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<concept id="GUID-95DD1440-01C9-4997-8DD4-FFD33D7DEAFF" xml:lang="en"><title>Application-specific
events</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeAppUiClass.html#%3a%3aCCoeAppUi%3a%3aHandleApplicationSpecificEventL%28TInt%2cconst%20TWsEvent%20%26amp%3b%29" format="application/java-archive"><parmname>CCoeAppUi:HandleApplicationSpecificEventL()</parmname></xref> is
called for application-specific events where event codes are from <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Window_Server/TKeyEventStruct.html" format="application/java-archive"><parmname>EEventUser</parmname></xref> upwards in <parmname>TEventCode</parmname>. You can define
a data structure to be delivered in the window server event. The data can
be accessed through a pointer, which can be obtained by calling<xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Window_Server/TWsEventClass.html#%3a%3aTWsEvent%3a%3aEventData%28%29const" format="application/java-archive"><parmname> TWsEvent::EventData()</parmname></xref>. The maximum event
data size is defined as <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Window_Server/TWsEventClass.html#%3a%3aTWsEvent%3a%3aEWsEventDataSize" format="application/java-archive"><parmname>EWsEventDataSize</parmname></xref>. </p>
<codeblock id="GUID-80335267-13AB-49C8-8895-B6598F5D59A4" xml:space="preserve">void HandleApplicationSpecificEventL(TInt aType,const TWsEvent&amp; aEvent)
</codeblock>
<p>Code example: </p>
<p>First define a data structure for the event data:</p>
<codeblock id="GUID-BBC9DCFA-F46C-4AC9-BC7F-B1A2DB39963A" xml:space="preserve">class TEventsEventType
    {
    public:
        // Event iData
        TBufC&lt; TWsEvent::EWsEventDataSize&gt; data;
        };
</codeblock>
<p>Then create an event and send it to all window groups:</p>
<codeblock id="GUID-0E8CE3D4-19F2-46D6-9A22-9A7EBC73F5C5" xml:space="preserve">// Create a window server event
TWsEvent event;
TEventsEventType eventType;
// Set event data. eventType.data = KData;
event.SetType( ETestEvent1 ); // set event type
event.SetTimeNow(); // set the event time
event.SetHandle( iWsSession.WsHandle() ); // set window server handle
*( TEventsEventType* )( event.EventData() ) = eventType; // set event data
// Send the created event
User::LeaveIfError( iWsSession.SendEventToAllWindowGroups( event ) );
</codeblock>
<p>Catch the event using the following method:</p>
<codeblock id="GUID-1BF859E7-EC92-4BDA-AFCE-DEB82854C8D7" xml:space="preserve">void CEventsAppUi::HandleApplicationSpecificEventL(TInt aType,const TWsEvent&amp; aEvent)
    {
    // Check the event type
    if( aType == ETestEvent1 )
        {
        // Cast to TEventsEventType
        TEventsEventType event;
        event = *( TEventsEventType* )aEvent.EventData();
        // Print the data
        iEikonEnv-&gt;InfoMsg( event.data );
        }
        // Call the base class implementation
        CEikAppUi::HandleApplicationSpecificEventL( aType, aEvent );
    }
</codeblock>
</conbody></concept>