How to load translation for static library widget

kshegunov · 1 Oct 2016, 11:11

Hello,
Something is amiss here, let's take it from the top. You said that you get the "Failed to load a translation for QT in your local language" message, but this message is to be shown when this fails:

    myTranslator->load(*local, QLatin1String("tester"), QLatin1String("_"), QLatin1String(":/i18n"))

This particular line is in your application and tries to load an application translation, where does a static library resource come in play here? Could you tell what is the current language you're using and its iso code (you could use QLocale::language() and QLocale::languageToString), and make sure there's a matching translation file?

Kind regards.

mbnoimi · 10 Jan 2016, 11:49

@kshegunov said:

Hello,
Something is amiss here, let's take it from the top. You said that you get the "Failed to load a translation for QT in your local language" message, but this message is to be shown when this fails: myTranslator->load(*local, QLatin1String("tester"), QLatin1String("_"), QLatin1String(":/i18n"))

I didn't say that!
I said I get Failed to load translation from static library which points to myTranslator->load(":/languages/arabic") failure!

where does a static library resource come in play here?

As I mentioned above this line suppose to load translation from static library's resource

Could you tell what is the current language you're using and its iso code

English; en_US

kshegunov · 10 Jan 2016, 11:57

@mbnoimi

I didn't say that!
I said I get Failed to load translation from static library

Indeed you did, it's my mistake, sorry.

which points to myTranslator->load(":/languages/arabic") failure!

Could you verify that this file is available? For example what does QFile::exists(":/languages/arabic") return, true or false? If the file exists then the problem is with the actual loading, if the file is not found, then I guess there's a problem with the resource initialization.

Kind regards.

mbnoimi · 10 Jan 2016, 12:19

@kshegunov said:

Could you verify that this file is available? For example what does QFile::exists(":/languages/arabic") return, true or false?

I get true

If the file exists then the problem is with the actual loading, if the file is not found, then I guess there's a problem with the resource initialization.

After reviewing the project I discovered there are two "resources.qrc" the first one in the static library and the other in tester app. so I supposed this maybe makes Qt confused so I renamed one of them to a different name but unfortunately I still get same result.

mbnoimi · 1 Oct 2016, 12:18

@mrjj said:

QDirIterator it(":", QDirIterator::Subdirectories);
    while (it.hasNext()) {
        qDebug() << it.next();
    }
to have a look how the files are named in the running exe to to verify
that they are indeed under ":/i18n" and paths are as you expect.

I got this output:

Failed to load translation from static library
":/qt-project.org"
":/qt-project.org/qmime"
":/qt-project.org/qmime/freedesktop.org.xml"
":/qt-project.org/styles"
":/qt-project.org/styles/commonstyle"
":/qt-project.org/styles/commonstyle/images"
":/qt-project.org/styles/commonstyle/images/networkdrive-16.png"
":/qt-project.org/styles/commonstyle/images/networkdrive-32.png"
":/qt-project.org/styles/commonstyle/images/dvd-16.png"
":/qt-project.org/styles/commonstyle/images/cdr-16.png"
":/qt-project.org/styles/commonstyle/images/up-16.png"
":/qt-project.org/styles/commonstyle/images/up-32.png"
":/qt-project.org/styles/commonstyle/images/dvd-32.png"
":/qt-project.org/styles/commonstyle/images/cdr-32.png"
":/qt-project.org/styles/commonstyle/images/left-32.png"
":/qt-project.org/styles/commonstyle/images/stop-32.png"
":/qt-project.org/styles/commonstyle/images/file-16.png"
":/qt-project.org/styles/commonstyle/images/down-16.png"
":/qt-project.org/styles/commonstyle/images/stop-24.png"
":/qt-project.org/styles/commonstyle/images/left-16.png"
":/qt-project.org/styles/commonstyle/images/down-32.png"
":/qt-project.org/styles/commonstyle/images/file-32.png"
":/qt-project.org/styles/commonstyle/images/dirlink-32.png"
":/qt-project.org/styles/commonstyle/images/diropen-32.png"
":/qt-project.org/styles/commonstyle/images/diropen-16.png"
":/qt-project.org/styles/commonstyle/images/cleartext-16.png"
":/qt-project.org/styles/commonstyle/images/dirlink-16.png"
":/qt-project.org/styles/commonstyle/images/networkdrive-128.png"
":/qt-project.org/styles/commonstyle/images/media-volume-muted-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-cancel-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-open-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-apply-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-apply-16.png"
":/qt-project.org/styles/commonstyle/images/fonttruetype-16.png"
":/qt-project.org/styles/commonstyle/images/newdirectory-128.png"
":/qt-project.org/styles/commonstyle/images/filecontents-128.png"
":/qt-project.org/styles/commonstyle/images/floppy-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-delete-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-delete-32.png"
":/qt-project.org/styles/commonstyle/images/harddrive-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-clear-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-close-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-clear-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-close-16.png"
":/qt-project.org/styles/commonstyle/images/dirclosed-128.png"
":/qt-project.org/styles/commonstyle/images/trash-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-apply-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-yes-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-yes-32.png"
":/qt-project.org/styles/commonstyle/images/fontbitmap-16.png"
":/qt-project.org/styles/commonstyle/images/newdirectory-32.png"
":/qt-project.org/styles/commonstyle/images/dirclosed-32.png"
":/qt-project.org/styles/commonstyle/images/newdirectory-16.png"
":/qt-project.org/styles/commonstyle/images/dirclosed-16.png"
":/qt-project.org/styles/commonstyle/images/up-128.png"
":/qt-project.org/styles/commonstyle/images/media-pause-32.png"
":/qt-project.org/styles/commonstyle/images/media-pause-16.png"
":/qt-project.org/styles/commonstyle/images/cdr-128.png"
":/qt-project.org/styles/commonstyle/images/dvd-128.png"
":/qt-project.org/styles/commonstyle/images/media-volume-16.png"
":/qt-project.org/styles/commonstyle/images/harddrive-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-cancel-16.png"
":/qt-project.org/styles/commonstyle/images/harddrive-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-closetab-hover-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-cancel-32.png"
":/qt-project.org/styles/commonstyle/images/viewdetailed-128.png"
":/qt-project.org/styles/commonstyle/images/fusion_groupbox.png"
":/qt-project.org/styles/commonstyle/images/right-128.png"
":/qt-project.org/styles/commonstyle/images/fileinfo-16.png"
":/qt-project.org/styles/commonstyle/images/filelink-16.png"
":/qt-project.org/styles/commonstyle/images/filelink-32.png"
":/qt-project.org/styles/commonstyle/images/fileinfo-32.png"
":/qt-project.org/styles/commonstyle/images/dirlink-128.png"
":/qt-project.org/styles/commonstyle/images/media-seek-forward-16.png"
":/qt-project.org/styles/commonstyle/images/media-seek-forward-32.png"
":/qt-project.org/styles/commonstyle/images/diropen-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-help-128.png"
":/qt-project.org/styles/commonstyle/images/viewdetailed-16.png"
":/qt-project.org/styles/commonstyle/images/viewdetailed-32.png"
":/qt-project.org/styles/commonstyle/images/media-seek-backward-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-ok-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-no-128.png"
":/qt-project.org/styles/commonstyle/images/media-seek-backward-32.png"
":/qt-project.org/styles/commonstyle/images/refresh-32.png"
":/qt-project.org/styles/commonstyle/images/refresh-24.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-save-128.png"
":/qt-project.org/styles/commonstyle/images/viewlist-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-yes-128.png"
":/qt-project.org/styles/commonstyle/images/computer-32.png"
":/qt-project.org/styles/commonstyle/images/computer-16.png"
":/qt-project.org/styles/commonstyle/images/parentdir-32.png"
":/qt-project.org/styles/commonstyle/images/parentdir-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-closetab-16.png"
":/qt-project.org/styles/commonstyle/images/media-play-16.png"
":/qt-project.org/styles/commonstyle/images/desktop-16.png"
":/qt-project.org/styles/commonstyle/images/media-stop-16.png"
":/qt-project.org/styles/commonstyle/images/desktop-32.png"
":/qt-project.org/styles/commonstyle/images/media-play-32.png"
":/qt-project.org/styles/commonstyle/images/down-128.png"
":/qt-project.org/styles/commonstyle/images/media-stop-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-delete-128.png"
":/qt-project.org/styles/commonstyle/images/media-skip-backward-32.png"
":/qt-project.org/styles/commonstyle/images/media-skip-backward-16.png"
":/qt-project.org/styles/commonstyle/images/fusion_arrow.png"
":/qt-project.org/styles/commonstyle/images/viewlist-16.png"
":/qt-project.org/styles/commonstyle/images/viewlist-32.png"
":/qt-project.org/styles/commonstyle/images/file-128.png"
":/qt-project.org/styles/commonstyle/images/floppy-32.png"
":/qt-project.org/styles/commonstyle/images/left-128.png"
":/qt-project.org/styles/commonstyle/images/floppy-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-no-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-ok-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-no-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-ok-16.png"
":/qt-project.org/styles/commonstyle/images/media-skip-forward-32.png"
":/qt-project.org/styles/commonstyle/images/media-skip-forward-16.png"
":/qt-project.org/styles/commonstyle/images/filelink-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-open-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-open-32.png"
":/qt-project.org/styles/commonstyle/images/fileinfo-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-help-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-help-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-save-16.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-save-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-closetab-down-16.png"
":/qt-project.org/styles/commonstyle/images/parentdir-128.png"
":/qt-project.org/styles/commonstyle/images/filecontents-32.png"
":/qt-project.org/styles/commonstyle/images/trash-32.png"
":/qt-project.org/styles/commonstyle/images/filecontents-16.png"
":/qt-project.org/styles/commonstyle/images/trash-16.png"
":/qt-project.org/styles/commonstyle/images/right-16.png"
":/qt-project.org/styles/commonstyle/images/right-32.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-clear-128.png"
":/qt-project.org/styles/commonstyle/images/standardbutton-close-128.png"
":/qt-project.org/styles/macstyle"
":/qt-project.org/styles/macstyle/images"
":/qt-project.org/styles/macstyle/images/toolbar-ext.png"
":/qt-project.org/styles/macstyle/images/dockdock-down-16.png"
":/qt-project.org/styles/macstyle/images/closedock-16.png"
":/qt-project.org/styles/macstyle/images/dockdock-16.png"
":/qt-project.org/styles/macstyle/images/closedock-down-16.png"
":/qt-project.org/styles/macstyle/images/toolbar-ext@2x.png"
":/qt-project.org/qmessagebox"
":/qt-project.org/qmessagebox/images"
":/qt-project.org/qmessagebox/images/qtlogo-64.png"
":/i18n"
":/i18n/tester_ar.qm"
":/i18n/tester_de.qm"
":/i18n/tester_fr.qm"
":/i18n/tester_en.qm"
":/i18n/tester_ru.qm"
":/i18n/tester_it.qm"
":/languages"
":/languages/i18n"
":/languages/i18n/WidgetKeyboard_fr.qm"
":/languages/i18n/WidgetKeyboard_ar.qm"
":/languages/i18n/WidgetKeyboard_de.qm"
":/languages/i18n/WidgetKeyboard_en.qm"
":/languages/i18n/WidgetKeyboard_it.qm"
":/languages/i18n/WidgetKeyboard_ru.qm"
":/images"
":/images/cut"
":/images/copy"
":/images/logo"
":/images/paste"
":/images/normalEcho"
":/images/passwdEcho"
":/sounds"
":/sounds/click.wav"
QSoundEffect(pulseaudio): Error decoding source

kshegunov · 10 Jan 2016, 12:24

@mbnoimi
What about loading like this:

    translator->load("arabic", ":/languages");

And as a second suggestion: I think you should create another QTranslator object for the second translation file.

Kind regards.

mbnoimi · 1 Oct 2016, 12:24

@kshegunov said:

And as a second suggestion: I think you should create another QTranslator object for the second translation file.

Thanks. This fixed Tester app. problem but it didn't fix the main problem (loading translation from static library) I still get this error message:

Failed to load translation from static library

kshegunov · 10 Jan 2016, 12:29

@mbnoimi
And have you tried the loading like this translator->load("arabic", ":/languages");, since you didn't comment on that?

mbnoimi · wrote on 10 Jan 2016, 12:29

@kshegunov said:

@mbnoimi
And have you tried the loading like this translator->load("arabic", ":/languages");, since you didn't comment on that?

Didn't work :( I get same error message

mrjj · wrote on 10 Jan 2016, 12:35

Can I ask some silly maybe ?
The list shows
:/i18n/tester_ar.qm

There is no "arabic" under languages
there is
":/languages/i18n/WidgetKeyboard_ar.qm"

mbnoimi · 1 Oct 2016, 12:39

@kshegunov said:

And have you tried the loading like this translator->load("arabic", ":/languages");, since you didn't comment on that?

I tried to use translator->load(":/languages/i18n/WidgetKeyboard_ar") instead. The error message disappeared ("Failed to load translation from static library") but the widget comes from the static library still appears in English!

mrjj · 10 Jan 2016, 13:02

Silly question number 2.
The test calls ui->retranslateUi(this);
void Tester::changeEvent(QEvent *event)
{
if (event->type() == QEvent::LanguageChange) {
ui->retranslateUi(this);
} else
QWidget::changeEvent(event);
}
But tester ui->retranslate() knows about the widgets from the library ?
retranslateUi() just call all ->setText for elements inserted on the UI.
How can it know about widgets in the Lib?
Who calls widget_in_lib->setText?

mbnoimi · 10 Jan 2016, 13:11

@mrjj said:

But tester ui->retranslate() knows about the widgets from the library ?
retranslateUi() just call all ->setText for elements inserted on the UI.
How can it know about widgets in the Lib?
Who calls widget_in_lib->setText?

Fair point. But as you can see from the code the widget in static library built manually not by using Qt Designer so retranslate doesn't exist and I don't know how to create an alternative to it :(

mrjj · 1 Oct 2016, 13:17

@mbnoimi
well for dynamic translation, meaning load translation AFTER keyboard been created would be to call
void WidgetKeyBoard::createKeyboard(void) again.
As it seems to be the only place with tr(text);
retranslateUi() is very simple in all programs. it simply just sets the texts again
and the tr function gets the new text from the active translation.
Alternatively you need enum all widgets (in keyboard), get the text and re-set it via tr / directly look up trans text.
But it can be messy if many types of Widgets as then u need to handle the "setText" for each.

mbnoimi · M mrjj 10 Jan 2016, 13:11

@mrjj said:

@mbnoimi
well for dynamic translation, meaning load translation AFTER keyboard been created would be to call
void WidgetKeyBoard::createKeyboard(void) again.

I tried to call createKeyboard() once again as following but still gives same result although this function calls tr() so it suppose to do what you talked about!

void Tester::changeEvent(QEvent *event)
{
    if (event->type() == QEvent::LanguageChange) {
        ui->retranslateUi(this);
        myKeyboard->createKeyboard();
    } else
        QWidget::changeEvent(event);
}

mrjj · 1 Oct 2016, 14:51

Hi
Maybe you can
delete myKeyboard;
myKeyboard = new Keyboard(this);
as im not sure if calling createKeyboard() for same instance is 100% ok. (did not try it)

Then there is the context thing.
for mainwindow, its "mainwindow" (doh), but I do wonder about the translation that comes from static.

Since they are linked into "main", I assume its context is the same as main (tester) but if the
qm is different, it will not work.

So open them (qms) in Linguist and check the context they were extracted as.

then try with
http://doc.qt.io/qt-5/qcoreapplication.html#translate

To test a translation with that context and see if it does resolve.

First then I would worry about tr working in createKeyboard()

If I may say so.

update:
Context is "WidgetKeyBoard"
So calling createKeyboard() should be in the right context as we are in that class.

So testing with qcoreapplication.html#translate
to see if all is loaded and happy.

mbnoimi · 19 Jan 2016, 13:14

Thank you guys, I'm no longer work on this project since Digia announcement.

mrjj · wrote on 19 Jan 2016, 13:14

@mbnoimi
Ok, why if I can ask?