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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
    #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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