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

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  • X Offline
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    xavierbaez
    wrote on 31 Mar 2023, 06:37 last edited by
    #1

    Hello. This error is affecting building an application and it’s affecting other files in the stacktrace. Have anybody experienced a similar problem? Hopefully with QStringnand QLocale&

    I’m upgrading an application from Qt5 to Qt6.

    Thanks

    C 1 Reply Last reply 31 Mar 2023, 06:44
    0
    • X xavierbaez
      31 Mar 2023, 06:37

      Hello. This error is affecting building an application and it’s affecting other files in the stacktrace. Have anybody experienced a similar problem? Hopefully with QStringnand QLocale&

      I’m upgrading an application from Qt5 to Qt6.

      Thanks

      C Offline
      C Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on 31 Mar 2023, 06:44 last edited by
      #2

      @xavierbaez Please re-read your question and ask yourself how we should help here.

      Provide some code where you've problems with.

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

      X 1 Reply Last reply 31 Mar 2023, 07:01
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      • C Christian Ehrlicher
        31 Mar 2023, 06:44

        @xavierbaez Please re-read your question and ask yourself how we should help here.

        Provide some code where you've problems with.

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        xavierbaez
        wrote on 31 Mar 2023, 07:01 last edited by
        #3

        @Christian-Ehrlicher I think I asked the question correctly

        J C 2 Replies Last reply 31 Mar 2023, 07:03
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        • X xavierbaez
          31 Mar 2023, 07:01

          @Christian-Ehrlicher I think I asked the question correctly

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          jsulm
          Lifetime Qt Champion
          wrote on 31 Mar 2023, 07:03 last edited by
          #4

          @xavierbaez Really?!
          You do not even show the code which is causing this error - how should anybody help you?!

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

          1 Reply Last reply
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          • X xavierbaez
            31 Mar 2023, 07:01

            @Christian-Ehrlicher I think I asked the question correctly

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            Chris Kawa
            Lifetime Qt Champion
            wrote on 31 Mar 2023, 07:04 last edited by Chris Kawa
            #5

            @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.

            X 1 Reply Last reply 31 Mar 2023, 07:21
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            • C Chris Kawa
              31 Mar 2023, 07:04

              @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 31 Mar 2023, 07:21 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”

              C J J 3 Replies Last reply 31 Mar 2023, 07:21
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              • X xavierbaez
                31 Mar 2023, 07:21

                @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”

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                Christian Ehrlicher
                Lifetime Qt Champion
                wrote on 31 Mar 2023, 07:21 last edited by
                #7

                @xavierbaez Again: provide some code where it happens!

                Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                Visit the Qt Academy at https://academy.qt.io/catalog

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                • X xavierbaez
                  31 Mar 2023, 07:21

                  @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”

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                  JonB
                  wrote on 31 Mar 2023, 07:38 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?

                  1 Reply Last reply
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                  • X xavierbaez
                    31 Mar 2023, 07:21

                    @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”

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                    jsulm
                    Lifetime Qt Champion
                    wrote on 31 Mar 2023, 07:39 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

                    X 1 Reply Last reply 31 Mar 2023, 08:47
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                    • J jsulm
                      31 Mar 2023, 07:39

                      @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 31 Mar 2023, 08:47 last edited by
                      #10

                      @jsulm here’s the code

                      
                      bool BasicLogger::match(QString logFileName) const
                      
                      
                      J J 2 Replies Last reply 31 Mar 2023, 08:49
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                      • X xavierbaez
                        31 Mar 2023, 08:47

                        @jsulm here’s the code

                        
                        bool BasicLogger::match(QString logFileName) const
                        
                        
                        J Offline
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                        jsulm
                        Lifetime Qt Champion
                        wrote on 31 Mar 2023, 08:49 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

                        1 Reply Last reply
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                        • X xavierbaez
                          31 Mar 2023, 08:47

                          @jsulm here’s the code

                          
                          bool BasicLogger::match(QString logFileName) const
                          
                          
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                          JonB
                          wrote on 31 Mar 2023, 08:50 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.

                          X 1 Reply Last reply 31 Mar 2023, 15:55
                          0
                          • J JonB
                            31 Mar 2023, 08:50

                            @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 31 Mar 2023, 15:55 last edited by xavierbaez
                            #13

                            @JonB

                            bool BasicLogger::match(QString logFileName) const
                            {
                                QRegExp re(QString(matchPattern).arg(_params.fileName));
                                return re.exactMatch(logFileName);
                            }
                            
                            C J 2 Replies Last reply 31 Mar 2023, 16:31
                            0
                            • X xavierbaez
                              31 Mar 2023, 15:55

                              @JonB

                              bool BasicLogger::match(QString logFileName) const
                              {
                                  QRegExp re(QString(matchPattern).arg(_params.fileName));
                                  return re.exactMatch(logFileName);
                              }
                              
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                              Christian Ehrlicher
                              Lifetime Qt Champion
                              wrote on 31 Mar 2023, 16:31 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.

                              Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                              Visit the Qt Academy at https://academy.qt.io/catalog

                              X 1 Reply Last reply 31 Mar 2023, 16:44
                              0
                              • C Christian Ehrlicher
                                31 Mar 2023, 16:31

                                @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 31 Mar 2023, 16:44 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?

                                1 Reply Last reply
                                0
                                • X xavierbaez
                                  31 Mar 2023, 15:55

                                  @JonB

                                  bool BasicLogger::match(QString logFileName) const
                                  {
                                      QRegExp re(QString(matchPattern).arg(_params.fileName));
                                      return re.exactMatch(logFileName);
                                  }
                                  
                                  J Offline
                                  J Offline
                                  JonB
                                  wrote on 31 Mar 2023, 17:43 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>.

                                  X 1 Reply Last reply 6 Apr 2023, 05:12
                                  1
                                  • V Offline
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                                    Volker75
                                    wrote on 3 Apr 2023, 17:05 last edited by Volker75 4 Mar 2023, 17:12
                                    #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.

                                    C 1 Reply Last reply 3 Apr 2023, 17:15
                                    0
                                    • V Volker75
                                      3 Apr 2023, 17:05

                                      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.

                                      C Offline
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                                      Chris Kawa
                                      Lifetime Qt Champion
                                      wrote on 3 Apr 2023, 17:15 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 Apr 2023, 17:28
                                      3
                                      • C Chris Kawa
                                        3 Apr 2023, 17:15

                                        @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 3 Apr 2023, 17:28 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)

                                        1 Reply Last reply
                                        0
                                        • J JonB
                                          31 Mar 2023, 17:43

                                          @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 6 Apr 2023, 05:12 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.

                                          1 Reply Last reply
                                          0
                                          • X xavierbaez has marked this topic as solved on 6 Apr 2023, 05:30

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                                          31 Mar 2023, 06:37

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