Simple Example (ActiveQt)

The Simple example demonstrates the use of QAxBindable::requestPropertyChange() and QAxBindable::propertyChanged(), and the use of QAxFactory through the QAXFACTORY_BEGIN(), QAXCLASS() and QAXFACTORY_END() macros.

The ActiveX control in this example is a laid out QWidget with a QSlider, a QLCDNumber and a QLineEdit. It provides a signal/slot/property interface to change the values of the slider and the line edit, and to get notified of any property changes.

The Qt implementation of the ActiveX for this example is

class QSimpleAX : public QWidget, public QAxBindable
    Q_CLASSINFO("ClassID",     "{DF16845C-92CD-4AAB-A982-EB9840E74669}")
    Q_CLASSINFO("InterfaceID", "{616F620B-91C5-4410-A74E-6B81C76FFFE0}")
    Q_CLASSINFO("EventsID",    "{E1816BBA-BF5D-4A31-9855-D6BA432055FF}")
    Q_PROPERTY( QString text READ text WRITE setText )
    Q_PROPERTY( int value READ value WRITE setValue )
    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, &QAbstractSlider::valueChanged, this, &QSimpleAX::setValue );
        connect( edit, &QLineEdit::textChanged, this, &QSimpleAX::setText );

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

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

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

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

        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" ) )
        slider->blockSignals( true );
        slider->setValue( i );
        slider->blockSignals( false );
        LCD->display( i );
        emit valueChanged( i );

        propertyChanged( "value" );

    QSlider *slider;
    QLCDNumber *LCD;
    QLineEdit *edit;

The control is exported using the default QAxFactory

    "{EC08F8FC-2754-47AB-8EFE-56A54057F34E}", // type library ID
    "{A095BA0C-224F-4933-A458-2DD7F6B85D8F}") // application ID

To build the example you must first build the QAxServer library. Then run qmake and your make tool in examples/activeqt/simple.

The demonstration requires your WebBrowser to support ActiveX controls, and scripting to be enabled.

The simple ActiveX control is embedded using the <object> tag.

<object ID="QSimpleAX" CLASSID="CLSID:DF16845C-92CD-4AAB-A982-EB9840E74669"
    <PARAM NAME="text" VALUE="A simple control" />
    <PARAM NAME="value" VALUE="1" />
[Object not available! Did you forget to build and register the server?]

A simple HTML button is connected to the ActiveQt's about() slot.

    <INPUT TYPE="BUTTON" VALUE="About..." onClick="QSimpleAX.about()" />

A second ActiveX control - the standard Calendar Control - is instantiated

<object ID="Calendar" CLASSID="CLSID:8E27C92B-1264-101C-8A2F-040224009C02">
[Standard Calendar control not available!]
    <PARAM NAME="day" VALUE="1" />

Events from the ActiveX controls are handled using both Visual Basic Script and JavaScript.

Sub Calendar_Click()
    MsgBox( "Calendar Clicked!" )
End Sub

Sub QSimpleAX_TextChanged( str )
    document.title = str
End Sub

function QSimpleAX::ValueChanged( Newvalue )
    Calendar.Day = Newvalue;


© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.