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  4. [SOLVED] Crash error when deleting a QList< QPair<QString, QString> >
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[SOLVED] Crash error when deleting a QList< QPair<QString, QString> >

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  • M Offline
    M Offline
    maisoui
    wrote on last edited by
    #3

    Hi,

    Thank you for your reply.

    Yes, I'm using Visual Studio 2010 debugger and Yes, crash occurs when tokens are cleared (or when variable is deleted).

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    • M Offline
      M Offline
      maisoui
      wrote on last edited by
      #4

      I add that I am running Windows 7 64 bit with a "standard" build of Qt 4.8.5 (just --Zc:wchar_t-- removed from QMAKE_CFLAGS). Maybe problem comes from that?

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #5

        In that case, are you sure that getTokenUrl.queryItems() returns something that is correct ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #6

          Then you need to also check whether any other library you are linking to does follow that

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • M Offline
            M Offline
            maisoui
            wrote on last edited by
            #7

            Here is my debugger output:

            !http://s18.postimg.org/7pyw0reix/qt_bug_qlist.png(debugger output)!

            And stack trace after crash occurs:

            !http://s15.postimg.org/5u3a6oq2j/qt_bug_stack.png(stack trace)!

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #8

              Did you check that all the libraries you are using are compiled with the same wchart_t options ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • M Offline
                M Offline
                maisoui
                wrote on last edited by
                #9

                I checked multiple times and everything seems ok. My project isn't "young" and it's the first time I encounter this problem. I don't know which way to look...
                (I don't remember I have crash on Qt 4.8.0, but I need to confirm).

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  Which version of Qt are you using now ? There has been a change in the wchart_t flag, in Qt 5 it's the opposite of what was used for Qt 4

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • M Offline
                    M Offline
                    maisoui
                    wrote on last edited by
                    #11

                    I've found the problem by creating a new project and copying the parameters one by one.

                    The code below crash if I use the Runtime Library option Multi-threaded DLL (/MD) in debug mode (Qt 4.8.5, Visual Studio 2010 with platform toolset v90, 64 bit).

                    @int main(int argc, char *argv[])
                    {
                    QCoreApplication a(argc, argv);

                    QUrl getTokenUrl(QString::fromLatin1("http://localhost?hello=world"));
                    QList< QPair<QString, QString> > tokens = getTokenUrl.queryItems();
                    tokens.clear();

                    return a.exec();
                    }@

                    This option is needed by my target environment but I'll see if I can do without.

                    Maybe you have a suggestion?

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                    • M Offline
                      M Offline
                      maisoui
                      wrote on last edited by
                      #12

                      It seems it will be impossible for me to change this project settings. So I think I need to rebuild my Qt libraries with the option QMAKE_CFLAGS_DEBUG = -Zi -MD in the qmake.conf (for win32-msvc2008).
                      Thank you for your patience.
                      Regards

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #13

                        Aren't you using 2010 ?

                        Which project settings can't you changed ?

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                        • M Offline
                          M Offline
                          maisoui
                          wrote on last edited by
                          #14

                          I'm using Visual Studio 2010 with platform toolset v90 (VS2008) and v100 (VS2010), because I target multiple environement.

                          I can't change the project settings Runtime Library, it must be set on Multi-threaded DLL (/MD) (in debug/release mode).

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #15

                            Did you succeeded ?

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                            • M Offline
                              M Offline
                              maisoui
                              wrote on last edited by
                              #16

                              Yes. I rebuild Qt for (v90 - v100 / 32 and 64 bit) with MD flag for Debug and everything is ok. I forgot I had a similar problem with QPrinterInfo::availablePrinters(), and it fix this issue too.

                              Thank you for your help.
                              Regards.

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