void showWindow(QtSingleApplication &app, const QString &dataDir) {
MainWindow *mainWin = new MainWindow();
void showWindow(QtSingleApplication &app, const QString &dataDir) {
MainWindow *mainWin = new MainWindow();
mainWin->connect(&app, SIGNAL(messageReceived(const QString &)),
mainWin, SLOT(messageReceived(const QString &)));
app.setActivationWindow(mainWin, true);
mainWin->connect(&app, SIGNAL(messageReceived(const QString &)),
mainWin, SLOT(messageReceived(const QString &)));
app.setActivationWindow(mainWin, true);