videocollection/hgmyvideos/inc/CIptvDriveMonitor.h
author Fionntina Carville <fionntinac@symbian.org>
Mon, 15 Nov 2010 11:50:30 +0000
branchRCL_3
changeset 73 f89a65650939
parent 10 ce5ada96ab30
permissions -rw-r--r--
Bug 3539. Update localisation mappings for videoplayer.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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* Copyright (c) 2010 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:    Helper class for Video Center for drive operations/monitoring.*
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*/
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#ifndef CIPTVDRIVEMONITOR_H
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#define CIPTVDRIVEMONITOR_H
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//  INCLUDES
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#include <e32base.h>
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#include <f32file.h>
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#include "TIptvDriveInfo.h"
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#include "TIptvDriveMonitorEvent.h"
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#include "MIptvDriveMonitorObserver.h"
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#include "IptvDebug.h"
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// CONSTANTS
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// MACROS
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// DATA TYPES
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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// CLASS DECLARATION
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/**
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 * Helper class for Video Center for drive operations/monitoring.
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 * User can get available drives (through iAvailableDrives public member)
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 * and be notified when drives change (through MIptvDriveMonitorObserver interface).
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 */
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NONSHARABLE_CLASS (  CIptvDriveMonitor ) : public CActive
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    {                
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        */
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        static CIptvDriveMonitor* NewL();
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        /**
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        * Two-phased constructor. Use this is owner object already has a file session open.
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        *
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        * @param aFileSession file session.
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        */
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        static CIptvDriveMonitor* NewL( const RFs& aFileSession );
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        /**
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        * Destructor.
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        */
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        virtual ~CIptvDriveMonitor();
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    public:
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        /**
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        * Registers observer for drive events.
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        * iAvailableDrives is updated automatically if there are any
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        * observers registered, ie there is no need to call RefreshAvailableDrivesL
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        * when observing.
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        * Don't keep observers around if they do not need events. Observing should be used
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        * when user needs to know immedetially about memory card insertion/removed events,
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        * or drive locked/unlocked events.
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        *
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        * @param aObserver observer, ownership does not move.
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        */
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        void RegisterObserverL( MIptvDriveMonitorObserver* aObserver );
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        /**
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        * Removes observer, ownership does not move.
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        * @param aObserver observer to be removed from observers list.
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        */ 
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        void RemoveObserverL( MIptvDriveMonitorObserver* aObserver );
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        /**
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        * Updates iAvailableDrives member variable from File server.
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        * This is called in ConstructL() also.
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        */ 
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        void RefreshAvailableDrivesL();
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        /**
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        * Returns the position index of aDrive in iAvailableDrives.
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        *
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        * @param aDrive drive to search.
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        * @return Position index of aDrive in iAvailableDrives. If not found,
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        *         KErrNotFound is returned.
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        */        
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        TInt ArrayPos( TInt aDrive );
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        /**
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        * Returns the position index of aDrive in iAvailableDrives. If not
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        * found, leaves with KErrNotFound code.
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        *
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        * @param aDrive drive to search.
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        * @return Position index of aDrive in iAvailableDrives.
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        */        
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        TInt ArrayPosL( TInt aDrive );
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        /**
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        * Returns the default removable drive (= memory card drive) from iAvailableDrives
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        * array. Leaves with KErrNotFound if not found.
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        */        
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        TInt MemoryCardDriveL();
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        /**
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        * Returns the default removable drive (= memory card drive) from iAvailableDrives
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        * array. Returns KErrNotFound if not found.
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        *
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        * @return drive number, or KErrNotFound if not found.
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        */        
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        TInt MemoryCardDrive();
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        /**
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        * Returns the default mass memory drive if found from iAvailableDrives.
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        * Mass storege drive means the drive which is preferred for storing large
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        * files in the device, the drive itself can be anything, usually not c though.
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        * Leaves with KErrNotFound if not found.
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        *
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        * @return Drive number.
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        */
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        TInt MassStorageDriveL();
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        /**
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        * Returns the default mass memory drive if found from iAvailableDrives.
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        * Mass storege drive means the drive which is preferred for storing large
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        * files in the device, the drive itself can be anything except c-drive.
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        * Returns KErrNotFound if not found.
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        *
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        * @return Drive number, or KErrNotFound if not found.
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        */
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        TInt MassStorageDrive();
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        /**
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        * Returns the phone memory drive from iAvailableDrives array.
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        * Leaves with KErrNotFound if not found.
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        *
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        * @return Drive number.
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        */
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        TInt PhoneMemoryDriveL();
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        /**
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        * Returns the PhoneMemory drive from iAvailableDrives array.
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        * Returns KErrNotFound if not found.
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        *
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        * @return Drive number, or KErrNotFound if not found.
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        */
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        TInt PhoneMemoryDrive();
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        /**
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        * Returns the first fixed (= non removable) drive from iAvailableDrives array.
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        * Leaves with KErrNotFound if not found.
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        *
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        * @param aExcludeCDrive If ETrue, then C-drive is excluded.
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        * @return Drive number.
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        */
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        TInt FixedDriveL( TBool aExcludeCDrive );
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        /**
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        * Returns the first fixed (= non removable) drive from iAvailableDrives array.
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        * Returns KErrNotFound if not found.
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        *
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        * @param aExcludeCDrive If ETrue, then C-drive is excluded.
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        * @return Drive number, or KErrNotFound if not found.
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        */
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        TInt FixedDrive( TBool aExcludeCDrive );
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        /**
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        * @return ETrue if aDrive is the preferred mass storage drive for the large files.
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        */
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        TBool IsMassStorageDriveL( TInt aDrive );
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        /**
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        * @return ETrue if aDrive is memory card type.
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        */
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        TBool IsMemoryCardDriveL( TInt aDrive );
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        /**
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        * @return ETrue media is present in the drive. (Memory card is inserted and drive is not locked).
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        */
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        TBool IsPresentL( TInt aDrive );
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        /**
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        * @return The system drive. Might not be in iAvailableDrives.
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        */
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        TInt SystemDrive();
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        /**
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        * Finds out if memory card is inserted and not locked.
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        *
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        * @return Returns ETrue is memory card is inserted and usable (not locked), EFalse otherwise.
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        */
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        TBool IsMmcInserted();
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        /**
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        * Gets the used memory from cenrep. If cenrep contains invalid drive or value is not found,
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        * chooses the preferred drive in the following order: 1. mass storage 2. memory card
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        * 3. EDriveC. If cenrep value was not usable, the chosen drive is written to cenrep.
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        * Leaves with system-wide error code if wasn't able to get the used memory.
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        *
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        * @param aUsedMemory The used memory drive is written here.
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        */        
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        void GetUsedMemoryL( TInt& aUsedMemory );
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    protected: // Functions from base classes
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        /**
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        * From CActive, RunL.
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        * Called when operation completes.
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        */
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        void RunL();
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        /**
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        * From CActive, cancels request.
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        */
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        void DoCancel();
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        /**
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        * From CActive, handles leaves from RunL.
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        */
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        TInt RunError( TInt aError );
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    private:
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        /**
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        * C++ default constructor.
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        */
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        CIptvDriveMonitor();
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL();
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        *
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        * @param aFileSession
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        */
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        void ConstructL( const RFs& aFileSession );
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        /**
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        * Sends event to observers.
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        *
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        * @param aEvent event to send.
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        * @param aDrive drive which caused the event.
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        */
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        void SendEvent( TIptvDriveMonitorEvent::TEvent aEvent, TInt aDrive );
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        /**
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        * Compares iPreviousAvailableDrives and iAvailableDrives arrays and
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        * sends appropriate events if they differ.
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        */
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        void CompareOldAndNewAvailableDrives();
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        /**
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        * Returns drive type as a descriptor. For debugging only.
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        * @param aType Drive type, see valid values from e32const.h TMediaType enum.
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        */
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        const TDesC& DriveTypeDes( TInt aType );
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        /**
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        * Prints available drives. For debugging only.
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        */
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        void PrintAvailableDrives();
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    public:
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        /**
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        * Array of currently available drives. These are updated
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        * with RefreshAvailableDrivesL -method or from file
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        * server event. RefreshAvailableDrivesL is also called upon creation
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        * of this object.
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        * iAvailableDrives array contains drives which are available for mass
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        * storaging videos. If there is hard disk and memory card
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        * available(both e and f-drives), then c-drive is excluded from the array.
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        */
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        RArray<TIptvDriveInfo> iAvailableDrives;
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    private:
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        /**
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        * Used to detect if refresh had any effect.
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        */
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        RArray<TIptvDriveInfo> iPreviousAvailableDrives;
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        /**
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        * Array of observers. Pointers not owned.
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        */
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        RArray<MIptvDriveMonitorObserver*> iObservers;
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        /**
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        * Session to file server.
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        */
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        RFs iFs;
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        /**
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        * ETrue if iFs is provided by the user of this class.
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        */
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        TBool iIfsIsProvidedByUser;
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        /**
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        * Default memory for storing large files.
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        */
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        TInt iDefaultMassStorageDrive;
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        /**
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        * Default memory card.
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        */
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        TInt iDefaultMemoryCardDrive;
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        /**
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        * System drive.
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        */
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        TInt iSystemDrive;
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    };
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#endif      // CIPTVDRIVEMONITOR_H   
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// End of File