Internationalization with Qt

[vermarajeev]

Hi guys,
I'm working with a sample program, where I need to make my application translated to other language other than English. I went through Qt linguist manual and followed the steps for translation.

Can you guys tell me why m not able to convert the english text to french
Here is my sample program

--------------------------------------------------------------------------------------------------
//myfile.h
 
class ArrowPad : public QWidget
{
	Q_OBJECT
public:
	ArrowPad(QWidget *parent=0, const char *name="ArrowPad" );
	~ArrowPad(){}
private:
	 QPushButton* up;
	 QPushButton* left;
	 QPushButton* right;
	 QPushButton* down;
};
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
	MainWindow(QWidget *parent=0, const char *name="MainWindow" );
	~MainWindow(){}
 
private:
	QPopupMenu * file;
};
 
------------------------------------------------------------------------------------------------------
//myfile.cpp
 
ArrowPad::ArrowPad(QWidget *parent, const char *name)
: QWidget(parent, name)
{
	up = new QPushButton(tr("&UP"), this) ;
	up->setGeometry(200, 100, 40, 40);
 
	left = new QPushButton(tr("&LEFT"), this) ;
	left->setGeometry(150, 140, 40, 40);
 
	right = new QPushButton(tr("&RIGHT"), this) ;
	right->setGeometry(250, 140, 40, 40);
 
	down = new QPushButton(tr("&DOWN"), this) ;
	down->setGeometry(200, 180, 40, 40);
 
}
 
MainWindow::MainWindow(QWidget *parent, const char *name)
:QMainWindow(parent, name)
{
	 file = new QPopupMenu(this);
	 menuBar()->insertItem( tr("&File"), file);
	 file->insertItem( tr("E&xit"), qApp, SLOT(quit()),
                          tr("Ctrl+Q", "Quit") );
	 ArrowPad *ap = new ArrowPad( this, "arrow pad" );
	 setCentralWidget(ap);
	 resize(500, 500);
}
------------------------------------------------------------------------------------------------------
//main.cpp
 
#include <qapplication.h>
#include <qpushbutton.h>
#include <qtranslator.h>
#include <qtextcodec.h>
#include "test.h"
 
 
int main( int argc, char **argv )
{
    QApplication app( argc, argv );
 
	MainWindow mw;
 
	QTranslator translator( 0 );	
	translator.load( "tt2_fr", "." );    
    app.installTranslator( &translator );    
 
    app.setMainWidget( &mw );
    mw.show();
    return app.exec();
}

--------------------------------------------------------------------------------------------------
//myfile.h

class ArrowPad : public QWidget
{
	Q_OBJECT
public:
	ArrowPad(QWidget *parent=0, const char *name="ArrowPad" );
	~ArrowPad(){}
private:
	 QPushButton* up;
	 QPushButton* left;
	 QPushButton* right;
	 QPushButton* down;
};

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
	MainWindow(QWidget *parent=0, const char *name="MainWindow" );
	~MainWindow(){}

private:
	QPopupMenu * file;
};

------------------------------------------------------------------------------------------------------
//myfile.cpp

ArrowPad::ArrowPad(QWidget *parent, const char *name)
: QWidget(parent, name)
{
	up = new QPushButton(tr("&UP"), this) ;
	up->setGeometry(200, 100, 40, 40);

	left = new QPushButton(tr("&LEFT"), this) ;
	left->setGeometry(150, 140, 40, 40);

	right = new QPushButton(tr("&RIGHT"), this) ;
	right->setGeometry(250, 140, 40, 40);

	down = new QPushButton(tr("&DOWN"), this) ;
	down->setGeometry(200, 180, 40, 40);

}

MainWindow::MainWindow(QWidget *parent, const char *name)
:QMainWindow(parent, name)
{
	 file = new QPopupMenu(this);
	 menuBar()->insertItem( tr("&File"), file);
	 file->insertItem( tr("E&xit"), qApp, SLOT(quit()),
                          tr("Ctrl+Q", "Quit") );
	 ArrowPad *ap = new ArrowPad( this, "arrow pad" );
	 setCentralWidget(ap);
	 resize(500, 500);
}
------------------------------------------------------------------------------------------------------
//main.cpp

#include <qapplication.h>
#include <qpushbutton.h>
#include <qtranslator.h>
#include <qtextcodec.h>
#include "test.h"


int main( int argc, char **argv )
{
    QApplication app( argc, argv );

	MainWindow mw;

	QTranslator translator( 0 );	
	translator.load( "tt2_fr", "." );    
    app.installTranslator( &translator );    

    app.setMainWidget( &mw );
    mw.show();
    return app.exec();
}

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I have also created *.ts and *.qm files using lupdate and lrelease but still the program shows me english text. I have taken this sample from Qt linguist manual, section->Programmers

Any comment will be highly appreciated
Thanx

[jpn]

What does QTranslator::load() return?

[vermarajeev]

What does QTranslator::load() return?

Hi thankx for your reply,
I have just added this code in my main.cpp

bool flag = translator.load( "tt2_fr", "." );   
if(flag)
    qDebug("File loaded successfully");
else
   qDebug("Failed");

bool flag = translator.load( "tt2_fr", "." );   
if(flag)
    qDebug("File loaded successfully");
else
   qDebug("Failed");

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This returns true and displays File loaded successfully.

Thankx

[wysota]

Load the translator before creating the window or provide support for language change event for the window.

[vermarajeev]

Load the translator before creating the window or provide support for language change event for the window.

Hi, Can you please explain with an example as I'm unable to get you.

[vermarajeev]

Hi, Can you please explain with an example as I'm unable to get you.

hey Thankx it works,
I loaded the translator before creating the window

Thankx a lot,