Symbian3/PDK/Source/GUID-8A2029C7-1258-5B12-B217-DE3EE4340B72.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
parent 14 578be2adaf3e
permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
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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 xml:lang="en" id="GUID-8A2029C7-1258-5B12-B217-DE3EE4340B72"><title>How to externalise and internalise</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>For a class TX defined as:</p> <codeblock id="GUID-8F730CDE-638B-5D07-B5A8-864DEE4BCB7E" xml:space="preserve">class TX
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      {
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public:
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      ...
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      void ExternalizeL(RWriteStream&amp; aStream) const;
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      void InternalizeL(RReadStream&amp; aStream);
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      ...
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      };</codeblock> <p>an instance of <codeph>TX</codeph> can be externalised to the stream <codeph>outstream</codeph>, by calling the <codeph>ExternalizeL()</codeph> member function of <codeph>TX</codeph>:</p> <codeblock id="GUID-81A69F24-8A0E-5473-89A4-899DD96DDD65" xml:space="preserve">    ...
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    TX object;
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    ...
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    object.ExternalizeL(outstream);
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    ...</codeblock> <p>An alternative, and better way, is to use the templated stream <codeph>operator&lt;&lt;</codeph>. The Store framework implements this by calling <codeph>TX::ExternalizeL()</codeph>. The syntax is simply:</p> <codeblock id="GUID-8ABF4FD0-9F1E-5AB9-8D88-6A9EC3700C19" xml:space="preserve">    ...
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    outstream &lt;&lt; object; // externalise object
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    ...</codeblock> <p>Similarly, the <codeph>TX</codeph> object can be internalised from the stream <codeph>instream</codeph>, by calling the <codeph>InternalizeL()</codeph> member function of <codeph>TX</codeph>:</p> <codeblock id="GUID-6F2EE0E7-A9F2-5F87-AD16-AA6821C36313" xml:space="preserve">    TX object;
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       ...
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    object.InternalizeL(instream);
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    ...</codeblock> <p>The templated stream <codeph>operator&gt;&gt;</codeph> can also be used. The Store framework implements this by calling <codeph>TX::InternalizeL()</codeph>. The syntax is simply:</p> <codeblock id="GUID-A4B294A0-0311-5D38-805D-76CD6939D85E" xml:space="preserve">instream &gt;&gt; object; // internalise object</codeblock> </conbody></concept>