Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. how to clear QTranslator
Forum Update on Monday, May 27th 2025

how to clear QTranslator

Scheduled Pinned Locked Moved Unsolved General and Desktop
18 Posts 3 Posters 5.9k Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • VRoninV VRonin

    @literA2 said in how to clear QTranslator:

    From main.cpp, i created a translator object and installed it if it isn't English.

    Do you really need to do it? just run lupdate and lrelease to create the English translation file that will not alter any string inside tr().
    i.e. Use an untranslated .qm to make your program default to the original string

    L Offline
    L Offline
    literA2
    wrote on last edited by
    #5

    @VRonin so you still have .qm file for English, with the same key and value.

    But i have this problem removing the translator installed. I can't find any issues related to it.

    I'll give a try to create one for English. Thanks.

    1 Reply Last reply
    0
    • VRoninV Offline
      VRoninV Offline
      VRonin
      wrote on last edited by
      #6

      can you show us the code where you add and remove the translator?

      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
      ~Napoleon Bonaparte

      On a crusade to banish setIndexWidget() from the holy land of Qt

      L 1 Reply Last reply
      0
      • VRoninV VRonin

        can you show us the code where you add and remove the translator?

        L Offline
        L Offline
        literA2
        wrote on last edited by literA2
        #7

        @VRonin said in how to clear QTranslator:

        can you show us the code where you add and remove the translator?

        loadTranslator is being called also upon instantiation of the class to load the currently installed translator.

        void loadTranslator (QString language)
        {
          if (language === "German") {
            translator.load("translation_de_DE", location);
          }  else if (language === "French") {
            translator.load("translation_fr_FR", location);
          } else if (language === "Spanish") {
            translator.load("translation_es_ES", location);
          }
        }
        
        void changeLanguage(QString language)
        {
           if (!translator.isEmpty()) {
             qApp -> removeTranslator(&translator); // this returns false once there is an existing translator installed
             // if possible i wanted to clear here the translator
           }
        
           loadTranslator(language);
        
           if (!translator.isEmpty() && (language != "English")) {
             qApp -> installTranslator(&translator);
           }
         }
        
        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #8

          Are you re-creating the translator at some point ?

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

          L 1 Reply Last reply
          0
          • SGaistS SGaist

            Are you re-creating the translator at some point ?

            L Offline
            L Offline
            literA2
            wrote on last edited by
            #9

            @SGaist said in how to clear QTranslator:

            Are you re-creating the translator at some point ?

            yes, as i mentioned i have a translator from the main and created another translator from another class. In another class i loaded the file that is currently installed based on the stored language.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #10

              Then aren't you trying to remove a translator that wasn't installed in the first place ?

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

              L 1 Reply Last reply
              1
              • SGaistS SGaist

                Then aren't you trying to remove a translator that wasn't installed in the first place ?

                L Offline
                L Offline
                literA2
                wrote on last edited by
                #11

                @SGaist said in how to clear QTranslator:

                Then aren't you trying to remove a translator that wasn't installed in the first place ?

                After checking, it actually installed successfully.

                1 Reply Last reply
                0
                • VRoninV Offline
                  VRoninV Offline
                  VRonin
                  wrote on last edited by
                  #12

                  The problem is if &translator used in installTranslator is the same as &translator used in removeTranslator. where does translator live. if it's a local variable you are doing it wrong

                  "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                  ~Napoleon Bonaparte

                  On a crusade to banish setIndexWidget() from the holy land of Qt

                  L 1 Reply Last reply
                  0
                  • VRoninV VRonin

                    The problem is if &translator used in installTranslator is the same as &translator used in removeTranslator. where does translator live. if it's a local variable you are doing it wrong

                    L Offline
                    L Offline
                    literA2
                    wrote on last edited by
                    #13

                    @VRonin said in how to clear QTranslator:

                    The problem is if &translator used in installTranslator is the same as &translator used in removeTranslator. where does translator live. if it's a local variable you are doing it wrong

                    Shouldn't that be the case? if you remove the previously installed translator, that is also what you need to pass for it to uninstall?

                    The translator in other class is private.

                    1 Reply Last reply
                    0
                    • VRoninV Offline
                      VRoninV Offline
                      VRonin
                      wrote on last edited by VRonin
                      #14

                      What I mean is:

                      Wrong:

                      {
                      QTranslator translator;
                      translator.load("translation_de_DE", location);
                       qApp -> installTranslator(&translator);
                      }
                      {
                      QTranslator translator;
                       qApp -> removeTranslator(&translator);
                      }
                      

                      Right:

                      QTranslator translator;
                      {
                      translator.load("translation_de_DE", location);
                       qApp -> installTranslator(&translator);
                      }
                      {
                       qApp -> removeTranslator(&translator);
                      }
                      

                      We'd need to see where translator is declared and from where do you call those functions to help you better

                      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                      ~Napoleon Bonaparte

                      On a crusade to banish setIndexWidget() from the holy land of Qt

                      L 1 Reply Last reply
                      0
                      • VRoninV VRonin

                        What I mean is:

                        Wrong:

                        {
                        QTranslator translator;
                        translator.load("translation_de_DE", location);
                         qApp -> installTranslator(&translator);
                        }
                        {
                        QTranslator translator;
                         qApp -> removeTranslator(&translator);
                        }
                        

                        Right:

                        QTranslator translator;
                        {
                        translator.load("translation_de_DE", location);
                         qApp -> installTranslator(&translator);
                        }
                        {
                         qApp -> removeTranslator(&translator);
                        }
                        

                        We'd need to see where translator is declared and from where do you call those functions to help you better

                        L Offline
                        L Offline
                        literA2
                        wrote on last edited by literA2
                        #15

                        @VRonin osrry, it isn't declared locally on the function. I have declared the it in the header file.

                        //Settings.h
                        class Settings : public QObject {
                            QTranslator translator;
                         }
                        
                        // Settings.cpp
                        Settings::Settings(QObject *parent)
                           : QObject (parent)
                        {
                            loadTranslator(Profile::Language);
                         }
                        
                        VRoninV 1 Reply Last reply
                        0
                        • L literA2

                          @VRonin osrry, it isn't declared locally on the function. I have declared the it in the header file.

                          //Settings.h
                          class Settings : public QObject {
                              QTranslator translator;
                           }
                          
                          // Settings.cpp
                          Settings::Settings(QObject *parent)
                             : QObject (parent)
                          {
                              loadTranslator(Profile::Language);
                           }
                          
                          VRoninV Offline
                          VRoninV Offline
                          VRonin
                          wrote on last edited by VRonin
                          #16

                          @literA2 then what is the life cycle of Settings instance(s)?
                          is loadTranslator a global function?

                          "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                          ~Napoleon Bonaparte

                          On a crusade to banish setIndexWidget() from the holy land of Qt

                          L 1 Reply Last reply
                          0
                          • VRoninV VRonin

                            @literA2 then what is the life cycle of Settings instance(s)?
                            is loadTranslator a global function?

                            L Offline
                            L Offline
                            literA2
                            wrote on last edited by
                            #17

                            @VRonin loadTranslator is only a private function. Settings lifecycle is as long as the app is running.

                            1 Reply Last reply
                            0
                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #18

                              You should also check that translator.load runs successfully

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

                              1 Reply Last reply
                              0

                              • Login

                              • Login or register to search.
                              • First post
                                Last post
                              0
                              • Categories
                              • Recent
                              • Tags
                              • Popular
                              • Users
                              • Groups
                              • Search
                              • Get Qt Extensions
                              • Unsolved