author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 3 | 46218c8b8afa |
permissions | -rw-r--r-- |
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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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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-BD649ABC-4DBC-5E37-B80D-2BB86F94F26A" xml:lang="en"><title>How to |
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use the non-modifiable buffer descriptor — TBufC<TInt></title><shortdesc>Non-modifiable buffer descriptors are useful for holding constant |
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strings or data and providing safe ways to access that data.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<ul> |
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<li id="GUID-74A075D5-195D-5BB7-BC40-D683635BE6F7"><p>For text data, it is |
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usual to construct a <codeph>TBufC<TInt></codeph> type and allow the appropriate |
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variant, either a <codeph>TBufC8<TInt></codeph> or a <codeph>TBufC16<TInt></codeph> to |
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be selected at build time.</p> </li> |
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<li id="GUID-0AA8DD41-55DF-5448-A5D5-DC403E60C3A4"><p>For binary data, an |
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explicit <codeph>TBufC8<TInt></codeph> is used.</p> </li> |
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<li id="GUID-441D5170-8C00-5BE6-AF0C-44DB149E87F1"><p>It is rare to use an |
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explicit <codeph>TBufC16<TInt></codeph>.</p> </li> |
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</ul> |
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<p>Data cannot be changed through this descriptor although it can be replaced |
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using the assignment operators.</p> |
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<p>By using the <codeph>Des()</codeph> function to construct a <codeph>TPtr/TPtr8/TPtr16</codeph> modifiable |
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pointer descriptor for the buffer's data, it becomes possible to modify that |
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data.</p> |
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<p>Although, the following notes refer to the build independent types; they |
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are equally valid for the explicit 8 bit and 16 bit types.</p> |
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<section id="GUID-5591AC50-485E-413D-B3A7-BCE59F3B634D"><title>Constructing a TBufC<TInt></title> <p>A non-modifiable |
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buffer descriptor can be constructed in a number of ways:</p> <ul> |
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<li id="GUID-8328A45B-EB36-5C80-9B3D-969DA033B71E"><p>as an empty buffer descriptor.</p> </li> |
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<li id="GUID-D0CDC7BA-A2A2-5953-8700-F43FF5FD2AE2"><p>by copying data from |
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any other type of descriptor.</p> </li> |
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<li id="GUID-A7CC00D3-16AB-5D2F-B25E-011D689C3BA9"><p>by copying data from |
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another non-modifiable buffer descriptor of the same size.</p> </li> |
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</ul> <p>The following code fragment constructs a <codeph>TBufC<16></codeph> object. |
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The buffer descriptor is uninitialised, i.e. it contains no data. The assignment |
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operator can be used to put data into the buffer descriptor after construction:</p> <codeblock id="GUID-BED8AC0B-4F0B-5859-994B-723F4B8F84A1" xml:space="preserve">_LIT(KText,"Hello World!"); |
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... |
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TBufC<16> buf1; // length of buf1 is 0 |
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buf1 = KText; // data assigned</codeblock> <p>The following code fragment |
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constructs a <codeph>TBufC<16></codeph> object, initialised with the 12 |
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characters making up the English language phrase "Hello World!".</p> <p>The |
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source descriptor is a literal which is converted to descriptor type.</p> <codeblock id="GUID-737E0C5F-AE11-586D-B81C-0E3D1AD96414" xml:space="preserve">_LIT(KText,"Hello World!"); |
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... |
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TBufC<16> buf1(KText); // length of buf1 is 12</codeblock> <p>The following |
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code fragment constructs a <codeph>TBufC<16></codeph> object, initialised |
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with the content of another <codeph>TBufC<16></codeph> object.</p> <codeblock id="GUID-A8A21448-DBE4-5F68-8CA0-57298E04036C" xml:space="preserve">_LIT(KText,"Hello World!"); |
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... |
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TBufC<16> buf1(KText); |
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TBufC<16> buf2(buf1); // data copied from descriptor buf1 |
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// length of buf2 is 12</codeblock> </section> |
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<section id="GUID-1C814D9C-5F53-4885-90B9-B83480CF623E"><title>Replacing data</title> <p>Data within a non-modifiable buffer |
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descriptor can be completely replaced by using the assignment operator:</p> <codeblock id="GUID-C3F90B27-EB1C-5864-A80A-0D0C77BB67FC" xml:space="preserve">_LIT(KText,"Hello World!"); |
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_LIT(KNewText,"New text"); |
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... |
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TBufC<16> buf1(KText); |
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TBufC<16> buf2; |
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buf2 = buf1; // buf2 now contains "Hello World!" |
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buf2 = KNewText; // buf2 now contains "New text". |
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// the literal is converted to a descriptor |
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// type.</codeblock> <p>To prevent data replacement, |
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declare <codeph>buf2</codeph> as const.</p> </section> |
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<section id="GUID-5F3BEAB3-B469-4673-A3D8-04DB697B8D0F"><title>Constructing a modifiable pointer descriptor to change the |
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data</title> <p>The data contained in non-modifiable buffer descriptor <codeph>TBufC<TInt></codeph> <i>can</i> be |
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changed by constructing a <codeph>TPtr</codeph> modifiable pointer descriptor |
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using the<codeph>Des()</codeph> member function and then changing the data |
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through that <codeph>TPtr</codeph>.</p> <p>The maximum length of the <codeph>TPtr</codeph> is |
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the value of the <codeph>TBufC<TInt></codeph> template parameter.</p> <p>The |
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following code fragment shows data being changed:</p> <codeblock id="GUID-02B09EBC-3E58-51B1-8D14-E388250A674A" xml:space="preserve">_LIT(KText,"Hello World!"); |
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_LIT(KExtraText," & Hi"); |
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TBufC<16> buf1(KText); |
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TPtr ptr = buf1.Des(); |
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25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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ptr.Delete((ptr.Length()-1),1); |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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ptr.Append(KExtraText); |
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> <p>This deletes the last character in <codeph>buf1</codeph> and |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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adds the characters " & Hi" so that <codeph>buf1</codeph> now contains |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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the text "Hello World & Hi" and its length is 16. Note that the length |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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of both <codeph>buf1</codeph> and <codeph>ptr</codeph> change to reflect the |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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data that they now both represent.</p> <p>Note that any attempt to append |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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more data raises a panic.</p> </section> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<section id="GUID-9DD4E5D1-B0A0-41BC-AE54-FC062D21173C"><title>Accessing data</title> <p>Once a non-modifiable buffer descriptor |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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has been constructed, the functions in the base class, <codeph>TDesC</codeph>, |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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are available to access the data.</p> <codeblock id="GUID-CE288FF9-26F7-533D-ADC4-E535035039B2" xml:space="preserve">_LIT(KText,"Hello World!"); |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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TBufC<16> buf1(KText); |
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> <codeblock id="GUID-656150B0-C7DF-54B7-9127-6BE685EEEA83" xml:space="preserve">buf1.Length();</codeblock> </section> |
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Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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</conbody><related-links> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<link> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<desc><xref href="GUID-7CB11EAD-260E-551A-85F1-FEAC975FE722.dita">Literal Descriptors</xref></desc> |
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Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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</link> |
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Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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</related-links></concept> |