#include <QtGui>

class MyWidget : public QWidget
{
    Q_OBJECT
public:
    MyWidget(QWidget *parent = 0) : QWidget(parent)
    {
        QPushButton* button= new QPushButton("openUrl");

        QVBoxLayout* layout= new QVBoxLayout(this);
        layout->addWidget(button);
        layout->addStretch();

        connect(button, SIGNAL(clicked()), this, SLOT(openUrl()));
    }
public slots:
    void openUrl()
    {
        QDesktopServices::openUrl(QUrl("http://www.google.fi/search?q=testme%20withspace"));
    }

};

#include "main.moc"

int main(int argc, char **argv)
{
    QApplication a(argc, argv);
    MyWidget w;
    w.showMaximized();
    return a.exec();
}