Exit with an error message if BASS_Init fails

This resolves #27

src/QUMainWindow.cpp

@@ -54,10 +54,6 @@ QUMainWindow::QUMainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::QUM
 	lyricsProgressBar->setFormat("%v/%m (%p%)");
 	QMainWindow::statusBar()->addPermanentWidget(lyricsProgressBar, 1);
 
-	if (BASS_Init(-1, 44100, 0, 0, NULL)) {
-		QMainWindow::statusBar()->showMessage(tr("BASS initialized."));
-	}
-
 	QSettings settings;
 	bool firstRun = settings.value("firstRun", "true").toBool();
 

src/main.cpp

@@ -15,6 +15,7 @@
 //#include <QRandomGenerator>
 
 void initApplication();
+void initBASS();
 void initLanguage(QApplication&, QTranslator&, QTranslator&, QSplashScreen&);
 void handlePreviousAppCrash();
 void handleWipWarning();
@@ -49,6 +50,7 @@ int main(int argc, char *argv[]) {
 	handleArguments();
 
 	QUMainWindow mainWindow;
+	initBASS();
 	app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()));
 
 	mainWindow.show();
@@ -70,6 +72,22 @@ void initApplication() {
 	QCoreApplication::setApplicationName("UltraStar Creator");
 }
 
+void initBASS()
+{
+	if (!BASS_Init(-1, 44100, 0, 0, NULL))
+	{
+		QPushButton *quitButton = new QPushButton();
+		QMessageBox dlg;
+		dlg.setWindowTitle("BASS could not be initialized");
+		dlg.setText("BASS audio library could not initialize the audio device.\nThe application will quit now.");
+		dlg.setDefaultButton(quitButton);
+		dlg.setIcon(QMessageBox::Critical);
+
+		QObject::connect(&dlg, &QMessageBox::accepted, qApp, &QCoreApplication::quit, Qt::QueuedConnection);
+		dlg.exec();
+	}
+}
+
 /*!
  * Installs a proper translator according to the registry settings. That's why you
  * have to restart this application if you want to change its language. Uses the system