author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
0
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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-2DDAAD1C-D9EB-5741-B6AE-2383646E0EDB" xml:lang="en"><title>Pointer |
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descriptors</title><shortdesc>Describes non-modifiable pointer descriptors and modifiable pointer |
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descriptors.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>A pointer descriptor represents data which can live in ROM or RAM and this |
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location is separate from the pointer descriptor object itself. </p> |
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<p>A pointer descriptor is an instance of a class that encapsulates a pointer |
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to the location of the data. </p> |
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<p>A pointer descriptor comes in two forms: </p> |
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<ul> |
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<li id="GUID-A836665F-9AB7-5364-891E-6297D68B291D"><p>a non-modifiable pointer |
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descriptor. </p> </li> |
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<li id="GUID-C46BB0C8-08ED-5835-9516-D164383D1313"><p>a modifiable pointer |
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descriptor. </p> </li> |
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</ul> |
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<section id="GUID-DE207726-9C75-4DD9-964A-6B7B16226C4A"><title>Non-modifiable pointer descriptor</title> <p>The data represented |
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by a non-modifiable pointer descriptor can be accessed, but not changed, through |
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this descriptor. </p> <p>Data is accessed through functions provided by the |
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base class. </p> <p>A non-modifiable pointer descriptor is supplied in two |
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variants: </p> <ul> |
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<li id="GUID-CF4D06B5-B5EB-5C4D-BA87-B990053CD15D"><p>the 16 bit variant, |
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a <codeph>TPtrC16</codeph>, for representing Unicode strings. </p> </li> |
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<li id="GUID-A1005460-2D2A-5DB4-9414-2747056A7DBC"><p>the 8 bit variant, a <codeph>TPtrC8</codeph>, |
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for representing non-Unicode strings and binary data. </p> </li> |
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</ul> <p>There is also a build independent type, <codeph>TPtrC</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 for |
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binary data. The explicit 16 bit variant is rarely used. </p> <p>The base |
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class, <codeph>TDesC</codeph>, contains a data member which holds the length |
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of the data. The following drawing shows the layout of a <codeph>TPtrC</codeph> object |
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for a string of five characters representing the English word "Hello". </p> <fig id="GUID-D3F0600A-D575-5309-8182-CFA98D184E29"> |
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<image href="GUID-37D2EFAE-FB55-5015-90CE-1361144C411E_d0e195991_href.png" placement="inline"/> |
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<p>Non-modifiable pointer descriptor</p> |
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</fig> </section> |
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<section id="GUID-33072A44-C95A-4688-AB85-019EFDC4F1B2"><title>Modifiable pointer descriptor</title> <p>The data represented |
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by a modifiable pointer descriptor can be both accessed and changed through |
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this descriptor. </p> <p>The length of the data can vary between zero and |
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the maximum length. The maximum length of the descriptor is set by the constructor. |
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When the length of the data is less than the maximum, a portion of the data |
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area represented by the descriptor is unused. </p> <p>Data is accessed and |
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modified through functions provided by the base classes. </p> <p>A modifiable |
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pointer descriptor is supplied in two variants: </p> <ul> |
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<li id="GUID-2DD694B8-8408-58F8-BE98-1D031666DEC5"><p>the 16 bit variant, |
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a <codeph>TPtr16</codeph>, for representing Unicode strings. </p> </li> |
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<li id="GUID-5D1EB254-6B9D-576C-9631-3461AC8FFD32"><p>the 8 bit variant, a <codeph>TPtr8</codeph>, |
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for representing non-Unicode strings and binary data. </p> </li> |
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</ul> <p>There is also a build independent type, <codeph>TPtr</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 for |
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binary data. The explicit 16 bit variant is rarely used. </p> <p>The base |
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class <codeph>TDesC</codeph>, contains a data member that holds the length |
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of the data. The base class <codeph>TDes</codeph>, contains a data member |
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that holds the maximum length of the data. The following drawing shows the |
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layout of a <codeph>TPtr</codeph> object for a string of five characters representing |
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the English word "Hello". The maximum length to be represented by the descriptor |
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is 12. </p> <fig id="GUID-B6213E7F-AE00-5854-BBB7-C82BE71CB495"> |
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<image href="GUID-8983A095-3F5A-5262-8920-8A13ADD045DC_d0e196056_href.png" placement="inline"/> |
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<p>Modifiable pointer descriptor</p> |
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</fig> </section> |
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</conbody></concept> |