diff -r 666f914201fb -r 2fe1408b6811 epoc32/include/sensrvchannellistener.h
--- a/epoc32/include/sensrvchannellistener.h	Tue Nov 24 13:55:44 2009 +0000
+++ b/epoc32/include/sensrvchannellistener.h	Tue Mar 16 16:12:26 2010 +0000
@@ -1,1 +1,95 @@
-sensrvchannellistener.h
+/*
+* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members
+* which accompanies this distribution, and is available
+* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Interface for channel listener
+*
+*/
+
+
+
+#ifndef SENSRVCHANNELLISTENER_H
+#define SENSRVCHANNELLISTENER_H
+
+
+#include <e32base.h>
+#include <sensrvchannelfinder.h>
+#include <sensrvtypes.h>
+#include <sensrvchannelinfo.h>
+
+/**
+* Channel listener callback interface to indicate when channels have been added or removed.
+* 
+* This class is for use with the CSensrvChannelFinder::SetChannelListenerL() method. Clients wishing
+* to find channels must inherit from this class and provide a reference to an instance of it in
+* CSensrvChannelFinder::SetChannelListenerL().
+* 
+* @see CSensrvChannelFinder::SetChannelListenerL()
+* @lib sensrvclient.lib
+* @since S60 5.0
+*/
+class MSensrvChannelListener
+    {
+    public:
+
+    /**
+    * Callback implemented by a client so that they can be notified when channels are added
+    * or removed from the system when new software is installed or uninstalled.
+    * 
+    * Clients providing an implementation for this callback must ensure that the operation does
+    * not leave. If a leave does occur then the behaviour is undefined.
+    * 
+    * @since S60 5.0
+    * @param aDetectedChannel Information for the channel that has been added or removed
+    * @param  aChangeType If ESensrvChannelAdded, channel is a newly available channel.
+    * If ESensrvChannelRemoved, channel has been removed and is no longer available.
+    */
+    virtual void ChannelChangeDetected( const TSensrvChannelInfo& aDetectedChannel,
+                                        TSensrvChannelChangeType aChangeType ) = 0;
+
+    /**
+    * Callback implemented by a client so that they can be notified when channel listening
+    * has failed. If the error is fatal the sensor server session has been terminated and
+    * the channel finder is no longer useable. If the error is minor some notifications have
+    * potentially been lost, however listening is still active.
+    * 
+    * Clients providing an implementation for this callback must ensure that the operation does
+    * not leave. If a leave does occur then the behaviour is undefined.
+    * 
+    * @since S60 5.0
+    * @param  aChannelFinder Reference to the related channelfinder object
+    * @param  aError The error severity
+    */
+    virtual void ChannelDetectionError( CSensrvChannelFinder& aChannelFinder,
+                                        TSensrvErrorSeverity aError ) = 0;
+
+    /** 
+    * Callback to future proof this API so that additional callbacks can be added in the future 
+    * without breaking binary compatibility.
+    * 
+    * @since S60 5.0
+    * @param  aInterfaceUid Identifier for the interface to be retrieved
+    * @param  aInterface A reference to a pointer for the specified interface. Implementation sets
+    * aInterface to a valid pointer if the M-class identified by aInterfaceUid is supported, otherwise
+    * it is set to NULL on exit.
+    * @leave  One of the system-wide error codes
+    */
+	virtual void GetChannelListenerInterfaceL( TUid aInterfaceUid, TAny*& aInterface ) = 0;
+
+    };
+
+
+
+#endif //SENSRVCHANNELLISTENER_H
+
+// End of File
+