Symbian3/PDK/Source/GUID-F9471A5D-D239-5B24-A116-2B5B2C1F5C61.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Wed, 16 Jun 2010 10:24:13 +0100
changeset 10 d4524d6a4472
parent 5 f345bda72bc4
child 14 578be2adaf3e
permissions -rw-r--r--
removal of PIPS 'antiword' example pending a decision on its license
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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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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-->
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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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-F9471A5D-D239-5B24-A116-2B5B2C1F5C61"><title>Restoring Pictures Tutorial</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Pictures can be restored in two different ways. One way is to restore the picture header and restore the data immediately afterwards. The other way is to restore the picture header and defer the loading of the picture data until a later time. </p> <p>This second way is commonly used when loading rich text documents that include pictures. Using a deferred loading scheme, pictures that occur towards the end of a document need not be loaded until they are needed to be displayed, thus economizing on memory use. </p> <section><title>Restoring the picture header</title> <p>This fragment assumes that the picture header is stored in the root stream of the store, making it easy to restore: </p> <codeblock id="GUID-44712CF8-FBB7-5898-B1F9-C43BB82C17EC" xml:space="preserve">// The file used in the example
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_LIT(KFileName,"C:\\grpict.dat");
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f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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// Open the direct file store
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CDirectFileStore* store = CDirectFileStore::OpenLC(fsSession,KFileName,EFileRead);
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// Read the header stream
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RStoreReadStream stream;
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stream.OpenLC(*store,store-&gt;Root());
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TPictureHeader header;
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header.InternalizeL(stream);</codeblock> <codeblock id="GUID-8F9F9D3D-36E7-534A-BA05-5FF545487DDB" xml:space="preserve">// Close store
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CleanupStack::PopAndDestroy(2); // stream, store</codeblock> <ol id="GUID-A3461FFF-48C2-5447-AA8E-E23C3E9696B7"><li id="GUID-12F9B67D-4A85-5648-89BB-B3CA41DCFBC1"><p>Open the direct file store containing the picture. </p> </li> <li id="GUID-F43C5DEB-BFB9-5076-BCEC-61495B3F326A"><p>Open the root stream of the store, and InternalizeL the picture header. </p> </li> <li id="GUID-5E9FDE2A-4E64-5262-92E9-B15870C6D5AD"><p>Close the stream and store. </p> </li> </ol> </section> <section><title>Restoring the picture data: an example of a MPictureFactory-derived class</title> <p>To restore the picture data itself, it must have an associated entry in a picture factory. The picture factory ensures that the picture data in the store is restored to the correct picture type, which is specified by a UID in the picture header. A picture factory can allow a number of different types of picture to be restored, calling the correct constructor for the class indicated by the UID. In the following example code the picture factory allows only pictures of type <codeph>CSmileyPicture</codeph> to be restored, and panics if the picture data in the store is of another type. </p> <p><b>Restoring the picture </b> </p> <codeblock id="GUID-F05D870C-C1D6-5D04-81AE-703F50054191" xml:space="preserve">// The file used in the example
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_LIT(KFileName,"C:\\grpict.dat");
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f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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// Open the direct file store
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CDirectFileStore* store = CDirectFileStore::OpenLC(fsSession,KFileName,EFileRead);
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// Read the picture
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TExamplePictureFactory factory;
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TPictureHeader header;
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factory.NewPictureL(header,*store);
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iPicture = (CSmileyPicture *) header.iPicture.AsPtr();
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// Close store
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CleanupStack::PopAndDestroy();</codeblock> <p><b>Picture factory </b> </p> <codeblock id="GUID-578BC9C7-9D62-5ADF-A2B5-6601588FE384" xml:space="preserve">class TExamplePictureFactory: public MPictureFactory
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    {
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public:
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    void NewPictureL(TPictureHeader&amp; aHeader,
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            const CStreamStore&amp; aDeferredPictureStore) const;
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    };
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</codeblock> <codeblock id="GUID-C5CCB0B1-3D13-581E-8990-15084212BFB3" xml:space="preserve">void TExamplePictureFactory::NewPictureL(TPictureHeader&amp; aHeader,
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            const CStreamStore&amp; aDeferredPictureStore) const
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    {
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    if (aHeader.iPictureType == KUidExampleSmileyPicture)
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        {
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            // Restore new picture from store into 
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            // the TSwizzle, which changes from
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            // stream id to pointer.
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            // Construct CSmileyPicture object and 
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            // restore from stream.
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        if (aHeader.iPicture.IsId())
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            aHeader.iPicture = CSmileyPicture::NewL(aDeferredPictureStore,aHeader.iPicture.AsId());
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        }
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    else
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        {
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            // Leave
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        User::Leave(KErrNoMemory);
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        }
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25a17d01db0c Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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    }</codeblock> </section> </conbody><related-links><link href="GUID-520AC2F0-009E-51F3-A661-3B6E949F1423.dita"><linktext>Picture Tutorials</linktext> </link> <link href="GUID-5CEE36FC-C5A9-5C4E-9DBC-9C7B5B44EA2F.dita"><linktext>Picture Concepts</linktext> </link> </related-links></concept>