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cannot convert ‘const QString’ to ‘const QLocale&’

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  • Chris KawaC Chris Kawa

    @xavierbaez The error message says exactly what's wrong - you're passing a QString to where a QLocale is expected. Yes, a lot of people experience this problem with different types. The fix is always the same. Provide an argument of type that is expected.
    As Christian said - we can't tell you anything else without you showing the code that exhibits this error.

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    xavierbaez
    wrote on last edited by
    #6

    @Chris-Kawa okay thanks maybe I forgot to mention this worked and compiled and built fine with Qt5, so I guess the question 🙋🏻‍♂️ is more with “why would it work on Qt5 and not in Qt6”

    Christian EhrlicherC JonBJ jsulmJ 3 Replies Last reply
    0
    • X xavierbaez

      @Chris-Kawa okay thanks maybe I forgot to mention this worked and compiled and built fine with Qt5, so I guess the question 🙋🏻‍♂️ is more with “why would it work on Qt5 and not in Qt6”

      Christian EhrlicherC Online
      Christian EhrlicherC Online
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #7

      @xavierbaez Again: provide some code where it happens!

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      • X xavierbaez

        @Chris-Kawa okay thanks maybe I forgot to mention this worked and compiled and built fine with Qt5, so I guess the question 🙋🏻‍♂️ is more with “why would it work on Qt5 and not in Qt6”

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #8

        @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

        “why would it work on Qt5 and not in Qt6”

        Maybe because a function which took a QString in Qt5 was changed to require a QLocale& in Qt6?

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        • X xavierbaez

          @Chris-Kawa okay thanks maybe I forgot to mention this worked and compiled and built fine with Qt5, so I guess the question 🙋🏻‍♂️ is more with “why would it work on Qt5 and not in Qt6”

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #9

          @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

          why would it work on Qt5 and not in Qt6

          Because there were changes between Qt5 and Qt6, but as long as you refuse to show the code causing this error we can only guess...

          https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • jsulmJ jsulm

            @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

            why would it work on Qt5 and not in Qt6

            Because there were changes between Qt5 and Qt6, but as long as you refuse to show the code causing this error we can only guess...

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            xavierbaez
            wrote on last edited by
            #10

            @jsulm here’s the code

            
            bool BasicLogger::match(QString logFileName) const
            
            
            jsulmJ JonBJ 2 Replies Last reply
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            • X xavierbaez

              @jsulm here’s the code

              
              bool BasicLogger::match(QString logFileName) const
              
              
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              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #11

              @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

              here’s the code

              No, this is not the code causing that error...

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • X xavierbaez

                @jsulm here’s the code

                
                bool BasicLogger::match(QString logFileName) const
                
                
                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #12

                @xavierbaez
                Nobody can answer from this without knowing what class BasicLogger is, since it's not a supplied Qt class, and hence the definition of match() if you are overriding it (or perhaps some other context)? You are amazingly "economical" with what you show in order to answer your question, I cannot understand why. In itself there is nothing you show which would error requiring QLocale instead of the QString you specify.

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                • JonBJ JonB

                  @xavierbaez
                  Nobody can answer from this without knowing what class BasicLogger is, since it's not a supplied Qt class, and hence the definition of match() if you are overriding it (or perhaps some other context)? You are amazingly "economical" with what you show in order to answer your question, I cannot understand why. In itself there is nothing you show which would error requiring QLocale instead of the QString you specify.

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                  xavierbaez
                  wrote on last edited by xavierbaez
                  #13

                  @JonB

                  bool BasicLogger::match(QString logFileName) const
                  {
                      QRegExp re(QString(matchPattern).arg(_params.fileName));
                      return re.exactMatch(logFileName);
                  }
                  
                  Christian EhrlicherC JonBJ 2 Replies Last reply
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                  • X xavierbaez

                    @JonB

                    bool BasicLogger::match(QString logFileName) const
                    {
                        QRegExp re(QString(matchPattern).arg(_params.fileName));
                        return re.exactMatch(logFileName);
                    }
                    
                    Christian EhrlicherC Online
                    Christian EhrlicherC Online
                    Christian Ehrlicher
                    Lifetime Qt Champion
                    wrote on last edited by
                    #14

                    @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

                    QRegExp

                    This was deprecated in Qt5 and removed in Qt6 so I would be surprised if this compiles at all.

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                    • Christian EhrlicherC Christian Ehrlicher

                      @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

                      QRegExp

                      This was deprecated in Qt5 and removed in Qt6 so I would be surprised if this compiles at all.

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                      xavierbaez
                      wrote on last edited by
                      #15

                      @Christian-Ehrlicher said in cannot convert ‘const QString’ to ‘const QLocale&’:

                      @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

                      QRegExp

                      This was deprecated in Qt5 and removed in Qt6 so I would be surprised if this compiles at all.

                      Would you be so kind to let me know how would you write this?

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                      • X xavierbaez

                        @JonB

                        bool BasicLogger::match(QString logFileName) const
                        {
                            QRegExp re(QString(matchPattern).arg(_params.fileName));
                            return re.exactMatch(logFileName);
                        }
                        
                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by JonB
                        #16

                        @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

                        QRegExp re(QString(matchPattern).arg(_params.fileName));
                        return re.exactMatch(logFileName);
                        

                        Try (untested)

                        QRegularExpression re(QRegularExpression::anchoredPattern(QString(matchPattern).arg(_params.fileName)));
                        return re.match(logFileName).hasMatch();
                        

                        You will need to change #include <QRegExp> to #include <QRegularExpression>.

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                        • V Offline
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                          Volker75
                          wrote on last edited by Volker75
                          #17

                          Hallo,

                          i got the same problem converting from Qt 5 to Qt 6. I understand the problem, but i don't know how to fix it.
                          In my source it is this:

                          app.installTranslator(&TTranslator);                    //this is fine
                          QLocale::setDefault(TSettings->language);     //this is wrong
                          

                          While TSettings->language is a QString reading from QSettings.

                          Chris KawaC 1 Reply Last reply
                          0
                          • V Volker75

                            Hallo,

                            i got the same problem converting from Qt 5 to Qt 6. I understand the problem, but i don't know how to fix it.
                            In my source it is this:

                            app.installTranslator(&TTranslator);                    //this is fine
                            QLocale::setDefault(TSettings->language);     //this is wrong
                            

                            While TSettings->language is a QString reading from QSettings.

                            Chris KawaC Offline
                            Chris KawaC Offline
                            Chris Kawa
                            Lifetime Qt Champion
                            wrote on last edited by
                            #18

                            @Volker75 QLocale(const QString&) constructor was marked explicit in Qt6, so you have to, well, be explicit when you use that constructor :)

                            QLocale::setDefault(QLocale(TSettings->language));
                            
                            V 1 Reply Last reply
                            3
                            • Chris KawaC Chris Kawa

                              @Volker75 QLocale(const QString&) constructor was marked explicit in Qt6, so you have to, well, be explicit when you use that constructor :)

                              QLocale::setDefault(QLocale(TSettings->language));
                              
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                              Volker75
                              wrote on last edited by
                              #19

                              @Chris-Kawa said in cannot convert ‘const QString’ to ‘const QLocale&’:

                              QLocale(

                              ah... so easy.. Thank you very much! I just tried and it can compile now that file. (Not the whole project yet, there are more errors, but i hope i can fix them myself)

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                              • JonBJ JonB

                                @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

                                QRegExp re(QString(matchPattern).arg(_params.fileName));
                                return re.exactMatch(logFileName);
                                

                                Try (untested)

                                QRegularExpression re(QRegularExpression::anchoredPattern(QString(matchPattern).arg(_params.fileName)));
                                return re.match(logFileName).hasMatch();
                                

                                You will need to change #include <QRegExp> to #include <QRegularExpression>.

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                                xavierbaez
                                wrote on last edited by
                                #20

                                @JonB said in cannot convert ‘const QString’ to ‘const QLocale&’:

                                @xavierbaez said in cannot convert ‘const QString’ to ‘const QLocale&’:

                                QRegExp re(QString(matchPattern).arg(_params.fileName));
                                return re.exactMatch(logFileName);
                                

                                Try (untested)

                                QRegularExpression re(QRegularExpression::anchoredPattern(QString(matchPattern).arg(_params.fileName)));
                                return re.match(logFileName).hasMatch();
                                

                                You will need to change #include <QRegExp> to #include <QRegularExpression>.

                                Yeah that worked thank you so much.

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