time displayer not working in media player

[qt_user]

I havbe made a media player...... I have used the code of timer of "media Player " example of Qt but it is not working........ if anybody could tell me the cause,...........here's the code:

//In class VideoPlayer
connect(videoPlayerControls->slider,SIGNAL(valueChanged()),videoDisplayer,SLOT(updateTime()));
 
//In class VideoDisplayer
void VideoDisplayer::updateTime()
{
	int msec = totalTime;
	int sec = msec/1000;
	int min = sec/60;
	int hour = min/60;
 
	QTime stopTime(hour%60, min%60, sec%60, msec%1000);
 
	int currentTime = i*40;
	msec = currentTime; 
	sec = msec/1000;
	min = sec/60;
	hour = min/60;
	QTime playTime(hour%60, min%60, sec%60, msec%1000);
	QString timeFormat = "m:ss";
 
 
	if(hour > 0)
		timeFormat = "h:mm:ss";
		timeString = playTime.toString(timeFormat);
	    //timeString = "";
    if(totalTime)
		timeString += " / " + stopTime.toString(timeFormat);
		localDisplayerTimeLabel->setText(timeString);
        localDisplayerTimeLabel->show();  
 }

//In class VideoPlayer
connect(videoPlayerControls->slider,SIGNAL(valueChanged()),videoDisplayer,SLOT(updateTime()));

//In class VideoDisplayer
void VideoDisplayer::updateTime()
{
	int msec = totalTime;
	int sec = msec/1000;
	int min = sec/60;
	int hour = min/60;

	QTime stopTime(hour%60, min%60, sec%60, msec%1000);

	int currentTime = i*40;
	msec = currentTime; 
	sec = msec/1000;
	min = sec/60;
	hour = min/60;
	QTime playTime(hour%60, min%60, sec%60, msec%1000);
	QString timeFormat = "m:ss";
	
	
	if(hour > 0)
		timeFormat = "h:mm:ss";
		timeString = playTime.toString(timeFormat);
	    //timeString = "";
    if(totalTime)
		timeString += " / " + stopTime.toString(timeFormat);
		localDisplayerTimeLabel->setText(timeString);
        localDisplayerTimeLabel->show();  
 }

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I have come to know about the problem..the updateTime function is not working...can anybody tell why is it so......as the slider is working correctly..