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Implementing Thread Safe logging in my Qt Application

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  • kshegunovK kshegunov

    @Absurd said in Implementing Thread Safe logging in my Qt Application:

    Sorry... I forgot to mention; I am using Qt4. The above is only available since Qt5.2.

    Any specific reason to use an EOL product version for new development?

    A Offline
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    Absurd
    wrote on last edited by Absurd
    #5

    @kshegunov Yes; qt4 is installed by default on all of our servers (don't know why, it just how it is), as oppose to qt5 which I'll have to install.
    I want my app to run without any additional installations.

    kshegunovK 1 Reply Last reply
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    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #6

      When I would be your server admin I would not allow you to add a new application with a library which last was updated more than 4 years ago... but if you want to develop with such an old library you have to do such work on your own...
      Otherwise I would have suggested to use log4qt from here

      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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      • A Absurd

        @kshegunov Yes; qt4 is installed by default on all of our servers (don't know why, it just how it is), as oppose to qt5 which I'll have to install.
        I want my app to run without any additional installations.

        kshegunovK Offline
        kshegunovK Offline
        kshegunov
        Moderators
        wrote on last edited by
        #7

        @Absurd said in Implementing Thread Safe logging in my Qt Application:

        I want my app to run without any additional installations.

        You should rethink that, as Qt 4.8.7 was released 3 years ago and is the last patch release of the Qt 4.8 minor release, which itself was released over 8 years ago. You should either upgrade your server(s), or build Qt 5 yourself and use it for new development. Otherwise your approach (in the OP) appears sound.

        Read and abide by the Qt Code of Conduct

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        • Christian EhrlicherC Christian Ehrlicher

          When I would be your server admin I would not allow you to add a new application with a library which last was updated more than 4 years ago... but if you want to develop with such an old library you have to do such work on your own...
          Otherwise I would have suggested to use log4qt from here

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          Absurd
          wrote on last edited by
          #8

          @Christian-Ehrlicher
          We have few more tools that are implemented with qt4 (for historic reasons, I believe).
          What harm could that do? (developing with an old library)

          Thanks, I'll give logqt4 a try...

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          • Christian EhrlicherC Offline
            Christian EhrlicherC Offline
            Christian Ehrlicher
            Lifetime Qt Champion
            wrote on last edited by
            #9

            Security-wise it's a nightmare to use a library which is not up-to-date.
            And log4qt only works with Qt5(.9)and above

            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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            • Christian EhrlicherC Christian Ehrlicher

              Security-wise it's a nightmare to use a library which is not up-to-date.
              And log4qt only works with Qt5(.9)and above

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              Absurd
              wrote on last edited by
              #10

              @Christian-Ehrlicher we use these machines for internal debug only (so are our tools)...

              aha_1980A 1 Reply Last reply
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              • A Absurd

                @Christian-Ehrlicher we use these machines for internal debug only (so are our tools)...

                aha_1980A Offline
                aha_1980A Offline
                aha_1980
                Lifetime Qt Champion
                wrote on last edited by
                #11

                @Absurd as you have to deploy your app to the server anyway, why not deploy Qt 5 together with them?

                All existing apps stay unchanged, but the new ones start using their own libraries.

                Qt Creator does it like this, for example.

                Qt has to stay free or it will die.

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                • aha_1980A aha_1980

                  @Absurd as you have to deploy your app to the server anyway, why not deploy Qt 5 together with them?

                  All existing apps stay unchanged, but the new ones start using their own libraries.

                  Qt Creator does it like this, for example.

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                  Absurd
                  wrote on last edited by Absurd
                  #12

                  @aha_1980 to be honest, I'd prefer working with qt5, and I also tried to install it on one of our machines before starting the project, but I ran into so many problems and it was so complicated so I gave up.

                  Now it's too late anyway, because I wrote so much code in qt4... (unless qt5 is completely backward compatible with qt4)

                  aha_1980A 1 Reply Last reply
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                  • A Absurd

                    @aha_1980 to be honest, I'd prefer working with qt5, and I also tried to install it on one of our machines before starting the project, but I ran into so many problems and it was so complicated so I gave up.

                    Now it's too late anyway, because I wrote so much code in qt4... (unless qt5 is completely backward compatible with qt4)

                    aha_1980A Offline
                    aha_1980A Offline
                    aha_1980
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    @Absurd

                    Now it's too late anyway, because I wrote so much code in qt4...

                    For sure not ;)

                    (unless qt5 is completely backward compatible with qt4)

                    Not completely, but in many ways. I've a lot of tools compatible with both versions. That needs a few #ifdef, but that's it.

                    I'd recommend doing the upgrade incrementally, because Qt 6 will appear in 2..3 years and Qt 5 will be similar to what Qt 4 is now.

                    Qt has to stay free or it will die.

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                    • A Offline
                      A Offline
                      Absurd
                      wrote on last edited by
                      #14

                      @aha_1980 Thanks. I'll give the qt5 installation one more try.

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