下一个能播放视频和音乐并且功能基本齐全的Qt代码

以下是一个基本的Qt代码，可以播放本地视频和音乐文件，包括基本的控制功能：

#include <QtWidgets>
#include <QtMultimedia>

class VideoPlayer : public QWidget
{
    Q_OBJECT

public:
    VideoPlayer(QWidget *parent = nullptr);

private slots:
    void openFile();
    void play();
    void pause();
    void stop();
    void updatePosition(qint64 position);
    void setPosition(int position);

private:
    QMediaPlayer *player;
    QLabel *titleLabel;
    QSlider *positionSlider;
    QPushButton *playButton;
    QPushButton *pauseButton;
    QPushButton *stopButton;
};

VideoPlayer::VideoPlayer(QWidget *parent)
    : QWidget(parent), player(new QMediaPlayer(this))
{
    // UI setup
    titleLabel = new QLabel(tr("No media file loaded."));
    positionSlider = new QSlider(Qt::Horizontal);
    positionSlider->setRange(0, player->duration() / 1000);

    playButton = new QPushButton(tr("Play"));
    connect(playButton, &QPushButton::clicked, this, &VideoPlayer::play);

    pauseButton = new QPushButton(tr("Pause"));
    connect(pauseButton, &QPushButton::clicked, this, &VideoPlayer::pause);

    stopButton = new QPushButton(tr("Stop"));
    connect(stopButton, &QPushButton::clicked, this, &VideoPlayer::stop);

    QPushButton *openButton = new QPushButton(tr("Open"));
    connect(openButton, &QPushButton::clicked, this, &VideoPlayer::openFile);

    // Layout setup
    QGridLayout *layout = new QGridLayout;
    layout->addWidget(titleLabel, 0, 0, 1, 4);
    layout->addWidget(positionSlider, 1, 0, 1, 4);
    layout->addWidget(playButton, 2, 0);
    layout->addWidget(pauseButton, 2, 1);
    layout->addWidget(stopButton, 2, 2);
    layout->addWidget(openButton, 2, 3);
    setLayout(layout);

    // Player setup
    connect(player, &QMediaPlayer::positionChanged, this, &VideoPlayer::updatePosition);
    connect(player, &QMediaPlayer::durationChanged, [this](qint64 duration) {
        positionSlider->setRange(0, duration / 1000);
    });
}

void VideoPlayer::openFile()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"));
    if (!fileName.isEmpty()) {
        player->setMedia(QUrl::fromLocalFile(fileName));
        titleLabel->setText(QFileInfo(fileName).fileName());
        playButton->setEnabled(true);
    }
}

void VideoPlayer::play()
{
    player->play();
    pauseButton->setEnabled(true);
    stopButton->setEnabled(true);
}

void VideoPlayer::pause()
{
    player->pause();
}

void VideoPlayer::stop()
{
    player->stop();
    pauseButton->setEnabled(false);
    stopButton->setEnabled(false);
}

void VideoPlayer::updatePosition(qint64 position)
{
    positionSlider->setValue(position / 1000);
}

void VideoPlayer::setPosition(int position)
{
    player->setPosition(position * 1000);
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    VideoPlayer player;
    player.show();

    return app.exec();
}

#include "main.moc"

要使用Qt Multimedia模块，需要在.pro文件中添加以下行：

QT += multimedia