帮我写一个基于C++和QT的音乐播放器

好的，我可以回答这个问题。下面是一个基于C和QT的音乐播放器的示例代码：

#include <QtGui>
#include <QtWidgets>
#include <QtCore>
#include <phonon>

class MusicPlayer : public QWidget
{
    Q_OBJECT
public:
    MusicPlayer(QWidget *parent = 0);
private slots:
    void openFile();
    void play();
    void pause();
    void stop();
    void seek(int seconds);
    void updatePosition(qint64 position);
    void updateDuration(qint64 duration);
private:
    QMediaPlayer *player;
    QSlider *positionSlider;
    QLabel *positionLabel;
    QLabel *durationLabel;
    QPushButton *playButton;
    QPushButton *pauseButton;
    QPushButton *stopButton;
};

MusicPlayer::MusicPlayer(QWidget *parent)
    : QWidget(parent)
{
    QGridLayout *layout = new QGridLayout(this);

    positionSlider = new QSlider(Qt::Horizontal, this);
    positionSlider->setRange(0, 0);
    positionSlider->setToolTip(tr("Position"));
    connect(positionSlider, SIGNAL(sliderMoved(int)), this, SLOT(seek(int)));
    layout->addWidget(positionSlider, 0, 0, 1, 3);

    positionLabel = new QLabel(this);
    positionLabel->setMinimumWidth(50);
    positionLabel->setText("00:00");
    layout->addWidget(positionLabel, 1, 0);

    durationLabel = new QLabel(this);
    durationLabel->setMinimumWidth(50);
    durationLabel->setText("00:00");
    layout->addWidget(durationLabel, 1, 2);

    playButton = new QPushButton(tr("Play"), this);
    connect(playButton, SIGNAL(clicked()), this, SLOT(play()));
    layout->addWidget(playButton, 2, 0);

    pauseButton = new QPushButton(tr("Pause"), this);
    connect(pauseButton, SIGNAL(clicked()), this, SLOT(pause()));
    layout->addWidget(pauseButton, 2, 1);

    stopButton = new QPushButton(tr("Stop"), this);
    connect(stopButton, SIGNAL(clicked()), this, SLOT(stop()));
    layout->addWidget(stopButton, 2, 2);

    player = new QMediaPlayer(this);
    connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(updatePosition(qint64)));
    connect(player, SIGNAL(durationChanged(qint64)), this, SLOT(updateDuration(qint64)));
}

void MusicPlayer::openFile()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), QDir::homePath());
    if (!fileName.isEmpty()) {
        player->setMedia(QUrl::fromLocalFile(fileName));
        playButton->setEnabled(true);
        durationLabel->setText(QString::fromStdString(std::to_string(player->duration() / 1000 / 60) + ":" + std::to_string(player->duration() / 1000 % 60)));
    }
}

void MusicPlayer::play()
{
    player->play();
    playButton->setEnabled(false);
    pauseButton->setEnabled(true);
    stopButton->setEnabled(true);
}

void MusicPlayer::pause()
{
    player->pause();
    playButton->setEnabled(true);
    pauseButton->setEnabled(false);
}

void MusicPlayer::stop()
{
    player->stop();
    playButton->setEnabled(true);
    pauseButton->setEnabled(false);
    stopButton->setEnabled(false);
    positionSlider->setValue(0);
}

void MusicPlayer::seek(int seconds)
{
    player->setPosition(seconds * 1000);
}

void MusicPlayer::updatePosition(qint64 position)
{
    positionLabel->setText(QString::fromStdString(std::to_string(position