<?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 xml:lang="en" id="GUID-88E610C1-6662-5A12-B950-B695A7EB776C"><title>How to cleanup streams</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The Store framework makes extensive use of the cleanup stack. </p> <p>Before read streams or write streams are disposed of, for example, when an <codeph>RStoreWriteStream</codeph> or <codeph>RStoreReadStream</codeph> object goes out of scope, resources acquired by the stream objects must be released.</p> <p>The easiest way to do this is to use the <codeph>CreateLC()</codeph>, <codeph>OpenLC()</codeph>, <codeph>AppendLC()</codeph> and <codeph>ReplaceLC()</codeph> variants that put a cleanup item onto the cleanup stack.</p> <p>Before disposing of the read or write stream object, but after any data is committed, call <codeph>CleanupStack::PopAndDestroy()</codeph>. For example:</p> <codeblock id="GUID-A2C41FDD-5A52-5A7B-8965-CCFFA458D244" xml:space="preserve">...

TStreamId id = outstream.CreateLC(*store);

...

outstream.CommitL();

...

CleanupStack::PopAndDestroy();

...</codeblock> <p>For write streams, data must be committed to the stream before releasing resources.</p> <p>Alternatively, if the <codeph>CreateL()</codeph>, <codeph>OpenL()</codeph>, <codeph>AppendL()</codeph> and <codeph>ReplaceL()</codeph> variants are used, then an explicit call to <codeph>PushL()</codeph> must be made to put a cleanup item onto the cleanup stack. For example:</p> <codeblock id="GUID-DF572C67-C2F8-52F5-A8DB-3A23DC6F1A50" xml:space="preserve">...

TStreamId id = outstream.CreateL(*store);

outstream.PushL();

...

outstream.CommitL();

...

CleanupStack::PopAndDestroy();