Symbian3/PDK/Source/GUID-B432A48B-46CE-4FD4-880E-DA15AA304CAA.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Fri, 22 Jan 2010 18:26:19 +0000
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permissions -rw-r--r--
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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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-B432A48B-46CE-4FD4-880E-DA15AA304CAA" xml:lang="en"><title>Adding,
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removing, and accessing header field parameters</title><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-D96EA794-4D54-4F15-B839-EBA42687751F"> <p>Parameters can be associated with header field parts at the time
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of adding the part. There are two variants of <xref href="GUID-54F9A87B-FE2F-3429-9793-0A24B83466B9.dita#GUID-54F9A87B-FE2F-3429-9793-0A24B83466B9/GUID-A8708AE6-8EAE-37C9-BAD2-87E4A7DCE266"><apiname>RHTTPHeaders::SetFieldL()</apiname></xref>:
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the first is described previously. The second variant takes four parameters,
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of which two specify the part name/value and two specify the parameter name/value. </p> <p>To
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associate more than one parameter with the part, the function must be invoked
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repeatedly. This does not create duplicate parts; rather it locates the part
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with the specified value, and then adds additional parameters. </p> <p>To
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remove parameters from header parts, the entire part must be removed using <xref href="GUID-54F9A87B-FE2F-3429-9793-0A24B83466B9.dita#GUID-54F9A87B-FE2F-3429-9793-0A24B83466B9/GUID-656EF7AC-479E-3408-B00C-9FAE3022A37B"><apiname>RHTTPHeaders::RemoveFieldPart()</apiname></xref>,
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and then added again. </p> <p>To access parameter values, the header name
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and parameter name must be specified. <xref href="GUID-54F9A87B-FE2F-3429-9793-0A24B83466B9.dita#GUID-54F9A87B-FE2F-3429-9793-0A24B83466B9/GUID-AAEA368C-D8E6-365E-8B05-31CC812F0469"><apiname>RHTTPHeaders::GetParam()</apiname></xref> is
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used, and has an optional fourth parameter in which the part index can be
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provided. If not, the API assumes that the first header part contains the
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parameter. </p> <p>The following code from <filepath>HTTPEXAMPLECLIENT</filepath> illustrates
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the use of header parameters with the <codeph>WWW-Authenticate</codeph> header: </p> <codeblock id="GUID-DAD45847-DD81-54D3-AD90-C40A5F7ABC45" xml:space="preserve">// Display realm for WWW-Authenticate header
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            RStringF wwwAuth = strP.StringF(HTTP::EWWWAuthenticate,RHTTPSession::GetTable());
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            if (fieldNameStr == wwwAuth)
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                {
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                // check the auth scheme is 'basic'
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                RStringF basic = strP.StringF(HTTP::EBasic,RHTTPSession::GetTable());
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                RStringF realm = strP.StringF(HTTP::ERealm,RHTTPSession::GetTable());
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                THTTPHdrVal realmVal;
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                if ((fieldVal.StrF() == basic) &amp;&amp; 
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                    (!hdr.GetParam(wwwAuth, realm, realmVal)))
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                    {
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                    RStringF realmValStr = strP.StringF(realmVal.StrF());
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                    fieldVal16.Copy(realmValStr.DesC());
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                    iUtils.Test().Printf(_L("Realm is: %S\n"), &amp;fieldVal16);
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                    realmValStr.Close();
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                    }
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                basic.Close();
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                realm.Close();
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                }
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            wwwAuth.Close();</codeblock> </section>
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</conbody></concept>