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Adaptation/GUID-2559E3F7-314B-5DCC-A7FE-A08162A89721.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-2559E3F7-314B-5DCC-A7FE-A08162A89721" xml:lang="en"><title>Local
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Media Subsystem Overview</title><shortdesc>Provides the logical device driver for the internal and removable
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storage media on a phone. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-F7C4ED03-1A25-4F13-8B48-8A5463510422"><title>Purpose</title> <p>The local media sub-system allows the Symbian
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platform file system and other programs to communicate with local media devices. </p> </section>
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<section id="GUID-80F9C844-882C-4EA4-85C4-58D62C11685A"><title>Required background</title> <p>The local media sub-system
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requires an understanding of the Symbian platform file system and local media
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devices. </p> </section>
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<section id="GUID-E70E10E5-2676-4C0F-B28B-060F823DECCF"><title>Key concepts and terms</title> <dl>
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<dlentry>
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<dt>local drive</dt>
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<dd><p>A media drive mounted within the phone. </p> </dd>
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</dlentry>
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</dl> </section>
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<section id="GUID-08F96B25-71FA-4A62-A77B-5076F509AE23"><title>Architecture</title> <p>The <xref href="GUID-32659A02-6541-3D15-AB88-B70FBD7DF9B0.dita"><apiname>TBusLocalDrive</apiname></xref> class
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provides an interface to the local media sub-system. Each instance of this
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class represents a channel of communication with a local drive. To establish
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a channel a client connects an instance of the class to a specified drive.
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The file server contains 16 instances of <xref href="GUID-32659A02-6541-3D15-AB88-B70FBD7DF9B0.dita"><apiname>TBusLocalDrive</apiname></xref>,
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one for each local drive. Programs other than the file server may also create
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instances to access a local drive. Drives are abstracted by the <xref href="GUID-2E1AEAC0-CEDF-31A5-B36A-FC4749B979A5.dita"><apiname>TDrive</apiname></xref> class. </p> </section>
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<section id="GUID-3495E8DD-C6AA-47D3-A64F-4431C2A90850"><title>Local Media Sub-system Summary</title> <p>The local media
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subsystem provides the following: </p> <ul>
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<li id="GUID-79E68BE5-9713-5E24-B3C6-D0123CD13056"><p> <b>Local media LDD</b>  </p> <p> <filepath>elocd.ldd</filepath>  </p> <p>The
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kernel-side logical device driver which implements communication between physical
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devices and applications which use them. </p> </li>
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</ul> </section>
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<section id="GUID-74061F49-2659-47D1-9DB8-2FF3CB10B2E8"><title>Typical uses</title> <p>The <xref href="GUID-32659A02-6541-3D15-AB88-B70FBD7DF9B0.dita"><apiname>TBusLocalDrive</apiname></xref> class
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is used to connect to and disconnect from local drives, to read to and write
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from them, to provide information about the capabilities of the drives, to
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format them, and to mount and remount drives on specified media drivers. </p> <p>Local
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media subsystem: </p> <ul>
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<li id="GUID-1A411257-57A7-5206-AE12-811B5F71727A"><p>Manages device connections </p> </li>
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<li id="GUID-74C8A86A-D797-5473-8192-A4EA6DE1C8B0"><p>Manages data transfer </p> </li>
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<li id="GUID-5D62718F-3B7F-5D0E-9B95-BDA2C1FB77D3"><p>Handles notifications
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and device configuration. </p> </li>
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</ul> </section>
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</conbody><related-links>
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<link href="GUID-F3BD37EC-0CCB-5859-908F-215E22C9FC20.dita#GUID-F3BD37EC-0CCB-5859-908F-215E22C9FC20/GUID-143780ED-4A23-5E72-A923-F605172EC8B5">
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<linktext>File Server</linktext></link>
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<link href="GUID-6CF2F4EF-383F-5850-A522-F425A83AA89E.dita#GUID-6CF2F4EF-383F-5850-A522-F425A83AA89E/GUID-20E09BC9-35CA-594A-BA91-D8D0C928FD98">
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<linktext>File Systems</linktext></link>
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<link href="GUID-9540A82E-F83D-55F5-B441-868CF77468E9.dita#GUID-9540A82E-F83D-55F5-B441-868CF77468E9/GUID-CFED15B1-E768-534E-9043-7AADE45EE9AF">
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<linktext>Media Drivers</linktext></link>
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</related-links></concept>
MCL/sftools/depl/docscontent