How to load translation for static library widget

mbnoimi · 1 Jul 2016, 11:38

Hi,

I've two sub-projects the first one is a widget built as static library while the second is an application uses that library.

THE PROBLEM: I don't know how to load translation for the used widget... May I get some help from you?

WidgetKeyboard.pro

TARGET = WidgetKeyboard
TEMPLATE = lib
CONFIG += staticlib
DESTDIR = bin

greaterThan(QT_MAJOR_VERSION, 4) {
    QT += widgets multimedia
}

unix {
    target.path = /usr/lib
    INSTALLS += target
}

SOURCES += \
    widgetkeyboard.cpp \
    qkeypushbutton.cpp

HEADERS += \
    qkeypushbutton.h \
    widgetkeyboard.h

TRANSLATIONS += \
    i18n/WidgetKeyboard_ar.ts \
    i18n/WidgetKeyboard_de.ts \
    i18n/WidgetKeyboard_en.ts \
    i18n/WidgetKeyboard_fr.ts \
    i18n/WidgetKeyboard_it.ts \
    i18n/WidgetKeyboard_ru.ts

RESOURCES += \
    languages.qrc \
    resources.qrc

OTHER_FILES += \
    i18n/*.ts

Tester.pro

TARGET = Tester
TEMPLATE = app

INCLUDEPATH += ../WidgetKeyboard
LIBS += -L../WidgetKeyboard/bin -lWidgetKeyboard

greaterThan(QT_MAJOR_VERSION, 4) {
    QT += widgets multimedia
}

SOURCES += main.cpp \
    tester.cpp \
    examplemyfocus.cpp

HEADERS += tester.h \
    examplemyfocus.h

FORMS += tester.ui

TRANSLATIONS += \
    i18n/tester_it.ts \
    i18n/tester_ru.ts \
    i18n/tester_en.ts \
    i18n/tester_de.ts \
    i18n/tester_fr.ts \
    i18n/tester_ar.ts

OTHER_FILES += \
    i18n/*.ts

RESOURCES += \
    resources.qrc

I load the translation using this snippet:

void Tester::on_listWidget_itemClicked(QListWidgetItem *item)
{
    QLocale             *local;
    QString             newLang = item->text();

    if (newLang == "French")
        local = new QLocale(QLocale::French);
    else if (newLang == "Russian")
        local = new QLocale(QLocale::Russian);
    else if (newLang == "German")
        local = new QLocale(QLocale::German);
    else if (newLang == "Italian")
        local = new QLocale(QLocale::Italian);
    else if (newLang == "English")
        local = new QLocale(QLocale::English);
    else if (newLang == "Arabic")
        local = new QLocale(QLocale::Arabic);
    else
        local = new QLocale();
    //FIXME Unable to load translation for WidgetKeyboard!
    if (myTranslator->load(*local, QLatin1String("tester"), QLatin1String("_"), QLatin1String(":/i18n")))
        qApp->installTranslator(myTranslator);
    else
        qDebug("Failed to load a translation for QT in your local language");
}

You can get full source code from here: https://github.com/mbnoimi/VirtualKeyboard

AlterX · 7 Jan 2016, 13:29

@mbnoimi

hi,
theoretically if your lib is static (e.g. *.a or *.lib in win) that will be linked alongside the application that is using the lib.
Then, just use QApplication::translate(...) with the correct context and it will work.

mbnoimi · A AlterX 7 Jan 2016, 12:16

@AlterX

theoretically if your lib is static (e.g. *.a or *.lib in win) that will be linked alongside the application that is using the lib.
Then, just use QApplication::translate(...) with the correct context and it will work.

Thanks, but this is not related to my question!
I already successfully created translation for the library but I don't know how to load it when I call the widget

SGaist · 9 Jan 2016, 10:51

Hi,

You can use QTranslator like shown in the documentation. The fact that you don't do it in main is irrelevant. The only thing that you must ensure is that your widgets handle dynamic translation properly.

mbnoimi · 9 Jan 2016, 13:24

@SGaist said:

You can use QTranslator like shown in the documentation. The fact that you don't do it in main is irrelevant. The only thing that you must ensure is that your widgets handle dynamic translation properly.

I didn't mention calling from main() !

My question is quite simple. How can I load *.qm from static library resource? as you can see below I can load *.qm easily from current project resource by using ":/"

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

I aim to load translation from static library to be able to apply multiple translations as mentioned in QTranslator doc

mrjj · 10 Jan 2016, 12:17

Hi
Maybe try

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.

kshegunov · wrote on 9 Jan 2016, 13:24

@mbnoimi

My question is quite simple. How can I load *.qm from static library resource? as you can see below I can load *.qm easily from current project resource by using ":/"

You're asking the wrong question. Actually @SGaist and @AlterX have provided valuable feedback and you'd be wise to take it into account. I peeked into your repository and I'm pretty sure you're creating your translator wrongly. Did you notice this warning: "Note that the translator must be created before the application's widgets." in the documentation?

Kind regards.

SGaist · 9 Jan 2016, 22:10

To add to @kshegunov , the note concerns the use of QTranslator shown in the example i.e. setup of the language at application startup and no support of dynamic translations.

kshegunov · S SGaist 9 Jan 2016, 20:50

@SGaist
Oh, yes, you're surely correct I forgot to check for the changeEvent() override in his code :S Still I don't see anything wrong with the translation loading by itselt.

mbnoimi · 10 Jan 2016, 10:46

@SGaist said:

To add to @kshegunov , the note concerns the use of QTranslator shown in the example i.e. setup of the language at application startup and no support of dynamic translations.

How the application doesn't support dynamic translations? Take a look into this line it calls changeEvent and if you run the app. you'll find that Tester loads the translations dynamically correctly while it doesn't call translations for static library widget because I don't know how to do it!

mbnoimi · 1 Oct 2016, 11:02

I tried to use Q_INIT_RESOURCE as mentioned in this line but unfortunately it makes things worst.

kshegunov · 1 Oct 2016, 10:52

@mbnoimi

How the application doesn't support dynamic translations?

He was referring to the note in the documentation I was citing, and was explaining that it is only relevant when there is no support for dynamic translation.

it doesn't call translations for static library widget because I don't know how to do it!

You do it, like you're doing it now. Here's the thing, a static library is nothing more then a bunch of .obj files put together. Linking a static library just includes them into your application's binary. This means, that there is nothing different between widgets that come from a static library and these declared in your application (see @AlterX's comment, he mentioned that). That's why I said you're asking the wrong question. Your translation loading looks perfectly fine to me, and it has nothing to do with static or dynamic libraries - you need to look elsewhere to solve the problem. Do you have any output in the creator's windows that might suggest your translation is not loaded? Do you get the "Failed to load a translation for QT in your local language" message printed?

I tried to use Q_INIT_RESOURCE as mentioned in this line but unfortunately it makes things worst.

Yes you should do that for all the resources in your static library. But according to this it should be placed in the beginning of main().

Kind regards.

mbnoimi · wrote on 10 Jan 2016, 10:52

@kshegunov

Do you have any output in the creator's windows that might suggest your translation is not loaded?

No

Do you get the "Failed to load a translation for QT in your local language" message printed?

No. I get Failed to load translation from static library error message!

mbnoimi · 10 Jan 2016, 11:10

@kshegunov said:

according to this it should be placed in the beginning of main().

I did that... still get same behavior.

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"
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":/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.

How to load translation for static library widget

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