[solved] Translation on the fly crashes

[skwateur]

Hello everyone.

I am developping an application in French and need to translate it into English aswell.
It was working fine till yesterday when I had a new idea about the way to change the language. At first I was using a menu bar to translate the application, then I wanted to do it through a new widget.

The former case worked perfectly but the latter one failed so I decided to remove it. The problem is... translation through the menu bar doesn't work anymore now.

I have a MainWindow composed of a mainWidget and this mainwidget is used to display "other" widgets by using buttons.
Anyway, here is how I implemented the translation :

@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
translator = new QTranslator(0);
QApplication::instance()->installTranslator(translator);

connect(item1, SIGNAL(triggered()), this, (SLOT(changeToFrench())));
connect(item2, SIGNAL(triggered()), this, (SLOT(changeToEnglish())));@

@void MainWindow::changeToFrench()
{
if(!translator->isEmpty())
QApplication::instance()->removeTranslator(translator);
}

void MainWindow::changeToEnglish()
{
translator->load("dcl_en",QApplication::applicationDirPath());
}@

@void MainWindow::changeEvent(QEvent *e)
{
if(e->type() == QEvent::LanguageChange)
{
ui->retranslateUi(this);
retranslateUi();
}
QMainWindow::changeEvent(e);
}

void MainWindow::retranslateUi()
{
menu1->setTitle(tr("Langue"));
menu2->setTitle(tr("A propos..."));
item4->setText(tr("Paramètres système"));
item1->setText("Français");
item2->setText("English");
item3->setText(tr("A propos..."));
}@

The translation works fine when I am in the main menu but if I wanna change the language when I am within an "other widget" (a widget called ui_identity for instance) it crashes with exit code -1073741819.

Here is the code in "ui_identity" :

@void ui_identity::changeEvent(QEvent *e)
{
if(e->type() == QEvent::LanguageChange)
{
ui->retranslateUi(this);
}
}@

Any ideas ?

[SGaist]

Hi,

What does a run trough the debugger tells you ?

Are you sure all the pointers your are using are valid ?

[skwateur]

Debugger tells me segmentation fault.
The error is related to the translation

[skwateur]

I can change the language through a setting window when I'm on the MainWindow but if I try while I'm on ui_identity wdget or some other widget it crashes...

Really have no idea why.

[skwateur]

@qApp->installTranslator(translator);@ this line causes the segmentation fault apparently..

[SGaist]

Are you sure translator is valid ?

[skwateur]

@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
translator = new QTranslator(0);@

I can translate the whole program while being on MainWindow. As soon as I go into a widget, I can no longer translate the program. It crashes :s

[SGaist]

That's in the MainWindow, how do you do it in your widget ?

[skwateur]

I emit a signal from the widget which is then caught by the main window :
WIDGET :
@void ui_sys_settings::languageToEn()
{
emit toEnglish();
}

void ui_sys_settings::languageToFr()
{
emit toFrench();
}@

MAINWINDOW :
@connect(sysSettings,SIGNAL(toEnglish()),this,SLOT(changeToEnglish()));
connect(sysSettings,SIGNAL(toFrench()),this,SLOT(changeToFrench()));

void MainWindow::changeToFrench()
{
if(!translator->isEmpty())
qApp->removeTranslator(translator);
}

void MainWindow::changeToEnglish()
{
if(!translator->isEmpty())
qApp->removeTranslator(translator);

translator->load("dcl_en",QApplication::applicationDirPath());
qApp->installTranslator(translator);

}@

[SGaist]

Are you sure you need to re-install the translator ?

[skwateur]

I only install it when I load the english language file. It is never installed otherwise

[SGaist]

Strange...
Could you post/share a minimal compilable example that shows the problem ?

[skwateur]

hmmm. post an example from my own program ?

[SGaist]

Rather the minimal code that reproduce the crash

[skwateur]

Oh. The code that produce the crash is the code I have posted above.

If I take the instruction " qApp->installTranslator(translator);" off, then it doesn't crash. But I have nothing translated lol

[SGaist]

Indeed, but with only pieces of code, I can't try to reproduce the crash.

[skwateur]

oh. Do you want the full code of the class ?

[skwateur]

Or I can send you the source files by email if you want. Maybe it could be easier for you to see what's wrong

[SGaist]

You can also use a service like "pastbin":http://pastebin.com/

[skwateur]

Should I paste all my code with pastbin SGalst ?