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

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

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi and welcome to devnet,

    Just to rule out the obvious: are you sure the crash happen when clearing tokens ?

    Did you run your application through with the debugger ?

    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
      #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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