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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-FD273259-2282-5353-847D-853D483C37BC" xml:lang="en"><title>Using |
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13 TDesC8 Class</title><shortdesc>Use TDescC8 for interfaces which takes binary data or explicit |
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14 narrow text, regardless of the build variant, but which does not need to change |
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15 the data. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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16 <section id="GUID-F1F7E9F9-0B79-5F45-9C67-587A74BBE209"><title>Using in a |
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17 function interface</title> <p>Interfaces which take binary data or narrow |
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18 text, use descriptors in the specification of that interface. All 8 bit concrete |
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19 descriptors are derived from <codeph>TDesC8</codeph> which means that the |
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20 interface can accept any 8 bit descriptor.</p> <p>The following code fragment |
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21 shows the most common function prototype pattern.</p> <codeblock id="GUID-2679659B-7A39-5C43-8B18-878BDE54AD3E" xml:space="preserve">void ClassX::foo(const TDesC8& anArg);</codeblock> <p>The use of <codeph>TDesC8</codeph> ensures that the data cannot be modified |
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22 through the descriptor; <codeph>const</codeph> is an extra guarantee that |
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23 the data cannot be changed.</p> <p>In practice, nearly all code uses the build |
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24 independent variant, <codeph>TDesC</codeph>, unless an explicit 8 bit or 16 |
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25 bit build variant is required.</p> </section> |
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26 <section id="GUID-2342D6CC-9781-5353-A2D4-EBA6FAC6E0E2"><title>Extract leftmost |
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27 part of data</title> <p>The code fragment shows how the leftmost part of data |
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28 in a descriptor can be accessed, using the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-0593A69B-B19A-3D2C-861A-216892E60180"><apiname>TDesC8::Left()</apiname></xref> member |
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29 function.</p> <p>The behaviour is the same for the build independent variant, <xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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30 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with <xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref> and <xref href="GUID-6DF731E4-5691-31C4-BEE0-03A3873F15EC.dita"><apiname>TPtrC8</apiname></xref> with <xref href="GUID-5CD07A27-E3ED-3273-A560-680501468C91.dita"><apiname>TPtrC</apiname></xref>.</p> <codeblock id="GUID-2707349F-04BD-59BC-8639-4794F506AFD0" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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31 TBufC8<8> str(KData); |
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32 ... |
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33 str.Left(4);</codeblock> <p>The call to <codeph>Left()</codeph> returns a |
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34 non-modifiable pointer descriptor representing the data string "<codeph>abcd</codeph>"; |
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35 this has length 4. The original data contained in, and represented by, the |
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36 non-modifiable buffer descriptor <codeph>str</codeph>, is not changed in any |
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37 way.</p> <codeblock id="GUID-13D0C4D6-1534-56AF-B32E-4DB886555C69" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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38 TBufC8<8> str(KData); |
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39 ... |
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40 str.Left(256);</codeblock> <p>This call to <codeph>Left()</codeph> returns |
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41 a non-modifiable pointer descriptor representing the data string "<codeph>abcdefg</codeph>", |
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42 i.e. the whole content of the descriptor <codeph>str</codeph>; this has length |
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43 7.</p> <p>Note that the following call to <codeph>Left()</codeph> results |
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44 in a panic.</p> <codeblock id="GUID-1C8BAE4F-E649-5950-BD1C-2C7ED471B443" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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45 TBufC8<8> str(KData); |
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46 ... |
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47 str.Left(-1); // Panic !</codeblock> </section> |
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48 <section id="GUID-1842A134-AFBF-5282-8052-424C7BF66963"><title>Extract rightmost |
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49 part of data</title> <p>The code fragment shows how the rightmost part of |
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50 data in a descriptor can be accessed, using the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-4113AD10-171C-38C0-B3B5-93FF0BFCBBC5"><apiname>TDesC8::Right()</apiname></xref> member |
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51 function.</p> <p>The behaviour is the same for the build independent variant, <xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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52 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with <xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref> and <xref href="GUID-6DF731E4-5691-31C4-BEE0-03A3873F15EC.dita"><apiname>TPtrC8</apiname></xref> with <xref href="GUID-5CD07A27-E3ED-3273-A560-680501468C91.dita"><apiname>TPtrC</apiname></xref>.</p> <codeblock id="GUID-146EBCF8-AE0A-52BD-AC1D-25A61B223AE6" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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53 TBufC8<8> str(KData); |
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54 ... |
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55 str.Right(4);</codeblock> <p>The call to <codeph>Right()</codeph> returns |
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56 a non-modifiable pointer descriptor representing the data string "<codeph>defg</codeph>"; |
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57 this has length 4. The original data contained in, and represented by, the |
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58 non-modifiable buffer descriptor <codeph>str</codeph>, is not changed in any |
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59 way.</p> <codeblock id="GUID-79443C9B-FBE6-5B2F-B1BB-9610D6CB90A5" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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60 TBufC8<8> str(KData); |
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61 ... |
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62 str.Right(256);</codeblock> <p>This call to <codeph>Right()</codeph> returns |
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63 a non-modifiable pointer descriptor representing the data string "<codeph>abcdefg</codeph>", |
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64 i.e. the whole content of the descriptor <codeph>str</codeph>; this has length |
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65 7.</p> <p>Note that the following call to <codeph>Right()</codeph> results |
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66 in a panic.</p> <codeblock id="GUID-D9BF00DD-87BB-5125-B8F0-35B28D6E6E14" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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67 TBufC8<8> str(KData); |
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68 ... |
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69 str.Right(-1); // Panic !</codeblock> </section> |
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70 <section id="GUID-C72FC6C5-5D89-5797-B1E1-F8BD913F1CC7"><title>Extract middle |
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71 portion of the data</title> <p>The code fragment shows how a portion of data |
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72 within a descriptor can be accessed, using the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-E02A80AB-4479-376A-82FC-099BA20F6A01"><apiname>TDesC8::Mid()</apiname></xref> member |
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73 function. Each call to<codeph>Mid()</codeph> returns a non-modifiable pointer |
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74 descriptor representing the selected portions of data.</p> <p>The behaviour |
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75 is the same for the build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref> and <xref href="GUID-6DF731E4-5691-31C4-BEE0-03A3873F15EC.dita"><apiname>TPtrC8</apiname></xref> with<xref href="GUID-5CD07A27-E3ED-3273-A560-680501468C91.dita"><apiname>TPtrC</apiname></xref>.</p> <codeblock id="GUID-80455C29-5126-5C80-8DCC-8135AC7A23E2" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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76 TBufC8 str(KData); |
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77 ... |
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78 str.Mid(0); //returns TPtrC8 representing "abcdefg"; length is 7 |
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79 str.Mid(1); //returns TPtrC8 representing "bcdefg"; length is 6 |
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80 str.Mid(6); //returns TPtrC8 representing "g"; length is 1 |
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81 str.Mid(3,3); //returns TPtrC8 representing "def"; length is 3 |
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82 str.Mid(0,7); //returns TPtrC8 representing "abcdefg"; length is 7 |
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83 ... |
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84 str.Mid(8); // Panics ! |
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85 str.Mid(3,5); // Panics !</codeblock> </section> |
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86 <section id="GUID-884F8704-067A-5DF2-9FCE-7AC6FC8A2CD2"><title>Comparing data</title> <p>This |
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87 code fragment shows the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-1C79CC6C-9C60-3C91-84C0-84363B5A7B70"><apiname>TDesC8::Compare()</apiname></xref> function.</p> <p>The |
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88 behaviour is the same for the build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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89 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref>.</p> <codeblock id="GUID-E09FF7E7-8954-516E-AC1F-00F1B0675D19" xml:space="preserve">_LIT8(Kabcd, "abcd"); |
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90 _LIT8(Kabcde, "abcde"); |
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91 _LIT8(Kabc, "abc"); |
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92 _LIT8(Kabcx, "abcx"); |
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93 ... |
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94 TBufC8<8> str(Kabcd); |
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95 ... |
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96 str.Compare(Kabcde); // returns -ve |
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97 str.Compare(Kabc); // returns +ve |
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98 str.Compare(Kabcd); // returns zero |
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99 str.Compare(Kabcx); // returns -ve</codeblock> <p>This result of the comparison |
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100 means that:</p> <ul> |
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101 <li id="GUID-CE717629-1A33-5C6F-BBC0-F69B86297D8F"><p>"abcd" is less than |
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102 "abcde".</p> </li> |
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103 <li id="GUID-22640DC7-3446-5310-AC92-9E04ACE2B8BF"><p>"abcd" is greater than |
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104 "abc".</p> </li> |
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105 <li id="GUID-4A5A34DB-9B24-5F9B-A4CF-B07D5D93DDF0"><p>"abcd" is equal to "abcd".</p> </li> |
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106 <li id="GUID-71EF4AC1-8C0B-5A4A-8484-DBD6D0551A6C"><p>"abcd" is less than |
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107 "abcx".</p> </li> |
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108 </ul> </section> |
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109 <section id="GUID-F8DC34F6-C155-5085-9E76-2135603A802B"><title>Locating a |
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110 character</title> <p>This code fragment shows the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-2D247FCC-C975-39C4-947F-A1E89C273033"><apiname>TDesC8::Locate()</apiname></xref> function.</p> <p>The |
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111 behaviour is the same for the build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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112 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref>.</p> <codeblock id="GUID-A03FF85A-2A87-5DE3-81B9-BF1FB050CF1F" xml:space="preserve">_LIT8(Kabcd,"abcd"); |
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113 TBufC8<8> str(Kabcd); |
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114 ... |
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115 str.Locate('d'); // returns 3 |
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116 str.Locate('a'); // returns 0 |
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117 str.Locate('b'); // returns 1 |
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118 str.Locate('x'); // returns KErrNotFound</codeblock> </section> |
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119 <section id="GUID-F7BEE7D3-AF21-5774-BFC1-97C8CFFE08ED"><title>Finding data</title> <p>This |
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120 code fragment shows the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-1D939364-6C89-3CAA-BC0D-2F20BFBCF725"><apiname>TDesC8::Find()</apiname></xref> function.</p> <p>The |
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121 behaviour is the same for the build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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122 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref>.</p> <codeblock id="GUID-94D64D41-0247-57AD-85D7-08B91686602A" xml:space="preserve">_LIT8(KAtoZ,"abcdefghijklmnopqrstuvwxyz"); |
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123 TBufC8<32> str(KAtoZ); |
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124 ... |
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125 _LIT8(KFind1,"abc"); |
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126 str.Find(KFind1); // returns 0 |
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127 |
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128 _LIT8(KFInd2,"bcde"); |
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129 str.Find(KFInd2); // returns 1 |
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130 |
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131 _LIT8(KFind3,"uvwxyz"); |
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132 str.Find(KFind3); // returns 20 |
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133 |
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134 _LIT8(KFind4,"0123"); |
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135 str.Find(KFind4); // returns KErrNotFound |
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136 |
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137 _LIT8(KFind5,"abcdefghijklmnopqrstuvwxyz01"); |
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138 str.Find(KFind5); // returns KErrNotFound |
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139 |
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140 str.Find(KNullDesC8); // returns 0</codeblock> </section> |
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141 <section id="GUID-D192C3B7-1418-55BE-B70D-143D3FDD82DB"><title>Pattern matching</title> <p>This |
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142 code fragment shows the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-9BCB8339-2937-362D-85FF-3E5AE3A2CAFD"><apiname>TDesC8::Match()</apiname></xref> function.</p> <p>The |
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143 behaviour is the same for the build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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144 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref>.</p> <codeblock id="GUID-9B7216C7-F4BD-551F-895B-A8D6D9F8CC28" xml:space="preserve">_LIT8(KAtoZ,"abcdefghijklmnopqrstuvwxyz"); |
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145 TBufC8<32> str(KAtoZ); |
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146 ... |
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147 _LIT8(KMatch1,"*ijk*"); |
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148 str.Match(KMatch1); //returns -> 8 |
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149 |
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150 _LIT8(KMatch2,"*i?k*"); |
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151 str.Match(KMatch2); // -> 8 |
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152 |
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153 _LIT8(KMatch3,"ijk*"); |
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154 str.Match(KMatch3); // -> KErrNotFound |
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155 |
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156 _LIT8(KMatch4,"abcd"); |
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157 str.Match(KMatch4); // -> KErrNotFound |
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158 |
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159 _LIT8(KMatch5,"*i*mn*"); |
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160 str.Match(KMatch5); // -> 8 |
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161 |
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162 _LIT8(KMatch6,"abcdef*"); |
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163 str.Match(KMatch6); // -> 0 |
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164 |
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165 _LIT8(KMatch7,"*"); |
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166 str.Match(KMatch7); // -> 0 |
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167 |
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168 _LIT8(KMatch8,"*y*"); |
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169 str.Match(KMatch8); // -> 24 |
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170 |
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171 _lit8(KMatch9,"*i??k*"); |
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172 str.Match(KMatch9); // -> KErrNotFound</codeblock> <p>To test |
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173 for the existence of a pattern within a text string, the pattern must start |
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174 and end with an '<codeph>*</codeph>'.</p> </section> |
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175 <section id="GUID-B53507BB-D45B-5440-A025-B9690E15FACD"><title>Referencing |
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176 a data item</title> <p>The code fragment shows how a data item can be referenced |
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177 using<codeph>operator[]()</codeph>.</p> <p>The behaviour is the same for the |
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178 build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref>.</p> <codeblock id="GUID-8C4F4C8F-303F-5690-949B-851EF3BB52DE" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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179 TBufC8<8> str(KData); |
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180 ... |
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181 str[0]; // returns reference to 'a' |
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182 str[3]; // returns reference to 'd' |
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183 str[7]; // Panics !!</codeblock> </section> |
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184 <section id="GUID-83CFA0F7-A209-5E69-BE6B-4D5B17626202"><title>Creating a |
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185 heap descriptor</title> <p>The code fragments show how a heap descriptor is |
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186 created from an existing descriptor using the <xref href="GUID-FB97E0A3-352A-316F-97C6-69E4741A8120.dita#GUID-FB97E0A3-352A-316F-97C6-69E4741A8120/GUID-E6A17C44-EADD-3224-A16A-96263F16D004"><apiname>TDesC8::AllocL()</apiname></xref> member |
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187 function.</p> <p>The behaviour is the same for the build independent variant,<xref href="GUID-52D07F46-2162-380C-A775-C3BB335C42F5.dita"><apiname>TDesC</apiname></xref>, |
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188 replacing <xref href="GUID-964AAE0D-DA22-399E-8EFB-5DB1B58DA0A4.dita"><apiname>_LIT8</apiname></xref> with <xref href="GUID-B47B3E37-4FAC-327C-B626-49E09DB147FC.dita"><apiname>_LIT</apiname></xref>, <xref href="GUID-5B1CA2E7-E3A7-3AF8-9EB0-662E130C45DA.dita"><apiname>TBufC8</apiname></xref> with<xref href="GUID-4D64E4B7-6BEE-3900-A115-460FE5B2D79E.dita"><apiname>TBufC</apiname></xref>, |
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189 and<xref href="GUID-2A528453-0279-3E47-838C-F8A8D29B88F1.dita"><apiname>HBufC8</apiname></xref> with<xref href="GUID-A103FB19-60B3-3E45-97A5-1F295934ACA1.dita"><apiname>HBufC</apiname></xref>.</p> <codeblock id="GUID-6AF24F59-9224-59F0-84A2-9766EAFBCF79" xml:space="preserve">_LIT8(KData,"abcdefg"); |
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190 TBufC8<16> str(KData); |
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191 ... |
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192 HBufC8* ptr; |
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193 ... |
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194 ptr = str.AllocL(); //Creates and returns address of |
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195 ... //heap descriptor. The new heap descriptor |
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196 ... //contains a copy of the original data. |
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197 ptr->Length(); //Returns 7; the length of "abcdfeg"</codeblock> </section> |
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198 </conbody><related-links> |
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199 <link href="GUID-7830BAAB-40DD-5E55-84B5-8DCA888E68E7.dita#GUID-7830BAAB-40DD-5E55-84B5-8DCA888E68E7/GUID-235E272D-6F5A-5740-8150-9698C8C8D55D"> |
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200 <linktext>Using TDesC in a function interface</linktext> |
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201 </link> |
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202 </related-links></concept> |