QTranslator doesn't load .qm file

ekkescorner

just testing translations of Qt 5.6 qt.labs.controls APP for Android and iOS
trying to load the .qm files fails. Tried two ways to load - same result:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QDebug>
#include <QTranslator>

int main(int argc, char *argv[])
{
    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    qputenv("QT_LABS_CONTROLS_STYLE", "material");
    QGuiApplication app(argc, argv);
    QTranslator translator;
//    if (translator.load("one_page_ui_" + QLocale::system().name(), ":/translations")) {
//        app.installTranslator(&translator);
//    } else {
//        qDebug() << "cannot load translator " << QLocale::system().name();
//    }
    if (translator.load(QLocale(), QLatin1String("one_page_ui"), QLatin1String("_"), QLatin1String(":/translations"))) {
        app.installTranslator(&translator);
    } else {
        qDebug() << "cannot load translator " << QLocale::system().name();
    }

qm files are created by lrelease from my .pro:

# Used to embed the qm files in resources
TRANSLATIONS_FILES =

# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     qmfile = $$shadowed($$tsfile)
     qmfile ~= s,\\.ts$,.qm,
     qmdir = $$dirname(qmfile)
     !exists($$qmdir) {
         mkpath($$qmdir)|error("Aborting.")
     }
     command = $$LRELEASE -removeidentical $$tsfile -qm  $$qmfile
     system($$command)|error("Failed to run: $$command")
     TRANSLATIONS_FILES += $$qmfile
 }

looking at the build-directories for Android or iOS the .qm files are deployed here:

build-one_page_ui-Android_f_r_armeabi_v7a_GCC_4_9_Qt_5_6_0-Debug/

android-build
....
Makefile
...
translations/one_page_ui_de.qm
translations/one_page_ui.qm

is there anything wrong ?

SGaist

Hi,

Do you want to use these files from Qt's resource system or from a hard drive ? Because currently the path your are using in your translator.load call is within the resources but the build-directory note makes me think of a local deployment.

ekkescorner

@SGaist as I understood it right, using TRANSLATIONS_FILES in my .pro will make the .qm part of the resource system.
inside my project dir there are the /translations/*.ts files
build and run on Android or iOS then lrelease from my code above in .pro creates the .qm from .ts and if I take a look at the build dirs for android or ios I see the /translations/.qm files at the root of the build dir

I didn't found any hint to do additional things to have the *.qm available from android or ios

is there anything wrong ? this stuff is new to me - developing BlackBerry Cascades (Qt 4.8) apps all the translations stuff was handled by magic - I only had to define the languages.

thx for any help

BTW: this is the complete .pro:

TEMPLATE = app

QT += qml quick core
CONFIG += c++11

SOURCES += main.cpp
lupdate_only {
    SOURCES +=  main.qml \
    common/*.qml \
    demo/*.qml
}

OTHER_FILES += main.qml \
    common/*.qml \
    demo/*.qml

RESOURCES += qml.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

# var, prepend, append
 defineReplace(prependAll) {
     for(a,$$1):result += $$2$${a}$$3
     return($$result)
 }
# Supported languages
LANGUAGES = de en fr
# Available translations
TRANSLATIONS = $$PWD/translations/one_page_ui.ts
TRANSLATIONS += $$prependAll(LANGUAGES, $$PWD/translations/one_page_ui_, .ts)

# Used to embed the qm files in resources
TRANSLATIONS_FILES =

# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     qmfile = $$shadowed($$tsfile)
     qmfile ~= s,\\.ts$,.qm,
     qmdir = $$dirname(qmfile)
     !exists($$qmdir) {
         mkpath($$qmdir)|error("Aborting.")
     }
     command = $$LRELEASE -removeidentical $$tsfile -qm  $$qmfile
     system($$command)|error("Failed to run: $$command")
     TRANSLATIONS_FILES += $$qmfile
 }

SGaist

OK, I think I'm following you now.

If I understood correctly, that technique doesn't use Qt's resource system but create the files as a "resource to use by your application" i.e. it generates the files besides your application in a folder named "translations" that your should be able to access easily but not using :/ as protocol. If you want to embedded them within your executable you have to create a .qrc file for them.

ekkescorner

@SGaist thx for the hint. will try this
but then I need the .qm files in my project dir
this generates them into the build dir

# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     qmfile = $shadowed($tsfile)
     qmfile ~= s,\\.ts$,.qm,
     qmdir = $dirname(qmfile)
     !exists($qmdir) {
         mkpath($qmdir)|error("Aborting.")
     }
     command = $LRELEASE -removeidentical $tsfile -qm  $qmfile
     system($command)|error("Failed to run: $command")
     TRANSLATIONS_FILES += $qmfile
 }

any idea how to change this to get the qm files from lrelease in my project dir /translations besides the .ts ?

ekkescorner

@SGaist found it. will post later the solution. it works now using .qrc. thx

ekkescorner

@SGaist this way it runs on Android and iOS as expected:

TEMPLATE = app

QT += qml quick core
CONFIG += c++11

SOURCES += main.cpp
lupdate_only {
    SOURCES +=  main.qml \
    common/*.qml \
    demo/*.qml
}

OTHER_FILES += main.qml \
    common/*.qml \
    demo/*.qml

RESOURCES += qml.qrc \
    translations.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

# T R A N S L A T I O N S

# if languages are added:
# 1. rebuild project to generate *.qm
# 2. add existing .qm files to translations.qrc

# if changes to translatable strings:
# 1. Run Tools-External-Linguist-Update
# 2. Run Linguist and do translations
# 3. Build and run on iOS and Android to verify translations

# Supported languages
LANGUAGES = de en fr

# used to create .ts files
 defineReplace(prependAll) {
     for(a,$$1):result += $$2$${a}$$3
     return($$result)
 }
# Available translations
TRANSLATIONS = $$PWD/translations/one_page_ui.ts
TRANSLATIONS += $$prependAll(LANGUAGES, $$PWD/translations/one_page_ui_, .ts)
# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     qmfile = $$tsfile
     qmfile ~= s,\\.ts$,.qm,
     command = $$LRELEASE -removeidentical $$tsfile -qm  $$qmfile
     system($$command)|error("Failed to run: $$command")
 }

thx for helping. now I understand it better how it works
question: I'm using the app name (one_page_ui) sometimes inside .pro. Can I replace this using a variable ?

BTW: is there a way to create a .qrc and add files dynamically from inside .pro ? would be great to eliminate this manual step.

SGaist

Usually you have the application name stored in the TARGET variable that you can then re-use.

You can try to create your own custom target that you would run before the build starts.

ekkescorner

@SGaist now I added TARGET and changed creation of .ts files and reduced required code for lrelease
here's my final way to deal with .ts / .qm:

TEMPLATE = app
TARGET = one_page_ui

QT += qml quick core
CONFIG += c++11

SOURCES += main.cpp
lupdate_only {
    SOURCES +=  main.qml \
    common/*.qml \
    demo/*.qml
}

OTHER_FILES += main.qml \
    common/*.qml \
    demo/*.qml

RESOURCES += qml.qrc \
    translations.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

# T R A N S L A T I O N S

# if languages are added:
# 1. rebuild project to generate *.qm
# 2. add existing .qm files to translations.qrc

# if changes to translatable strings:
# 1. Run Tools-External-Linguist-Update
# 2. Run Linguist and do translations
# 3. Build and run on iOS and Android to verify translations

# Supported languages
LANGUAGES = de en fr

# used to create .ts files
 defineReplace(prependAll) {
     for(a,$$1):result += $$2$${a}$$3
     return($$result)
 }
# Available translations
tsroot = $$join(TARGET,,,.ts)
tstarget = $$join(TARGET,,,_)
TRANSLATIONS = $$PWD/translations/$$tsroot
TRANSLATIONS += $$prependAll(LANGUAGES, $$PWD/translations/$$tstarget, .ts)
# run LRELEASE to generate the qm files
qtPrepareTool(LRELEASE, lrelease)
 for(tsfile, TRANSLATIONS) {
     command = $$LRELEASE $$tsfile
     system($$command)|error("Failed to run: $$command")
 }

only manual step required is to run lupdate if translatable strings changed in src or qml

ekkescorner

FWIW: I have written a blog about this: http://j.mp/qt-i18n

SGaist

Thanks !