Symbian3/SDK/Source/GUID-807B5CEE-CC1E-5A40-911F-3C5D5FA3633A.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 21 Jan 2010 18:18:20 +0000
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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-807B5CEE-CC1E-5A40-911F-3C5D5FA3633A" xml:lang="en"><title>How to
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use standard buffer operations</title><shortdesc>Explains the functions to read, write, insert, delete and compress
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data in buffers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>Dynamic buffers have the expected standard buffer operations.</p>
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<section id="GUID-7AC34BEB-0BAB-462D-A170-B42446625805"><title>InsertL() example</title> <p>You can insert data into a buffer
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using <codeph>InsertL()</codeph>. In the following example code fragment,
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data is inserted into the buffer initially, and then some more data inserted
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into the middle of the first data.</p> <codeblock id="GUID-0237C066-1F66-5D54-BA06-5FBFC8C0F1F4" xml:space="preserve"> // insert text into buffer
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 _LIT8(KTxtHello,"Hello!");
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 _LIT8(KWorld," world");
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 ...
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 aBuf-&gt;InsertL(0,KTxtHello);
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 writeBuf(aBuf); // gives “Hello!”
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 aBuf-&gt;InsertL(5,KWorld);
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 writeBuf(aBuf); // gives “Hello world!”</codeblock> <p>In common with all
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functions that expand the size of the buffer, <codeph>InsertL()</codeph> may
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fail, by leaving. When you program with dynamic buffers, you must ensure that
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all potential leaves are handled correctly.</p> <p><codeph>InsertL()</codeph>,
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and the entire dynamic buffer API, deals only with 8-bit byte data. When interfacing
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with descriptors which contain text, you should take special precautions to
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ensure that UNICODE is handled correctly.</p> </section>
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<section id="GUID-9C234566-872B-44E0-BBB4-8892FB58E1DD"><title>Read() example</title> <p>Data can be read from a buffer by
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specifying a start position and a target descriptor. The number of bytes to
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be read may be specified explicitly, as here, or by the descriptor length.
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Another <codeph>Read()</codeph> variant, specifying the target as a <codeph>TAny*</codeph>,
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is provided.</p> <p>The following code fragment follows from the previous
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one:</p> <codeblock id="GUID-33E8D519-72DB-5BFA-8904-BC63B3F13820" xml:space="preserve"> // read from buffer into descriptor
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 TBuf8&lt;10&gt; des;
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 aBuf-&gt;Read(3,des,5); // puts "lo wo" into des.</codeblock> </section>
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<section id="GUID-DB7447A4-FA97-4727-B92D-E61556EA4AF5"><title>Write() example</title> <p><codeph>Write()</codeph> overwrites
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existing data in the buffer. Because the buffer is not expanded, <codeph>Write()</codeph> cannot
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leave. You must ensure that the region you select in the buffer already exists:
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if <codeph>Write()</codeph> attempts to write beyond the end of the data already
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in the buffer, a panic occurs.</p> <codeblock id="GUID-F5A86813-3C56-58B1-AAB0-E888E61BF736" xml:space="preserve"> // [over]write some stuff in buffer
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 _LIT8(KFolks,"folks");
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 aBuf-&gt;Write(6,KFolks);
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 writeBuf(aBuf); // gives “Hello folks!”</codeblock> </section>
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<section id="GUID-53F96FF4-38D1-4F4B-93DD-AA6B85FF8C99"><title>Delete() example</title> <p><codeph>Delete()</codeph> deletes
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data in the buffer. It can never fail.</p> <codeblock id="GUID-AA268BA8-CF54-5D93-A869-0EB291F5CE5A" xml:space="preserve"> // delete stuff
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 aBuf-&gt;Delete(5,6);
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 writeBuf(aBuf); // gives “Hello!”</codeblock> </section>
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<section id="GUID-D06541B3-1FA0-4511-91AA-8F8F33CBD273"><title>Compress() example</title> <p><codeph>Compress()</codeph> ensures
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that the buffer data occupies the minimum space. In the case of flat buffers,
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this re-allocates the cell to the size of the data in the buffer. In the case
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of segmented buffers, it may shuffle data so as to occupy the minimum number
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of segments.</p> <codeblock id="GUID-4F22F39C-756E-5665-AE58-816237D771C6" xml:space="preserve">// compress
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 aBuf-&gt;Compress();
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 writeBuf(aBuf);</codeblock> </section>
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</conbody></concept>