main.cpp Example File

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  #include <QApplication>
  #include <QMessageBox>
  #include <QMainWindow>
  #include <QDesktopWidget>
  #include <QVariant>
  #include <QSettings>
  #include <QFileDialog>
  #include <QCommandLineParser>

  #include "ui_mainwindow.h"

  static const char geometryKey[] = "Geometry";

  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  public:
      MainWindow();
      ~MainWindow();
      void openMedia(const QString &mediaUrl);

  public slots:
      void on_mediaPlayer_PlayStateChange(int newState);
      void on_actionOpen_triggered();
      void on_actionExit_triggered();
      void on_actionAbout_triggered();
      void on_actionAboutQt_triggered();

  private:
      void updateWindowTitle(const QString &state);
      Ui::MainWindow m_ui;
  };

  MainWindow::MainWindow()
  {
      m_ui.setupUi(this);

      QSettings settings(QSettings::IniFormat, QSettings::UserScope,
                         QCoreApplication::organizationName(), QCoreApplication::applicationName());

      const QByteArray restoredGeometry = settings.value(QLatin1String(geometryKey)).toByteArray();
      if (restoredGeometry.isEmpty() || !restoreGeometry(restoredGeometry)) {
          const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
          const QSize size = (availableGeometry.size() * 4) / 5;
          resize(size);
          move(availableGeometry.center() - QPoint(size.width(), size.height()) / 2);
      }

      m_ui.mediaPlayer->dynamicCall("enableContextMenu", false);
      m_ui.mediaPlayer->dynamicCall("stretchToFit", true);
      updateWindowTitle("");
  }

  MainWindow::~MainWindow()
  {
      QSettings settings(QSettings::IniFormat, QSettings::UserScope,
                         QCoreApplication::organizationName(), QCoreApplication::applicationName());
      settings.setValue(QLatin1String(geometryKey), saveGeometry());
  }

  void MainWindow::on_mediaPlayer_PlayStateChange(int newState)
  {
      static const QHash<int, const char *> stateMapping {
          {1,  "Stopped"},
          {2,  "Paused"},
          {3,  "Playing"},
          {4,  "Scanning Forwards"},
          {5,  "Scanning Backwards"},
          {6,  "Buffering"},
          {7,  "Waiting"},
          {8,  "Media Ended"},
          {9,  "Transitioning"},
          {10, "Ready"},
          {11, "Reconnecting"},
      };
      const char *stateStr = stateMapping.value(newState, "");
      updateWindowTitle(tr(stateStr));
  }

  void MainWindow::on_actionOpen_triggered()
  {
      QFileDialog fileDialog(this, tr("Open File"));
      fileDialog.setAcceptMode(QFileDialog::AcceptOpen);
      fileDialog.setFileMode(QFileDialog::ExistingFile);
      fileDialog.setMimeTypeFilters({ "application/octet-stream", "video/x-msvideo", "video/mp4", "audio/mpeg", "audio/mp4" });
      if (fileDialog.exec() == QDialog::Accepted)
          openMedia(fileDialog.selectedFiles().first());
  }

  void MainWindow::on_actionExit_triggered()
  {
      QCoreApplication::quit();
  }

  void MainWindow::on_actionAbout_triggered()
  {
      QMessageBox::about(this, tr("About Media Player"),
                  tr("This Example has been created using the ActiveQt integration into Qt Designer.\n"
                     "It demonstrates the use of QAxWidget to embed the Windows Media Player ActiveX\n"
                     "control into a Qt application."));
  }

  void MainWindow::on_actionAboutQt_triggered()
  {
      QMessageBox::aboutQt(this, tr("About Qt"));
  }

  void MainWindow::openMedia(const QString &mediaUrl)
  {
      if (!mediaUrl.isEmpty())
          m_ui.mediaPlayer->dynamicCall("URL", mediaUrl);
  }

  void MainWindow::updateWindowTitle(const QString &state)
  {
      QString appName = QCoreApplication::applicationName();
      QString title = state.isEmpty() ? appName :
                      QString("%1 (%2)").arg(appName, state);
      setWindowTitle(title);
  }

  #include "main.moc"

  int main(int argc, char *argv[])
  {
      QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
      QApplication app(argc, argv);
      QCoreApplication::setApplicationVersion(QT_VERSION_STR);
      QCoreApplication::setApplicationName(QLatin1String("Active Qt Media Player"));
      QCoreApplication::setOrganizationName(QLatin1String("QtProject"));

      MainWindow w;
      QCommandLineParser parser;
      parser.setApplicationDescription(QCoreApplication::applicationName());
      parser.addHelpOption();
      parser.addVersionOption();
      parser.addPositionalArgument("file", "The media file to open.");
      parser.process(app);
      if (!parser.positionalArguments().isEmpty())
          w.openMedia(parser.positionalArguments().constFirst());
      w.show();
      return app.exec();
  }