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-37057FD5-7ED0-5B18-9C28-39F6816D7627" xml:lang="en"><title>Arrays |
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13 within structs</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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14 <p>A declaration of a struct member may either be a simple <varname>type-name</varname> <varname>member-name</varname>, |
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15 or it may be an array of values of identical type.</p> |
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16 <p>Arrays are always indicated by square brackets:</p> |
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17 <codeblock id="GUID-4F6A2882-FDF8-5DBA-A01D-6772D5BDF70F" xml:space="preserve">STRUCT HAS_ARRAY |
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18 { |
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19 STRUCT elements[]; |
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20 }</codeblock> |
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21 <p>In the example above, the <codeph>HAS_ARRAY</codeph> struct has one array |
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22 member, <codeph>elements</codeph>. Each member of <codeph>elements</codeph> is |
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23 of <codeph>STRUCT</codeph> type.</p> |
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24 <p><b>Array size</b> </p> |
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25 <p>If you specify the array size, inside the square brackets, then the generated |
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26 resource will contain no count of the number of elements. So this resource:</p> |
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27 <codeblock id="GUID-F50D2117-7554-5D80-ABF1-2393E65B54CB" xml:space="preserve">STRUCT FIXED_ARRAY |
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28 { |
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29 WORD elements[3]; |
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30 } |
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31 |
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32 RESOURCE FIXED_ARRAY example1 |
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33 { |
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34 elements={9,8,7}; |
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35 }</codeblock> |
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36 <p>will generate the output</p> |
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37 <codeblock id="GUID-880DF2CB-D042-59CD-AF28-89D971CC6466" xml:space="preserve">0x09 0x00 0x08 0x00 0x07 0x00</codeblock> |
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38 <p>For variable length arrays, a count of the number of elements precedes |
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39 the resource. The default for this is a word, but by prefixing the struct |
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40 definition with <codeph>LEN BYTE</codeph> it will be a byte count. So the |
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41 following resource:</p> |
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42 <codeblock id="GUID-FEAD195C-8C3F-529F-AE2A-AC42F2ACA66F" xml:space="preserve">STRUCT VAR_ARRAY |
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43 { |
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44 WORD elements []; |
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45 } |
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46 |
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47 RESOURCE VAR_ARRAY example2 |
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48 { |
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49 elements={9,8,7}; |
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50 }</codeblock> |
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51 <p>will generate the output</p> |
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52 <codeblock id="GUID-D21EA8C8-876D-5DD8-9F0C-256288A2B6B1" xml:space="preserve">0x03 0x00 0x09 0x00 0x08 0x00 0x07 0x00 </codeblock> |
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53 <p>whereas this resource:</p> |
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54 <codeblock id="GUID-14A52C15-5D28-5716-AED4-22F02AF23AAE" xml:space="preserve">STRUCT VAR_ARRAY2 |
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55 { |
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56 LEN BYTE WORD elements[]; |
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57 } |
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58 |
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59 RESOURCE VAR_ARRAY2 example3 |
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60 { |
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61 elements={9,8,7}; |
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62 }</codeblock> |
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63 <p>will generate this output</p> |
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64 <codeblock id="GUID-3909C1FE-84B3-50D1-9519-417B84DD93B0" xml:space="preserve">0x03 0x09 0x00 0x08 0x00 0x07 0x00</codeblock> |
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65 <p>The compiler allows you to prefix <codeph>LEN BYTE</codeph> or <codeph>LEN |
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66 WORD</codeph> even for fixed length arrays, but it has no effect. Fixed length |
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67 arrays do not generate an element count.</p> |
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68 </conbody><related-links> |
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69 <link href="GUID-0142B290-DA6C-5574-83D7-7555D804D9B5.dita"><linktext>How to initialise |
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70 array RESOURCE members</linktext></link> |
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71 </related-links></concept> |
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