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Wrong text display : Qt 5.14 only

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qmlqt 5.14text corruptioncharacter encod
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  • Christian EhrlicherC Christian Ehrlicher

    Please provide a minimal, compilable example and no screenshots from the code.

    UlysseU Offline
    UlysseU Offline
    Ulysse
    wrote on last edited by Ulysse
    #3

    @Christian-Ehrlicher I can't : my project is huge and i don't know how to reproduce the bug
    I bet things work fine if i start somethting from the bottom up, it is a pretty basic functionnality

    I should be able to turn a Qt 5.6 project into a Qt 5.14 one.
    I am not aware of every line of code related to strings in the application itself because i did not write most of it.
    In fact i would like to know what i should look for, if you have any idea

    Regards

    1 Reply Last reply
    0
    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #4

      @Ulysse said in Wrong text display : Qt 5.14 only:

      I bet things work fine if i start somethting from the bottom up, it is a pretty basic functionnality

      At least you can try to prove it - if it does not work with a simple reproducer then copy your project and remove all stuff until it no longer happens. That's the way the find bugs and why you're a programmer.

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

      UlysseU 1 Reply Last reply
      0
      • Christian EhrlicherC Christian Ehrlicher

        @Ulysse said in Wrong text display : Qt 5.14 only:

        I bet things work fine if i start somethting from the bottom up, it is a pretty basic functionnality

        At least you can try to prove it - if it does not work with a simple reproducer then copy your project and remove all stuff until it no longer happens. That's the way the find bugs and why you're a programmer.

        UlysseU Offline
        UlysseU Offline
        Ulysse
        wrote on last edited by Ulysse
        #5

        @Christian-Ehrlicher I am afraid you cannot do that when you have a 250'000 lines application.
        One has to narrow his search scope in order to solve bugs
        Thus my question : what should i look for ?
        And my that i mean particular functions calls, context, options.. anything

        Maybe you don't have any idea and that is fine, others will (even myself maybe?) and we will be able to locate the cause of the behavior
        But i won't be dismantling my whole application for obvious reasons

        Regards

        Christian EhrlicherC 1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #6

          Hi,

          Where are you loading that text from ?
          Where are you setting that text ?

          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
          1
          • UlysseU Ulysse

            TLDR :
            Font file needs to be loaded before the creation of objects that use them
            In my case :

            int main(int argc, char* argv[]){
                // [...]
                QApplication a(argc, argv);
                QFontDatabase::addApplicationFont(":/police/roboto.ttf");
                MainWindow w;
                // [...]
            }
            

            Doing the other way around can cause the bug (could not reproduce the bug in a minimal example though)


            Hi

            I have an app wich my team and I developped using Qt 5.6 and compiling it Qt 5.14 showed this weird bug :

            Untitled.png

            Text is messed up here and there

            The string is defined in the .ui file of the widget :
            886b1009-2375-4820-bfd0-6a26a245ccf4-image.png

            NB : the characters displayed seem to be of the formchar(expectedchar_asciicode - 1) :
            Show -> Rgnv

            Any idea of how i could possibly fix this ?

            Regards

            Pl45m4P Offline
            Pl45m4P Offline
            Pl45m4
            wrote on last edited by
            #7

            @Ulysse said in Wrong text display : Qt 5.14 only:

            the characters displayed seem to be of the formchar(expectedchar_asciicode - 1):
            Show -> Rgnv

            Do you convert / re-interpret or edit the string somewhere?

            Very unlikely that the issue comes from QString itself.


            If debugging is the process of removing software bugs, then programming must be the process of putting them in.

            ~E. W. Dijkstra

            1 Reply Last reply
            0
            • UlysseU Ulysse

              @Christian-Ehrlicher I am afraid you cannot do that when you have a 250'000 lines application.
              One has to narrow his search scope in order to solve bugs
              Thus my question : what should i look for ?
              And my that i mean particular functions calls, context, options.. anything

              Maybe you don't have any idea and that is fine, others will (even myself maybe?) and we will be able to locate the cause of the behavior
              But i won't be dismantling my whole application for obvious reasons

              Regards

              Christian EhrlicherC Offline
              Christian EhrlicherC Offline
              Christian Ehrlicher
              Lifetime Qt Champion
              wrote on last edited by
              #8

              @Ulysse said in Wrong text display : Qt 5.14 only:

              Thus my question : what should i look for ?

              If you want to reproduce a bug, start, as already said, with a simple reproducer. If you then can't reproduce the issue - try to isolate the problem. Since it's a simple widget I'm pretty sure you don't need to touch every 250k lines...

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

              1 Reply Last reply
              0
              • UlysseU Offline
                UlysseU Offline
                Ulysse
                wrote on last edited by Ulysse
                #9

                We use the "roboto" TrueType font.
                Commenting the QFontDatabase::addApplicationFont(":/police/roboto.ttf"); line in the main removes the problem
                Has there been any changes between Qt 5.6 and Qt 5.14 that concerns TrueType fonts, or fonts in general ?

                I can upload the font file if you need me to

                Regards

                1 Reply Last reply
                0
                • Christian EhrlicherC Offline
                  Christian EhrlicherC Offline
                  Christian Ehrlicher
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  So now that you've a point where to start - why not creating a simple reproducer??

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

                  UlysseU 1 Reply Last reply
                  0
                  • Christian EhrlicherC Christian Ehrlicher

                    So now that you've a point where to start - why not creating a simple reproducer??

                    UlysseU Offline
                    UlysseU Offline
                    Ulysse
                    wrote on last edited by Ulysse
                    #11

                    @Christian-Ehrlicher Because that is what i was doing of course
                    I was not able to reproduce it though
                    I verified and roboto is correctly used

                    #include <QMainWindow>
                    
                    QT_BEGIN_NAMESPACE
                    namespace Ui { class MainWindow; }
                    QT_END_NAMESPACE
                    
                    class MainWindow : public QMainWindow
                    {
                        Q_OBJECT
                    
                    public:
                        MainWindow(QWidget *parent = nullptr);
                        ~MainWindow();
                    
                    private:
                        Ui::MainWindow *ui;
                    };
                    
                    MainWindow::MainWindow(QWidget *parent)
                        : QMainWindow(parent)
                        , ui(new Ui::MainWindow)
                    {
                        ui->setupUi(this);
                    }
                    
                    MainWindow::~MainWindow()
                    {
                        delete ui;
                    }
                    
                    #include <QApplication>
                    #include <QFontDatabase>
                    
                    int main(int argc, char *argv[])
                    {
                        QApplication a(argc, argv);
                        MainWindow w;
                        QFontDatabase::addApplicationFont(":/police/roboto.ttf");
                        w.show();
                        return a.exec();
                    }
                    

                    mainwindow.ui :

                    <?xml version="1.0" encoding="UTF-8"?>
                    <ui version="4.0">
                     <class>MainWindow</class>
                     <widget class="QMainWindow" name="MainWindow">
                      <property name="geometry">
                       <rect>
                        <x>0</x>
                        <y>0</y>
                        <width>465</width>
                        <height>262</height>
                       </rect>
                      </property>
                      <property name="windowTitle">
                       <string>MainWindow</string>
                      </property>
                      <property name="styleSheet">
                       <string notr="true">QComboBox, QLabel, QAbstractSpinBox, QLineEdit, QTextBrowser, QRadioButton, QCheckBox
                    {
                    	font-family: &quot;Roboto Light&quot;;
                    	font-size: 40px;
                    	qproperty-alignment: AlignCenter;
                    	color: black;
                    	qproperty-contextMenuPolicy: NoContextMenu;
                    }</string>
                      </property>
                      <widget class="QWidget" name="centralwidget">
                       <layout class="QHBoxLayout" name="horizontalLayout">
                        <item>
                         <widget class="QLabel" name="label">
                          <property name="text">
                           <string>Hello World</string>
                          </property>
                         </widget>
                        </item>
                       </layout>
                      </widget>
                      <widget class="QMenuBar" name="menubar">
                       <property name="geometry">
                        <rect>
                         <x>0</x>
                         <y>0</y>
                         <width>465</width>
                         <height>25</height>
                        </rect>
                       </property>
                      </widget>
                      <widget class="QStatusBar" name="statusbar"/>
                     </widget>
                     <resources/>
                     <connections/>
                    </ui>
                    
                    1 Reply Last reply
                    0
                    • hskoglundH Offline
                      hskoglundH Offline
                      hskoglund
                      wrote on last edited by
                      #12

                      Hi, just guessing but do you get the same error if you add the font from a disk file instead of an embedded resource, say like:

                      ...
                      MainWindow w;
                      QFontDatabase::addApplicationFont("roboto.ttf");
                      w.show();
                      ...
                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #13

                        Silly idea: what if you load the font before creating your MainWindow object ?

                        Instinctively, I would setup all external resources like this one before creating objects that will use them.

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

                        UlysseU 1 Reply Last reply
                        4
                        • SGaistS SGaist

                          Silly idea: what if you load the font before creating your MainWindow object ?

                          Instinctively, I would setup all external resources like this one before creating objects that will use them.

                          UlysseU Offline
                          UlysseU Offline
                          Ulysse
                          wrote on last edited by
                          #14

                          @SGaist And we have a winner ! That was the issue, thank you :)

                          1 Reply Last reply
                          0
                          • E Offline
                            E Offline
                            es-w
                            wrote on last edited by es-w
                            #15

                            Hi,
                            I have also had the same problem as OP but my GUI is QML and platform is Android It has a problem when I move my application from Qt 5.13.2 to Qt 5.14.2.
                            So now I just strict with Qt 5.13.2 (Even I would like to use a new feature for app bundle ) but I just curious why no one has the problem with display the wrong text after the move to Qt 5.14.2.

                            I try all method as OP and also load the font in QML and set the font to all display text but some text still displays wrong text i.e. under

                            Menu {
                               title: "Languages"
                              font: Fonts.fontDefault
                            }
                            

                            from above in GUI it's show "Languages " as below
                            de144dd8-413f-4731-a67f-7ecfd99d5a26-image.png

                            Pl45m4P 1 Reply Last reply
                            0
                            • E es-w

                              Hi,
                              I have also had the same problem as OP but my GUI is QML and platform is Android It has a problem when I move my application from Qt 5.13.2 to Qt 5.14.2.
                              So now I just strict with Qt 5.13.2 (Even I would like to use a new feature for app bundle ) but I just curious why no one has the problem with display the wrong text after the move to Qt 5.14.2.

                              I try all method as OP and also load the font in QML and set the font to all display text but some text still displays wrong text i.e. under

                              Menu {
                                 title: "Languages"
                                font: Fonts.fontDefault
                              }
                              

                              from above in GUI it's show "Languages " as below
                              de144dd8-413f-4731-a67f-7ecfd99d5a26-image.png

                              Pl45m4P Offline
                              Pl45m4P Offline
                              Pl45m4
                              wrote on last edited by
                              #16

                              @es-w

                              Did you try what @SGaist suggested?


                              If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                              ~E. W. Dijkstra

                              E 1 Reply Last reply
                              0
                              • Pl45m4P Pl45m4

                                @es-w

                                Did you try what @SGaist suggested?

                                E Offline
                                E Offline
                                es-w
                                wrote on last edited by
                                #17

                                @Pl45m4 Already try it work on Windows but not for android

                                1 Reply Last reply
                                0
                                • A Offline
                                  A Offline
                                  aludwig
                                  wrote on last edited by
                                  #18

                                  @es-w Did you ever figure anything out on this? I'm having the same issue with QML in Qt 5.15.8 where some text is incorrect on the same screen as some correct text. I also explicitly set the font to Roboto prior to displaying any QML. The weird part is, is the same build works on one Red Hat VM, but does not work on a slightly different RH VM.

                                  1 Reply Last reply
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