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Qt output too verbose

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  • E Offline
    E Offline
    enutt
    wrote on last edited by
    #1

    Hi there,

    How can I adjust the verbosity of applications that use Qt? I'm using the Qt installed by package manager in Ubuntu 12.04 lts. For instance, all my applications print stuff to the terminal:

    @
    Got bus address: "unix:abstract=/tmp/dbus-uYtYuIHkwF,guid=bf09af5765943413637ce5a500000313"
    Connected to accessibility bus at: "unix:abstract=/tmp/dbus-uYtYuIHkwF,guid=bf09af5765943413637ce5a500000313"
    Registered DEC: true
    Registered event listener change listener: true
    @

    And using ui features causes more stuff to print:

    @
    QSpiAccessible::accessibleEvent not handled: "6" obj: QMenu(0x10902c0, name = "menuFile") "menuFile"
    QSpiAccessible::accessibleEvent not handled: "7" obj: QMenu(0x10902c0, name = "menuFile") "menuFile"
    @

    Is there a way to disable this log?

    Thanks.

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    0
    • M Offline
      M Offline
      MuldeR
      wrote on last edited by
      #2

      Install your own "dummy" message handler:

      @void myMessageOutput(QtMsgType type, const char *msg)
      {
      /do nothing, i.e. discard message completely/
      }

      int main(int argc, char **argv)
      {
      qInstallMsgHandler(myMessageOutput);

      /* ... */
      

      }@

      --

      See also:
      http://qt-project.org/doc/qt-4.8/qtglobal.html#qInstallMsgHandler

      My OpenSource software at: http://muldersoft.com/

      Qt v4.8.6 MSVC 2013, static/shared: http://goo.gl/BXqhrS

      Go visit the coop: http://youtu.be/Jay...

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      • E Offline
        E Offline
        enutt
        wrote on last edited by
        #3

        Thanks for the answer! Although, I don't understand why this is necessary. When running the same application on two difference machines, only one of them prints messages from Qt in such a verbose way. Why is this?

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        0
        • M Offline
          M Offline
          MuldeR
          wrote on last edited by
          #4

          If you don't install your own message handler, the default one writes the output the STDOUT stream. On Linux, if you run a GUI application from the terminal, the STDOUT becomes visible there. If you run the GUI application without a terminal (e.g. from Nautilus) you simply don't see the STDOUT anywhere (it probably goes to /dev/null). And on Windows, the STDOUT of GUI applications is discarded anyway, even if you run them from a console.

          My OpenSource software at: http://muldersoft.com/

          Qt v4.8.6 MSVC 2013, static/shared: http://goo.gl/BXqhrS

          Go visit the coop: http://youtu.be/Jay...

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