主界面

点击play按钮播放或暂停音乐，拖动进度条，音乐对应播放。

	QWidget window;QPushButton* playButton = new QPushButton("Play");// Qt 播放音乐// 创建 QMediaPlayer 对象QMediaPlayer* player = new QMediaPlayer;// 指定音频文件的路径QString audioFilePath = QString::fromLocal8Bit(std::string("./红昭愿.mp3").c_str());// 加载音频文件player->setMedia(QUrl::fromLocalFile(audioFilePath));// 创建进度条QSlider* seekSlider = new QSlider(Qt::Horizontal);QObject::connect(seekSlider, &QSlider::sliderMoved, [&](int position) {if (seekSlider->isSliderDown())player->setPosition(position * 1000);});// 音频准备就绪后，获取音频的总时长(ms)QObject::connect(player, &QMediaPlayer::mediaStatusChanged, [=](QMediaPlayer::MediaStatus status) {if (status == QMediaPlayer::BufferedMedia) {qint64 duration = player->duration();qDebug() << duration;return;}});QObject::connect(playButton, &QPushButton::clicked, [=]() {if (player->state() == QMediaPlayer::PlayingState)player->pause();elseplayer->play();});QVBoxLayout* layout = new QVBoxLayout;layout->addWidget(playButton);layout->addWidget(seekSlider);window.setLayout(layout);window.setWindowTitle("QtPlayMusic");window.show();