Usage of QT_TR_NOOP()

[kichi]

Hi everybody,

I would like to know usage of QT_TR_NOOP() (not QT_TRANSLATE_NOOP()).

I use the Qt SDK 4.5.1 in Linux/X11 and work in Qt Creator 1.1.0.

I wrote a sample code as follows.

#include <QApplication>
#include <QMainWindow>
#include <QTranslator>
#include <QString>
#include <QtGlobal>
 
class MyMessage {
	Q_DECLARE_TR_FUNCTIONS(MyMessage)
public:			
	MyMessage(){}
	~MyMessage(){}
 
	static QString GetMessage() {
		static const char* message = QT_TR_NOOP("Hello");
		return QString(QObject::tr(message));
	}
};
 
int main(int argc, char *argv[])
{
	QApplication 	application(argc, argv);
	QMainWindow 	mainWindow;
	QTranslator		translator;
 
	translator.load("./MyAppMessages.qm");
	application.installTranslator(&translator);
 
	mainWindow.setWindowTitle(MyMessage::GetMessage());
	mainWindow.show();
 
	return application.exec();
}

#include <QApplication>
#include <QMainWindow>
#include <QTranslator>
#include <QString>
#include <QtGlobal>

class MyMessage {
	Q_DECLARE_TR_FUNCTIONS(MyMessage)
public:			
	MyMessage(){}
	~MyMessage(){}
	
	static QString GetMessage() {
		static const char* message = QT_TR_NOOP("Hello");
		return QString(QObject::tr(message));
	}
};

int main(int argc, char *argv[])
{
	QApplication 	application(argc, argv);
	QMainWindow 	mainWindow;
	QTranslator		translator;
	
	translator.load("./MyAppMessages.qm");
	application.installTranslator(&translator);
	
	mainWindow.setWindowTitle(MyMessage::GetMessage());
	mainWindow.show();
	
	return application.exec();
}

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And I made "MyAppMessages.qm" with lupdate, Qt Linguist, and lrelease to translate the message "Hello" into Japanese.
And I built and ran the program.
but window title was "Hello" yet.

Although I am studying English hard, my English is not great yet,
and I may make many mistakes. So, please be patient with me.

Thank you very much for any kind of help.
kichi