--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita	Wed Mar 31 11:11:55 2010 +0100
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832" xml:lang="en"><title>rbufexample:
+Using resizable buffer descriptors</title><shortdesc>This example application demonstrates how to use the <codeph>RBuf</codeph> class. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita"><apiname>RBuf</apiname></xref> is a resizable buffer descriptor. It is part of
+the user library. It is used to contain strings and binary data when the maximum
+size of the data is not known until run time. </p>
+<p>This overview contains the following sections: </p>
+<ul>
+<li id="GUID-6A429EA8-8396-5A67-BF08-5CC81426D99A"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-7605348A-0F8B-56A4-A48C-C83CB1CD546D">Download</xref> </p> </li>
+<li id="GUID-9BBBEFB0-D463-5A81-9AF8-8FE0FB781D5A"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-BC0B8F0D-94A8-51D1-9BC2-85E4F76C482A">Description</xref>  </p> </li>
+<li id="GUID-4946F730-6E6A-5EC2-8A73-F0E29EBB09D9"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-69043124-f5fc-499b-8550-0c5b6ed66fe5">Class summary</xref>  </p> </li>
+<li id="GUID-4D0A67AF-FAC5-51F5-8C4F-5E9FBF1C2981"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-111B7B66-A3C4-5A15-8CF2-C6A227483651">Build</xref>  </p> </li>
+<li id="GUID-F01C5F43-391A-562A-A6E2-B7C34A2FB01A"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-E30CC1D4-B854-5080-8F37-950CA4D86DD0">See also</xref>  </p> </li>
+</ul>
+<section id="GUID-7605348A-0F8B-56A4-A48C-C83CB1CD546D"><title>Download</title> <p>Click
+on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-7520d937-647a-495a-9196-edca52b98e89.zip" scope="external">rbufexample.zip</xref>.</p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-7520d937-647a-495a-9196-edca52b98e89.html" scope="peer">browse</xref> to view the example code.</p> </section>
+<section id="GUID-BC0B8F0D-94A8-51D1-9BC2-85E4F76C482A"><title>Description</title> <ul>
+<li id="GUID-87468748-0221-5005-9A98-EE03F5280421"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-B2AF4A97-A93B-5437-A31D-85C98AFC7DBB"> Creating an RBuf</xref>  </p> </li>
+<li id="GUID-6A66563D-F504-5D7E-8274-78126F2877F8"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-88B88124-BB7D-58DC-9F8A-61C32BDD58C4">Swapping two RBufs</xref>  </p> </li>
+<li id="GUID-6F41B457-6A2B-5895-8404-DCE5F971B59B"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-893B2BF3-AD9F-587D-95D5-165014C932B4">Copying data to an RBuf using the assignment operator</xref>  </p> </li>
+<li id="GUID-0B584C6E-A740-5CD6-A8F7-E2DA4327D2B9"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-2B6B8519-6306-5F0C-8A79-4094A3037901">Reallocating an RBuf</xref>  </p> </li>
+<li id="GUID-D96AC20C-5F22-52F7-B299-F178B90AE214"><p> <xref href="GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832.dita#GUID-C85EECD6-2CFD-5BA9-A60B-F7AF3A74E832/GUID-DE5A5DC0-07C6-50B9-AFDA-E69A92A02980"> Replacing and modifying the data in an RBuf</xref>  </p> </li>
+</ul> <p id="GUID-B2AF4A97-A93B-5437-A31D-85C98AFC7DBB"><b>Creating an RBuf</b> </p> <p>The
+example demonstrates creating an <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita"><apiname>RBuf</apiname></xref> in the following
+ways: </p> <ol id="GUID-B4E38F9F-B275-5364-B59C-71087CDDAF1C">
+<li id="GUID-0482EE2B-165C-5B55-B819-741026C38F02"><p> <b>Using RBuf::Create()
+or RBuf::CreateL():</b> These functions create either an empty descriptor,
+or one with data copied from another descriptor. </p> </li>
+<li id="GUID-00E1680C-CB9C-5CC8-BC4A-C7337E0B9B9D"><p> <b>Using RBuf::CreateMax()
+or RBuf::CreateMaxL():</b> These functions set the buffer's current length
+to be the same as its maximum length. </p> </li>
+<li id="GUID-A0E4C908-5542-53D3-8452-BDA3BFB8887D"><p> <b>By assigning from
+an HBufC:</b> <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-74F343A0-4ABB-378E-99D0-CAA13581AA4E"><apiname>RBuf::Assign()</apiname></xref> transfers ownership of the
+heap descriptor. It is not possible to access the original heap descriptor
+once ownership has been transferred. </p> </li>
+<li id="GUID-B8812B95-CE27-5850-B866-F6DBC18ADF8C"><p> <b>By assigning some
+previously allocated memory:</b> <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-74F343A0-4ABB-378E-99D0-CAA13581AA4E"><apiname>RBuf::Assign()</apiname></xref> transfers
+ownership of allocated memory. It is then not possible to access the original
+memory. </p> </li>
+<li id="GUID-9FCBF30F-815B-5CA9-B0B6-1698DA0C4F0E"><p> <b>Using RReadStream:</b> The
+example writes some text to a file stream (<codeph>RFileWriteStream</codeph>).
+Then it creates the buffer by passing the open stream object to <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-7CACD30A-D6FC-38CB-A754-CB4B5C3728FF"><apiname>RBuf::CreateL()</apiname></xref>. </p> </li>
+</ol><p><b>Related APIs</b></p><ul>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita"><apiname>RBuf</apiname></xref> - Defines a build-independent resizable buffer
+descriptor.</p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-74F343A0-4ABB-378E-99D0-CAA13581AA4E"><apiname>RBuf::Assign()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-938BB912-4B66-3FF0-B830-CC4F778B23A9"><apiname>RBuf::Create()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-7CACD30A-D6FC-38CB-A754-CB4B5C3728FF"><apiname>RBuf::CreateL()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-7F4E287B-F06C-33CF-9F17-E0E69244860A"><apiname>RBuf::CreateMax()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-792C0C3B-203E-37FF-9BCF-8C9AEDB1CECE"><apiname>RBuf::CreateMaxL()</apiname></xref></p></li>
+</ul> <p id="GUID-88B88124-BB7D-58DC-9F8A-61C32BDD58C4"><b>Swapping two RBufs</b> </p> <p>The
+example creates two resizable buffers using <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-938BB912-4B66-3FF0-B830-CC4F778B23A9"><apiname>RBuf::Create()</apiname></xref>.
+Then it swaps the contents of them using <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-D3EA0EA9-EC2C-3555-8D39-7AF1EF6C7E8B"><apiname>RBuf::Swap()</apiname></xref>. </p> <p> <b>Note:</b> When
+you swap data between two <codeph>RBuf</codeph> s ensure that the maximum
+length of the target <codeph>RBuf</codeph> is sufficient to hold the data,
+otherwise a panic (<codeph>User 11</codeph>) occurs. </p><p><b>Related APIs</b></p><ul>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-938BB912-4B66-3FF0-B830-CC4F778B23A9"><apiname>RBuf::Create()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-D3EA0EA9-EC2C-3555-8D39-7AF1EF6C7E8B"><apiname>RBuf::Swap()</apiname></xref></p></li>
+</ul> <p id="GUID-893B2BF3-AD9F-587D-95D5-165014C932B4"><b>Copying data to
+an RBuf using the assignment operator</b> </p> <p>The example creates two
+resizable buffers and allocates memory using <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-938BB912-4B66-3FF0-B830-CC4F778B23A9"><apiname>RBuf::Create()</apiname></xref>.
+It then copies data to these buffers. It also copies data from the first buffer
+to the second buffer using the assignment operator. </p> <p> <b> Notes:</b>  </p> <ul>
+<li id="GUID-9B2835F9-BD3E-56DD-9CFD-F71677FFC71C"><p>When you use <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-74F343A0-4ABB-378E-99D0-CAA13581AA4E"><apiname>RBuf::Assign()</apiname></xref>,
+ownership of the buffer is transferred. <codeph>Assign()</codeph> neither
+checks nor frees any pre-existing owned allocated memory. If this descriptor
+already owns some allocated memory, <xref href="GUID-BEFF9C91-DA64-3032-96E8-F5054405DC74.dita#GUID-BEFF9C91-DA64-3032-96E8-F5054405DC74/GUID-32EB41B6-A1C8-326C-9D52-095B05D4D20B"><apiname>RBuf16::Close()</apiname></xref> should
+be invoked on it before calling <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-74F343A0-4ABB-378E-99D0-CAA13581AA4E"><apiname>RBuf::Assign()</apiname></xref>, otherwise
+a memory leak will occur. </p> </li>
+<li id="GUID-41218102-1810-5E83-BAEE-5683D378F75F"><p>When you use the assignment
+operator, you must make sure the target descriptor's maximum length is equal
+to or greater than the length of the source descriptor, otherwise a <codeph>User
+11</codeph> panic (descriptor overflow) occurs. Any existing data in the target
+descriptor is replaced. </p> </li>
+</ul> <p><b>Related APIs</b></p><ul>
+<li><p><xref href="GUID-BEFF9C91-DA64-3032-96E8-F5054405DC74.dita#GUID-BEFF9C91-DA64-3032-96E8-F5054405DC74/GUID-32EB41B6-A1C8-326C-9D52-095B05D4D20B"><apiname>RBuf16::Close()</apiname></xref></p></li>
+<li><p> <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-74F343A0-4ABB-378E-99D0-CAA13581AA4E"><apiname>RBuf::Assign()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-938BB912-4B66-3FF0-B830-CC4F778B23A9"><apiname>RBuf::Create()</apiname></xref></p></li>
+</ul><p id="GUID-2B6B8519-6306-5F0C-8A79-4094A3037901"><b>Reallocating an
+RBuf</b> </p> <p>The example creates a resizable buffer descriptor, then it
+resizes it using <codeph>RBuf::ReAlloc()</codeph>. The old and new lengths
+are printed to the console to show how <codeph>ReAlloc()</codeph> does not
+change the length of the descriptor, but only its maximum length. Calling <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-D07FA48B-6FD0-3683-AEC9-ABC672AB2D80"><apiname>RBuf::ReAlloc()</apiname></xref> with
+a value of zero frees the memory and sets the length and maximum length to
+zero. </p><p><b>Related APIs</b></p><ul>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-D07FA48B-6FD0-3683-AEC9-ABC672AB2D80"><apiname>RBuf::ReAlloc()</apiname></xref></p></li>
+</ul> <p id="GUID-DE5A5DC0-07C6-50B9-AFDA-E69A92A02980"><b> Replacing and
+modifying the data in an RBuf</b> </p> <p>The example creates a resizable
+buffer descriptor and replaces a portion of the data in it using <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-0958525F-DB10-3D9A-AE99-B8113CA15810"><apiname>RBuf::Replace()</apiname></xref>.
+The start position and length of the data to be replaced, and the replacement
+text are passed as parameters. <xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-019690E0-EFD2-3A9D-9332-11FB5A16D407"><apiname>RBuf::Delete()</apiname></xref> is then used
+to delete the replacement text, by specifying the position and length of the
+data to be deleted. </p><p><b>Related APIs</b></p><ul>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-019690E0-EFD2-3A9D-9332-11FB5A16D407"><apiname>RBuf::Delete()</apiname></xref></p></li>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita#GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8/GUID-0958525F-DB10-3D9A-AE99-B8113CA15810"><apiname>RBuf::Replace()</apiname></xref></p></li>
+</ul> </section>
+<section id="GUID-69043124-F5FC-499B-8550-0C5B6ED66FE5"><title>Class summary</title><ul>
+<li><p><xref href="GUID-BFBC574B-EFF6-37A4-9189-B71DA1505BC8.dita"><apiname>RBuf</apiname></xref> - Defines a build-independent resizable buffer
+descriptor.</p></li>
+<li><p> <xref href="GUID-A103FB19-60B3-3E45-97A5-1F295934ACA1.dita"><apiname>HBufC</apiname></xref> - Defines a build-independent heap descriptor.</p></li>
+<li><p><xref href="GUID-EFFA9A71-4CA4-3227-879D-17EFEB8B07D6.dita"><apiname>RFileWriteStream</apiname></xref> - Supports the writing of a stream
+to a file.</p></li>
+<li><p><xref href="GUID-90A3AE1D-DCB2-3E98-8BE9-C48C15964E7D.dita"><apiname>RFileReadStream</apiname></xref> - Supports the reading of a stream
+from a file.</p></li>
+<li><p><xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs</apiname></xref></p></li>
+</ul></section>
+<section id="GUID-111B7B66-A3C4-5A15-8CF2-C6A227483651"><title>Build</title> <p>The <xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">Symbian build process</xref> describes
+how to build this example application. The example builds an executable file
+called <filepath>rbufexample.exe</filepath> in the standard location (<filepath>\epoc32\release\winscw\&lt;build_variant&gt;</filepath> for
+the emulator). After launching the executable, depending on the emulator you
+are using, you may need to navigate away from the application launcher/shell
+screen to view the console. </p> </section>
+<section id="GUID-E30CC1D4-B854-5080-8F37-950CA4D86DD0"><title>See also</title> <p> <xref href="GUID-4AC3CC42-6E8D-584A-AA39-84B5E0F3C16A.dita">How to use the resizable
+buffer descriptor - RBuf</xref>  </p> </section>
+</conbody></concept>
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