problem with show Chinese

Hi:
everyone,I have a problem with show Chinese.
Below,It's my code:

Code:

#include <QTextCodec>
#include <QMainWindow>
#include <QAction>
#include <QMenu>
#include <QTextCodec>
#include <QMenuBar>
#include <QApplication>
 
 
class ChineseWindow : public QMainWindow
{
 
public:
	ChineseWindow( QWidget* parent=0 );
	virtual ~ChineseWindow();
 
private:	
	QAction*	iOpenFileAct;[/B]
	QMenu*		iFileMenu;
 
};
 
 
 
ChineseWindow::ChineseWindow( QWidget* parent ):QMainWindow( parent )
{
	iOpenFileAct = new QAction( tr( "打开" ), this );//this action can not show
	iFileMenu = new QMenu( tr( "文件" ), this );//this menu can not show 
	iFileMenu->addAction( iOpenFileAct );
 
	this->menuBar()->addMenu( iFileMenu );
 
	this->setGeometry( 400, 300, 400, 300 );
	this->setWindowTitle( tr( "图片浏览器" ) );
 
	//this->setWindowTitle( QString::fromUtf8( "图片浏览器" ) );
}
 
ChineseWindow::~ChineseWindow()
{
 
	if( iOpenFileAct )
	{
		delete iOpenFileAct;
		iOpenFileAct = NULL;
	}
 
	if( iFileMenu )
	{
		delete iFileMenu;
		iFileMenu = NULL;
	}
 
}
 
 
int main( int argc, char** argv )
{
 
	QTextCodec::setCodecForLocale( QTextCodec::codecForName( "UTF-8" ) );
    	QTextCodec::setCodecForCStrings( QTextCodec::codecForName("UTF-8") );
	QTextCodec::setCodecForTr( QTextCodec::codecForName("UTF-8") );
 
 
	QApplication app( argc, argv );
 
 
 
	ChineseWindow cw;
	cw.show();
 
	return app.exec();
 
}

the action and menu can not show,but the window tiltle can show the Chinese.
why?
Please give me a hand.Thank you very much!