videocollection/hgmyvideos/inc/vcxhgmyvideosupnpinterface.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 22:52:52 +0200
branchRCL_3
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:      CVcxuPnPInterface class declaration*
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*/
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#ifndef CVCXHGUPNPINTERFACE_H
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#define CVCXHGUPNPINTERFACE_H
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// INCLUDE FILES
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#include <e32std.h>
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#include <e32base.h>
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#include <upnpcommandobserver.h>
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// FORWARD DECLARATIONS
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class CUpnpShowCommand;
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// CLASS DECLARATION
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/**
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 * CVcxHgMyVideosUPnPInterface declares an interface for myvideos UI 
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 * to show videos and images via upnp framework's command api
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 * 
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 */
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NONSHARABLE_CLASS( CVcxHgMyVideosUPnPInterface ) : public CBase,
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                                                   public MUpnpCommandObserver
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    {
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public: // Constructors and destructor
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    /**
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     * Destructor.
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     */
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    ~CVcxHgMyVideosUPnPInterface();
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    /**
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     * Two-phased constructor.
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     * 
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     * @param aExtObserver pointer to external command observer
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     */
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    static CVcxHgMyVideosUPnPInterface* NewL( MUpnpCommandObserver* aExtObserver = 0 );
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    /**
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     * Two-phased constructor.
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     * 
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     * @param aExtObserver pointer to external command observer
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     */
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    static CVcxHgMyVideosUPnPInterface* NewLC( MUpnpCommandObserver* aExtObserver = 0 );
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public: // new methods
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    /**
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     * Returns ETrue, if home network functionality
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     * is usable via upnp
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     * 
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     * @return TBool ETrue is usable
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     */
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    TBool IsApplicable();
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    /**
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     * Returns ETrue, upnp has been started succesfully
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     * by the Strat() -call
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     * 
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     * @return TBool ETrue if started
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     */
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    TBool IsStarted();
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    /**
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     * Starts upnp framework for video / image showing
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     * 
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     * @return TInt     KErrNone if ok, KErrGeneral if start is not yet called 
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     *                  succesfully. Otherwise a systemwide error code.
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     */
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    TInt Start( );
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    /**
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     * Shows a video in remote upnp device.
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     * 
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     * @param aVideoPath full path for the video including video file name
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     * 
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     * @return TInt     KErrNone if ok, KErrGeneral if start is not yet called 
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     *                  succesfully. Otherwise a systemwide error code.
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     */
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    TInt ShowVideo( const TDesC& aVideoPath );
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    /**
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     * Shows an image in remote upnp device.
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     * 
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     * @param aPath full path for the image including image file name
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     * 
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     * @return TInt KErrNone if ok, other a systemwide error
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     */
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    TInt ShowThumbnail( const TDesC& aPath );
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    /**
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     * Notifies framework to stop showing
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     * 
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     * @return TInt KErrNone if ok, otherwise a systemwide error
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     */
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    TInt Stop();
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public: // from MUpnpCommandObserver
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    /**
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     * Upnp framework calls this to return a result from 
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     * Asynchronous method -calls. Only async methods are the one 
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     * related to showing of image of video. In case there is external
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     * observer defined, message is to it.
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     * This method handles only KErrDisconnected status, where 
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     * we set iStarted flag EFalse. 
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     * 
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     * @param aStatusCode  statuscode from the upnp framework
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     */
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    void CommandComplete( TInt aStatusCode );
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private:
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    /**
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     * Constructor for performing 1st stage construction
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     */
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    CVcxHgMyVideosUPnPInterface();
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    /**
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     * EPOC default constructor for performing 2nd stage construction
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     */
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    void ConstructL();
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    /**
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     * Method creates CUpnpShowCommand object if not yet created.
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     * Creation unsuuceeds, if platform does not yet support home networking
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     * via upnp (Home media setup not yet done). In this case pointer to
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     * CUpnpShowCommand remains NULL.  
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     * 
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     * @return TBool  ETrue, creation ok
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     */
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    TBool TryCreateCmd();
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private:
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    /**
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     * pointer to Upnp Show -command interface. Owned.
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     */
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    CUpnpShowCommand* iShowCommand;
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    /**
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     * pointer to external Upnp command observer. Not Owned.
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     */
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    MUpnpCommandObserver* iExtObserver;
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    /**
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     * ETrue:  Start has been called succesfully.
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     * EFalse: Start not yet called succesfully
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     */
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    TBool iStarted;
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    };
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#endif // CVCXHGUPNPINTERFACE_H