSVC 2013 32-bit on Windows 10 Pro 64-bit.

                Does qDebug() and qWarning() work for you?

                I am using qDebug all the time. It does work.

                JKSHJ Offline
                JKSHJ Offline
                JKSH
                Moderators
                wrote on last edited by
                #19

                @koahnig said:

                I am using qDebug all the time. It does work.

                How about qWarning()?

                Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                K 1 Reply Last reply
                0
                • JKSHJ JKSH

                  @koahnig said:

                  I am using qDebug all the time. It does work.

                  How about qWarning()?

                  K Offline
                  K Offline
                  koahnig
                  wrote on last edited by
                  #20

                  @JKSH
                  qWarning is also working.
                  However, your last question brought up a clue of what might have been the case.

                  I am using a message handler for redirecting the output of qDebug. It allows to ignore all output, to store all to a file and/or to the screen.
                  Since there is a lot of output, the screen output is slowing down dramatically. Therefore, I have redirected the output only to the file. The assert was probably kicking in before the message was written to the file. I have seen this with other output before, but never with the warning for connection failures (Probably I had also screen output then).

                  Anyway even when the problem was between chair and keyboard, it was good to have the discussion. Otherwise I would not have learnt about the new syntax.

                  Thanks again.

                  Vote the answer(s) that helped you to solve your issue(s)

                  1 Reply Last reply
                  0
                  • K Offline
                    K Offline
                    koahnig
                    wrote on last edited by
                    #21

                    A point I have missed in my previous response.

                    I have written a small test this time.

                    #include "Clas.h"
                    #include <QTimer>
                    #include <QDebug>
                    
                    Clas::Clas(QObject *parent) :
                        QObject(parent)
                    {
                        QTimer *timea = new QTimer ( this );
                        connect ( timea, SIGNAL ( timerout() ), this, SLOT (sltQuit() ) );
                        qDebug() << "debug";
                        qWarning() << "warning";
                    }
                    void Clas::sltQuit()
                    {
                    }
                    

                    and here is the output

                    Qt: Untested Windows version 10.0 detected!
                    QObject::connect: No such signal QTimer::timerout() in ..\..\Test\CheckConnect\Clas.cpp:9
                    debug
                    warning
                    

                    So it is working perfectly also on windows 10 with MinGW version Qt 5.4.1.

                    Vote the answer(s) that helped you to solve your issue(s)

                    1 Reply Last reply
                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #22

                      Just saw something: the warning's right, the signal is timeout not timerout

                      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
                      • JKSHJ Offline
                        JKSHJ Offline
                        JKSH
                        Moderators
                        wrote on last edited by
                        #23

                        Great! :)

                        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                        1 Reply Last reply
                        0
                        • SGaistS SGaist

                          Just saw something: the warning's right, the signal is timeout not timerout

                          K Offline
                          K Offline
                          koahnig
                          wrote on last edited by
                          #24

                          @SGaist
                          Yes. That was intensional. I just tested that my installation is still providing the message.
                          Thanks a lot anyway.

                          Vote the answer(s) that helped you to solve your issue(s)

                          1 Reply 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