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();
 }