#include <QtGui/QApplication>
#include <QtGui/QPushButton>
#include <QtCore/QDebug>
#include <QtScript/QScriptEngine>

class Test : public QObject
{
    Q_OBJECT
public slots:
    void evaluate() {
        for (int i=0; i!=1000;++i) {
            QString sFunction = QString( QLatin1String( "function vparam(a,b,c,d,e) { return (e<<16) | a | b | c | d; }" ) );
            QScriptValue sv = scriptEngine.evaluate( sFunction );
            if( scriptEngine.hasUncaughtException() )
            {
                qDebug() << "Script error";
                return;
            }

            QScriptValueList svlArgs;
            svlArgs << 0 << 0 << 0 << 0 << 1;

            QScriptValue fnObj = scriptEngine.globalObject().property( QLatin1String( "vparam" ) );
            QScriptValue fnRes = fnObj.call( QScriptValue(), svlArgs );

            QString sResult = fnRes.toString();
            if( sResult.isEmpty() )
            {
                qDebug() << "Script error";
                return;
            }

            qDebug() << sResult.toInt();
        }
    }
private:
    QScriptEngine scriptEngine;
};

#include "main.moc"

int main( int argc, char **argv )
{
    QApplication app( argc, argv );
    QPushButton button("text");

    Test test;

    QObject::connect(&button, SIGNAL(clicked()), &test, SLOT(evaluate()));

    button.show();
    return app.exec();
}