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  4. [Solved] How to show Qt debug messages outside the debugger
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[Solved] How to show Qt debug messages outside the debugger

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  • K Offline
    K Offline
    kamalakshantv
    wrote on last edited by
    #8

    Seems in that case you will have to log it to a file.

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    • G Offline
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      giesbert
      wrote on last edited by
      #9

      You can install message handlers in Qt, to catch the debug messages and do with them, what you need. I know, there is a possibility, but I'm not 100% sure, how.

      Nokia Certified Qt Specialist.
      Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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      • G Offline
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        giesbert
        wrote on last edited by
        #10

        I looked a bit for information about this topic:
        "Here som general things about debugging (also to Mac)":http://doc.qt.nokia.com/4.7/debug.html

        bq. The Qt implementation of these functions prints the text to the stderr output under Unix/X11 and Mac OS X. With Windows, if it is a console application, the text is sent to console; otherwise, it is sent to the debugger. You can take over these functions by installing a message handler using qInstallMsgHandler().

        So it also shows a way you can go to use "custom message handlers":http://doc.qt.nokia.com/4.7/qtglobal.html#qInstallMsgHandler

        Nokia Certified Qt Specialist.
        Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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        • G Offline
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          goetz
          wrote on last edited by
          #11

          On Mac OS X the debug output goes to the system logger. You can read it with the Console Application (Usually in /Applications/Utilities/Console.app).

          For your own logging facilities "qInstallMsgHandler()":http://doc.qt.nokia.com/latest/qtglobal.html#qInstallMsgHandler is your friend (that's the solution Gerolf mentioned).

          I once wrote a small GUI that collects the qXXX() messages. I can put it in the wiki on request.

          http://www.catb.org/~esr/faqs/smart-questions.html

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          • K Offline
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            kamalakshantv
            wrote on last edited by
            #12

            You can get some help using qInstallMsgHandler() from "this":http://lists.trolltech.com/qt-interest/2006-05/msg00602.html thread too.

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            • A Offline
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              andre
              wrote on last edited by
              #13

              QxtLogger can install itself the hander for Qt's debug messages as well, and you can use several outputs for your logging info. StdErr/StdOut of course, but also files in different formats.

              The qt += console suggestion given earlier only works on windows.

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              • D Offline
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                d.oberkofler
                wrote on last edited by
                #14

                [quote author="Volker" date="1293097794"]On Mac OS X the debug output goes to the system logger. You can read it with the Console Application (Usually in /Applications/Utilities/Console.app).

                For your own logging facilities "qInstallMsgHandler()":http://doc.qt.nokia.com/latest/qtglobal.html#qInstallMsgHandler is your friend (that's the solution Gerolf mentioned).

                I once wrote a small GUI that collects the qXXX() messages. I can put it in the wiki on request.[/quote]

                I think it would be great if you could make your "small GUI that collects the qXXX() messages" available to everyone.

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                • V Offline
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                  vcsala
                  wrote on last edited by
                  #15

                  @Volker, that would be really nice of you.

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                  • K Offline
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                    kamalakshantv
                    wrote on last edited by
                    #16

                    [quote author="Volker" date="1293097794"]On Mac OS X the debug output goes to the system logger. You can read it with the Console Application (Usually in /Applications/Utilities/Console.app).

                    For your own logging facilities "qInstallMsgHandler()":http://doc.qt.nokia.com/latest/qtglobal.html#qInstallMsgHandler is your friend (that's the solution Gerolf mentioned).

                    I once wrote a small GUI that collects the qXXX() messages. I can put it in the wiki on request.[/quote]

                    Yes, everyone would like such a handy tool.

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                    • G Offline
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                      giesbert
                      wrote on last edited by
                      #17

                      Request :-))

                      Nokia Certified Qt Specialist.
                      Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                      • G Offline
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                        goetz
                        wrote on last edited by
                        #18

                        I've added a "wiki page":http://developer.qt.nokia.com/wiki/Browser_for_QDebug_output with the source code of the QDebug Log Output Browser.

                        I hope it is useful for somebody and of course feel free to ask, if you have questions.

                        http://www.catb.org/~esr/faqs/smart-questions.html

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                        • A Offline
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                          ashwindas
                          wrote on last edited by
                          #19

                          Thanks Volker, I was also looking for something similar :)

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                          • U Offline
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                            ucomesdag
                            wrote on last edited by
                            #20

                            [quote author="Volker" date="1294011522"]I've added a "wiki page":http://developer.qt.nokia.com/wiki/Browser_for_QDebug_output with the source code of the QDebug Log Output Browser.[/quote]

                            Thanks Volker, fiddling with it at the moment... :-)

                            Write “Qt”, not “QT” (QuickTime).

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                              goetz
                              wrote on last edited by
                              #21

                              I added the .pro file, that was missing from the first version.

                              http://www.catb.org/~esr/faqs/smart-questions.html

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                              • D Offline
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                                d.oberkofler
                                wrote on last edited by
                                #22

                                [quote author="Volker" date="1294011522"]I've added a "wiki page":http://developer.qt.nokia.com/wiki/Browser_for_QDebug_output with the source code of the QDebug Log Output Browser.
                                I hope it is useful for somebody and of course feel free to ask, if you have questions.[/quote]
                                Thank you!

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