author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Tue, 20 Jul 2010 12:00:49 +0100 | |
changeset 13 | 48780e181b38 |
parent 7 | 51a74ef9ed63 |
permissions | -rw-r--r-- |
13
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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parents:
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<?xml version="1.0" encoding="utf-8"?> |
48780e181b38
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<!-- This component and the accompanying materials are made available under the terms of the License |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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"Eclipse Public License v1.0" which accompanies this distribution, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<!-- Initial Contributors: |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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Nokia Corporation - initial contribution. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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Contributors: |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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parents:
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--> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<!DOCTYPE concept |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<concept id="GUID-310A8A9C-98E7-59EE-9376-8E572580190F" xml:lang="en"><title>File services in Symbian platform</title><shortdesc>This topic describes the common concepts of file systems |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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and files used by Symbian platform.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<p>Like other software systems, Symbian platform can store data so |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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that it is kept when a handset is powered down. </p> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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<p>On PCs, a file is kept on magnetic disk or optical media such as |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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CD or DVD. On older generations of personal organisers, a file was |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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often kept in RAM, needing a permanent power supply, and a backup |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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battery to guarantee this. On the most recent telephone handsets, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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files are normally stored in flash memory, either NOR flash or NAND |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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flash, and also on removable devices such as MultiMediaCard (MMC), |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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Secure Digital card (SD card), Memory Stick or Compact flash (CF). </p> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<p>There are more sophisticated services for persisting data such |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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as streams, stores, central repository etc. that applications can |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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use, but they all rely, either directly or indirectly, on the commonly |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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understood idea of the file. </p> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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<p>The ROM on a typical handset is located in non-volatile flash memory, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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allowing it to be upgraded by the handset manufacturer after initial |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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parents:
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production. The location for user data is almost always flash memory |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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(NAND or NOR), on the grounds of cost, although rotating media devices |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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capable of holding large amounts of data are likely in future handsets. </p> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-798E9ED1-24DF-5990-9D1E-CD043B94B722"><p> <xref href="GUID-310A8A9C-98E7-59EE-9376-8E572580190F.dita#GUID-310A8A9C-98E7-59EE-9376-8E572580190F/GUID-DD8C4BFB-9816-5EA5-A9F2-5146C64BBC9C">Basic concepts</xref> </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-BBB6D4C2-4AE6-55CD-BC65-416BCF705F31"><p> <xref href="GUID-310A8A9C-98E7-59EE-9376-8E572580190F.dita#GUID-310A8A9C-98E7-59EE-9376-8E572580190F/GUID-62387DD0-D8E4-5426-8432-B14696291AF8">Accessing file services</xref> </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-B6AEF9DA-60D3-5728-9C46-59EE5C98346C"><p> <xref href="GUID-310A8A9C-98E7-59EE-9376-8E572580190F.dita#GUID-310A8A9C-98E7-59EE-9376-8E572580190F/GUID-9FF4525A-EBFD-5E9F-BD86-C6B75E5C35EF">Security issues</xref> </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-ACF583E3-3FAA-52FE-9A07-8172A4BBBCC9"><p> <xref href="GUID-310A8A9C-98E7-59EE-9376-8E572580190F.dita#GUID-310A8A9C-98E7-59EE-9376-8E572580190F/GUID-849F5D6E-7911-55F8-839A-019D1BF16726">File systems and mounting a drive</xref> </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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</ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<section id="GUID-DD8C4BFB-9816-5EA5-A9F2-5146C64BBC9C"><title>Basic |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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concepts</title> <p>Symbian platform uses a number of file concepts |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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that are common to most operating systems, for example, drives and |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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directories. </p> <p><b>Drives</b> </p> <p>Symbian platform uses the concept of the <i>drive</i>. This idea is similar to that in other operating systems, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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i.e. it corresponds to a logical device. A media device such as a |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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MultiMediaCard can be logically split into partitions, and each partition |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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is treated as a separate drive. Symbian platform adopts a DOS-like |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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convention where each drive is identified by a single letter. This |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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means that there can be up to 26 drives on a handset, identified by |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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the letters <filepath>A:</filepath> through to <filepath>Z:</filepath>. In practice, there are far fewer than this, and the number depends |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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on the individual manufacturer's handset </p> <p>Internally, Symbian |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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platform uses the idea of a drive number instead of a letter, and |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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some legacy API items take a drive number as input, or return a drive |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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number as output. However, there are functions that can translate |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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drive numbers to and from drive letters: <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita#GUID-E263C747-946F-35AA-9F1D-41833BD350FC/GUID-A0F50C51-A4F0-33C1-BBD4-757DEC4B7F2E"><apiname>RFs::DriveToChar()</apiname></xref> and <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita#GUID-E263C747-946F-35AA-9F1D-41833BD350FC/GUID-D545B868-0549-37A9-AACE-288E7C9CE8C3"><apiname>RFs::CharToDrive()</apiname></xref>. </p> <p>The main ROM |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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on a handset is always identified as the <filepath>Z:</filepath> drive. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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Other drives may be in use: sixteen of the drives <filepath>C:</filepath> to <filepath>R:</filepath> are usually reserved as local drives, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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i.e. for media devices located within the handset. A common convention |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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is to adopt <filepath>C:</filepath> as the main user data drive. and |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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to designate <filepath>D:</filepath> or <filepath>E:</filepath> as |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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drives for removable media. <i>Be aware</i>, however, that this is |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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a convention that some handset manufacturers may not follow, so you |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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are always advised to check the full SDK that applies to a specific |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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handset for guidance. Indeed, as a matter of principle, you should |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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always use the <xref href="GUID-629AB2C9-BEDD-5166-8B09-F8DFF7527C03.dita">system drive</xref> for user data. </p> <p><b>Volume</b> </p> <p>The concept of the volume applies to removable |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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media. As users insert and remove individual devices, so different |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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volumes are said to be mounted and demounted. For media types that |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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can be split into partitions, each partition corresponds to a separate |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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volume. </p> <p><b>File names and directory structures</b> </p> <p>Files have names, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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and Symbian platform uses a hierarchical directory structure in which |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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to organize them; this is similar to schemes adopted by other operating |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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systems. For example: </p> <codeblock id="GUID-C4330879-E93B-5939-A810-8D4A1E5B14DB" xml:space="preserve">C:\AAA\BBB\CCC\DDD.EXT</codeblock> <p>There are four main parts to the structure: </p> <ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-39D18587-8793-511F-B3CC-8CFA6D129F80"><p>the <i>drive</i>; this is always at the top of the hierarchy, and is represented |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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by a drive letter and a colon. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-8F5F5EB0-721F-5C5B-90B6-08E2CB92BA98"><p>the <i>path</i>; this is a list of names, each name representing a level in the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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hierarchy. Each directory name is separated by a back slash character, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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and the last directory name is always terminated by a back slash character. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-BD848A50-9BEA-5E08-ACDB-92EDB9C5CA86"><p>the <i>filename</i>; this is everything after the final backslash, and before the dot |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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if there is a file extension. Symbian platform supports long file |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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77 |
filenames. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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78 |
<li id="GUID-07E1D5CB-9D9B-5141-AD7B-76F839AA2FC0"><p>the <i>extension</i>, everything after the final dot. There is no restriction on the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
79 |
length of the extension; limits on length apply to the whole structure, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
80 |
not to any single part of it. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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81 |
</ul> <p>You will find that the whole structure is sometimes referred |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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82 |
to as the full file name or the full path name. The maximum length |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
83 |
of a full file name is limited to 256 characters. Symbian platform |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
84 |
does not use the extension to identify the software or application |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
85 |
that can access the data. Instead, files have UIDs embedded within |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
86 |
them, and the mapping of files to applications is done through these |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
87 |
UIDs. For more information, see <b>Symbian^3 Tools Guide > Building</b>.</p> <p>The case of full path names is always preserved, but operations |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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changeset
|
88 |
on names are case insensitive. This means that two files that have |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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changeset
|
89 |
the same name but differ only in case are considered to refer to the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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changeset
|
90 |
same file. </p> <p>Full file names are normally manipulated programmatically. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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changeset
|
91 |
Extracting drive names, filenames, file extensions, and changing the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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changeset
|
92 |
names of a directory structure are typical activities. Symbian platform |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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93 |
provides you with the <xref href="GUID-E79A3B03-F8CB-37DB-A2A8-1C6C4E4D739A.dita"><apiname>TParse</apiname></xref>, <xref href="GUID-A6268E58-68EC-3041-93FD-5368CD230947.dita"><apiname>TParsePtr</apiname></xref>, and <xref href="GUID-C65BCDAB-0476-3EAC-9BFC-37243AE43FE9.dita"><apiname>TParsePtrC</apiname></xref> classes to help you do this manipulation. </p> <p>See <xref href="GUID-ECF9E432-EA93-5284-B0E6-A1211289CBD8.dita">parsing |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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94 |
paths and filenames</xref> . </p> </section> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
95 |
<section id="GUID-62387DD0-D8E4-5426-8432-B14696291AF8"><title>Accessing |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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96 |
file services</title> <p>On Symbian platform, file services are a |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
97 |
common resource. Like other common or shared resources on Symbian |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
98 |
platform, file services are handled by a server - the file server. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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99 |
Applications and other software that require access to files, directories |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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100 |
and drives are clients of the file server, and send file-related requests |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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101 |
using the <xref href="GUID-198DCED1-F429-5C95-A51D-53AE416687E8.dita">file |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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102 |
server client-side API</xref>. </p> <p>The file server is multithreaded, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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103 |
which allows each logical drive to be accessed concurrently. More |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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|
104 |
than one request can be issued for the same drive, but these requests |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
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changeset
|
105 |
are handled sequentially. For example, a request to read or write |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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106 |
data to a MultiMediaCard can be handled at the same time as a request |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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107 |
to read or write data to the main user drive. </p> <p>The file server |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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108 |
has a main thread that initially handles all requests. Short requests, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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109 |
such as those that require access to the ROM drive, and those that |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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110 |
do not require access to any media, run in the file server. </p> <p>The services provided by the file server can be divided into two |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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111 |
types: </p> <ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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112 |
<li id="GUID-12F7606D-835D-5948-B0F0-EBACC5F6E569"><p>those that give |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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113 |
you access to individual files, directories and drives using the <xref href="GUID-BE0804F6-4375-3C8A-8C83-968F510466E0.dita"><apiname>RFile</apiname></xref>, <xref href="GUID-12AE154F-7741-38C0-ADFE-9784FCF5E516.dita"><apiname>RDir</apiname></xref> and <xref href="GUID-9D7E765B-6872-3EB9-9D5B-1503FA466EC1.dita"><apiname>RFormat</apiname></xref> classes. </p> <p>See also <xref href="GUID-30B2AF3F-E120-5D47-AAA2-529555625B55.dita">How to use sessions, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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114 |
files, and directories</xref>. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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115 |
<li id="GUID-9E40CF33-C35E-52CE-80B9-8A019F34F305"><p>those that allow |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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116 |
you to do higher level longer running operations such as moving, copying |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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117 |
and deleting files, using the <xref href="GUID-82CEC14F-1479-3922-846A-9FCDB6465EF7.dita"><apiname>CFileMan</apiname></xref> class, scanning |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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118 |
directory trees using the <xref href="GUID-C657AF2D-1183-3CD2-ACAF-3B0B00FC91BB.dita"><apiname>CDirScan</apiname></xref> class, and tracking |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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119 |
the progress of these operations using the <xref href="GUID-E608485F-B3E3-3310-A80E-169D8B9D2234.dita"><apiname>MFileManObserver</apiname></xref> class. </p> <p>See also <xref href="GUID-ACF6C0A2-87ED-55B3-B22A-9B331D9940AC.dita">File management and |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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120 |
searching</xref>. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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121 |
</ul> <p>Like most other servers, the client API allows you to make |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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122 |
file requests synchronously or asynchronously. </p> <p>See also <xref href="GUID-6047DB3F-DC92-51DF-9EEB-00E79E890B54.dita">client-server</xref>. </p> </section> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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123 |
<section id="GUID-9FF4525A-EBFD-5E9F-BD86-C6B75E5C35EF"><title>Security |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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124 |
issues</title> <p>Security considerations restrict the parts of a |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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125 |
handset's directory structure that an application is allowed to access. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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126 |
The concept is referred to as <i>data caging</i>. </p> <p>There are |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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127 |
a number of principles involved: </p> <ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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128 |
<li id="GUID-21674EE5-40A3-5F71-9973-C089FD838585"><p>The fundamental |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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129 |
principle is the separation of executable code from data. Executable |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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130 |
code can only reside in the <filepath>/sys/bin/</filepath> directory. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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131 |
Executables cannot be loaded from any location other than <filepath>/sys/bin/</filepath>. Unless an application has the appropriate system |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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132 |
capabilities, the <filepath>/sys/</filepath> directory is not visible |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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133 |
to that application. System capabilities are a discrete set of 'permissions' |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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134 |
that give access to various sensitive system services, and which can |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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135 |
only be granted to applications, if justified, through the <xref href="https://www.symbiansigned.com/app/page" scope="external">Symbian |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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136 |
Signed</xref> scheme. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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137 |
<li id="GUID-4A1854CE-25CB-5630-A27C-73931D937567"><p>Applications |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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138 |
have their own private directory, under which they are free to create |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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139 |
further directory structures and files, and to write to those files. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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140 |
This is the directory structure <filepath>/private/<app_SID>/</filepath>. <i><app_SID></i> is known as a secure identifier and, in general, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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141 |
is used when verifying an executable's rights of access to system |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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142 |
resources. Here, it is used to form the path name for the executable's |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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143 |
private directory. The secure identifier is a UID which is allocated |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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144 |
to a developer through the <xref href="https://www.symbiansigned.com/app/page" scope="external">Symbian |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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145 |
Signed</xref> scheme, and is guaranteed to be unique within the handset |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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146 |
on which the application is installed. The UID is coded into the <filepath>mmp</filepath> file(s) that define the application's source files, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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147 |
link requirements, and general characteristics. </p> <p>Other applications |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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148 |
have no right of access to an application's private directory. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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149 |
<li id="GUID-2814D086-A660-5294-9952-E6D66243B652"><p>There is a directory <filepath>/resource/</filepath> to which all applications have read access, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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150 |
but no write access. The purpose of this directory is to conatin common |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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151 |
read-only files. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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152 |
<li id="GUID-FC6EE81A-59FA-5AC5-8EC4-3034597F8829"><p>All other directories |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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153 |
are accessible for both reading and writing. This allows the use of |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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standard file system hierarchies that may be available on removable |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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media. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<li id="GUID-95121831-873B-5E79-B07C-410858FC9779"><p>The above principles |
48780e181b38
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apply regardless of the drive. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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</ul> <p>It is possible to pass an open file to another process, or |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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between a client and server, so that the target can access the file |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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without knowing the full path name. The only information that is passed |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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to the target is the filename and extension. </p> </section> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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<section id="GUID-849F5D6E-7911-55F8-839A-019D1BF16726"><title>File |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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systems and mounting a drive</title> <p>The varying characteristics |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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of media types can mean that different media types require different |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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formats. A common format is VFAT, and typically, this is used for |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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removable media to maintain compatibility with other systems. This |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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also means that long file names are supported. </p> <p>In Symbian |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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platform, format schemes are implemented by what are called file systems; |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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they are constructed as plugins to the file server. This means that |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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the file server itself is independent of the format scheme, and also |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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means that a phone manufacturer is free to add new file systems to |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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a handset. The ROM is an exception - it has its own file system built |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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into the main file server code. </p> <p>A file system must be associated |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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with a drive before the drive can be used. This is known as mounting |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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the drive, and is typically done at system boot time. </p> <p>In practice, |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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an application does not need to concern itself with the format scheme. </p> </section> |
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</conbody></concept> |