source: trunk/examples/activeqt/simple/main.cpp

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#include <QAxBindable>
#include <QAxFactory>
#include <QApplication>
#include <QLayout>
#include <QSlider>
#include <QLCDNumber>
#include <QLineEdit>
#include <QMessageBox>

//! [0]
class QSimpleAX : public QWidget, public QAxBindable
{
    Q_OBJECT
    Q_PROPERTY( QString text READ text WRITE setText )
    Q_PROPERTY( int value READ value WRITE setValue )
public:
    QSimpleAX(QWidget *parent = 0)
    : QWidget(parent)
    {
        QVBoxLayout *vbox = new QVBoxLayout( this );

        slider = new QSlider( Qt::Horizontal, this );
        LCD = new QLCDNumber( 3, this );
        edit = new QLineEdit( this );

        connect( slider, SIGNAL(valueChanged(int)), this, SLOT(setValue(int)) );
        connect( edit, SIGNAL(textChanged(QString)), this, SLOT(setText(QString)) );

        vbox->addWidget( slider );
        vbox->addWidget( LCD );
        vbox->addWidget( edit );
    }

    QString text() const 
    { 
        return edit->text(); 
    }
    int value() const
    {
        return slider->value();
    }

signals:
    void someSignal();
    void valueChanged(int);
    void textChanged(const QString&);

public slots:
    void setText( const QString &string )
    {
        if ( !requestPropertyChange( "text" ) )
            return;

        edit->blockSignals( true );
        edit->setText( string );
        edit->blockSignals( false );
        emit someSignal();
        emit textChanged( string );

        propertyChanged( "text" );
    }
    void about()
    {
        QMessageBox::information( this, "About QSimpleAX", "This is a Qt widget, and this slot has been\n"
                                                          "called through ActiveX/OLE automation!" );
    }
    void setValue( int i )
    {
        if ( !requestPropertyChange( "value" ) )
            return;
        slider->blockSignals( true );
        slider->setValue( i );
        slider->blockSignals( false );
        LCD->display( i );
        emit valueChanged( i );

        propertyChanged( "value" );
    }

private:
    QSlider *slider;
    QLCDNumber *LCD;
    QLineEdit *edit;
};

//! [0]
#include "main.moc"

//! [1]
QAXFACTORY_DEFAULT(QSimpleAX,
           "{DF16845C-92CD-4AAB-A982-EB9840E74669}",
           "{616F620B-91C5-4410-A74E-6B81C76FFFE0}",
           "{E1816BBA-BF5D-4A31-9855-D6BA432055FF}",
           "{EC08F8FC-2754-47AB-8EFE-56A54057F34E}",       
           "{A095BA0C-224F-4933-A458-2DD7F6B85D8F}")
//! [1]