Russian Qt Forum

int main(int argc, char *argv[])
{
    QApplication a(argc, argv); 
    MainWindow window;
    window.resize(150, 100);

    QLabel *label = new QLabel("Hello, label!", &window);
    QMetaObject::invokeMethod(label, SLOT(setText(const QString &)),Q_ARG(QString, "test"));

    window.show();
    return a.exec();
}