author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 3 | 46218c8b8afa |
permissions | -rw-r--r-- |
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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-C85B4EA2-0184-52AF-B097-152E4A023CEF" xml:lang="en"><title>Abstract |
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base descriptor classes</title><shortdesc>Describes the modifiable descriptor class and the non-modifiable |
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descriptor class.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The concrete descriptor classes are all derived from a set of base classes. |
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The base classes are abstract and implement nearly most of the behaviour of |
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descriptors. They are:</p> |
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<ul> |
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<li id="GUID-0942F246-8BB5-50DB-8314-AA4B1DD1B8C0"><p>The abstract non-modifiable |
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descriptor</p> </li> |
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<li id="GUID-1750CF5B-E6F3-57E5-A107-B17DA0481E22"><p>The abstract modifiable |
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descriptor</p> </li> |
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</ul> |
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<section id="GUID-136970EE-DFB5-469F-9597-1105AA05947E"><title>The abstract non-modifiable descriptor class</title> <p>The |
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class has a data member containing the length of the data represented by the |
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serived concrete descriptor. It also provides the set of functions through |
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which data can be accessed but not modified.</p> <p>This class is supplied |
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in two variants:</p> <ul> |
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<li id="GUID-669B11F1-84DA-5064-88B8-5D3F603114F6"><p>the 16 bit variant, |
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a <codeph>TDesC16</codeph>, to handle Unicode strings.</p> </li> |
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<li id="GUID-A9F1113E-0736-570D-BF57-B060817549C8"><p>the 8 bit variant, a <codeph>TDesC8</codeph>, |
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to handle non-Unicode strings and binary data.</p> </li> |
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</ul> <p>There is also a build independent type, <codeph>TDesC</codeph>. This |
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is the type which is most commonly used in program code; the appropriate variant |
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is selected at build time.</p> <p>An explicit 8 bit variant is chosen when |
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handling binary data. The explicit 16 bit variant is rarely used.</p> </section> |
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<section id="GUID-DA165923-2587-4F77-AEAF-FA012B7EAC24"><title>The abstract modifiable descriptor class</title> <p>The class |
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has a data member containing the maximum length of data that the descriptor |
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is capable of representing. It also provides the set of functions through |
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which data can be modified.</p> <p>This class is supplied in two variants:</p> <ul> |
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<li id="GUID-3F876EFE-1E91-5834-914A-45478D70B0A7"><p>the 16 bit variant, |
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a <codeph>TDes16</codeph>, to handle Unicode strings.</p> </li> |
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<li id="GUID-1F1F3894-3CD0-5DEB-AA75-8259CC86BF58"><p>the 8 bit variant, a <codeph>TDes8</codeph>, |
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to handle non-Unicode strings and binary data.</p> </li> |
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</ul> <p>There is also a build independent type, <codeph>TDes</codeph>. This |
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is the type which is most commonly used in program code; the appropriate variant |
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is selected at build time.</p> <p>An explicit 8 bit variant is chosen when |
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handling binary data. The explicit 16 bit variant is rarely used.</p> </section> |
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</conbody></concept> |