Why i can read the metaData?

[langziyang]

my code is
@
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QUrl>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
mediaObjcet = new Phonon::MediaObject;
audioOutput = new Phonon::AudioOutput(Phonon::MusicCategory,this);
Phonon::createPath(mediaObjcet,audioOutput);
QUrl url("X:/music/01-the_little_hands_of_asphalt-oslo-prs.mp3");
mediaObjcet->setCurrentSource(url);
playit();
}

void MainWindow::playit(){
QMap<QString, QString> metaData = mediaObjcet->metaData();
QString title = metaData.value("TITLE");
qDebug()<<title;
mediaObjcet->play();
}

MainWindow::~MainWindow()
{
delete ui;
}
@

when i run this pro.the DeBug nothing.

[langziyang]

OK,now i find how can read it. but i am Chinese. so, when file is Chinese code.the metaData is messy code.even i used the
QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF8"));
QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF8"));
QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF8"));
how fix it