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1 <?xml version="1.0" encoding="utf-8"?> |
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2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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3 <!-- This component and the accompanying materials are made available under the terms of the License |
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4 "Eclipse Public License v1.0" which accompanies this distribution, |
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5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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6 <!-- Initial Contributors: |
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7 Nokia Corporation - initial contribution. |
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8 Contributors: |
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9 --> |
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10 <!DOCTYPE concept |
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11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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12 <concept id="GUID-05785721-C090-50C6-BE5E-46EF14222FFF" xml:lang="en"><title>8 |
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13 bit variant, 16 bit variant and build independence</title><shortdesc>Describes 8 bit variant, 16 bit variant and build independence.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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14 <p>Descriptors are supplied in two variants:</p> |
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15 <ul> |
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16 <li id="GUID-6CAEBC92-A518-5623-8DE4-A685091CBD5B"><p>the 16 bit variant for |
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17 handling Unicode strings and double byte valued data</p> </li> |
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18 <li id="GUID-9D9C6C04-FFC2-5E41-8E55-E62DCC04CB31"><p>the 8 bit variant for |
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19 handling non-Unicode strings and single byte valued data (binary data).</p> </li> |
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20 </ul> |
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21 <p>Descriptors are also supplied as build independent types. These are used |
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22 whenever descriptors are used to represent text strings. By using build independent |
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23 types, the appropriate variant, either 16 bit or 8 bit, is selected at build |
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24 time depending on whether the <codeph>_UNICODE</codeph> macro has been defined |
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25 or not.</p> |
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26 <p>Binary data always requires the 8 bit variant, regardless of the build, |
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27 and this should be explicitly used in program code.</p> |
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28 <p>Explicit use of the 16 bit variant is rare.</p> |
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29 <p>With a few exceptions, the behaviour of both 8 bit and 16 bit variants |
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30 is the same.</p> |
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31 </conbody></concept> |