author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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 task |
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PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd"> |
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<task id="GUID-60EE22AA-402D-4FC2-9AD1-B3AEF822E8DC" xml:lang="en"><title>Receiving |
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Channel Data based on Conditions</title><shortdesc>Conditional listening enables you to receive sensor data feeds |
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based on a specific condition. For example, you can choose to receive sensor |
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feeds that are only movement specific.</shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> |
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<prereq id="GUID-A4F41A1D-D093-418E-BA65-30C36DA0B0DA"> <p>Before listening |
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for channel data, you must <xref href="GUID-4B709839-8EEF-4AD2-9868-9AF0176B1E5B.dita#GUID-4B709839-8EEF-4AD2-9868-9AF0176B1E5B/GUID-FBBD3A8B-F240-4DC0-B516-3A51FDD86A88">open |
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the sensor channel</xref>.</p> </prereq> |
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<steps id="GUID-4DD07DEC-6017-4237-BE46-1D69E5FBD744-GENID-1-6-1-8-1-1-6-1-4-1-4-1-10-1-3-2"> |
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<step id="GUID-9A69E5AD-E938-4092-A8C2-CB65C37C8962-GENID-1-6-1-8-1-1-6-1-4-1-4-1-10-1-3-2-1"><cmd>Create channel condition |
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items using <parmname>CSensrvChannelCondition</parmname> constructor. These |
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conditions can be used to filter the sensor data feeds.</cmd> |
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<stepxmp><codeblock xml:space="preserve">//Comparison values needed for condition |
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... |
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TInt firstNumber=45; |
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HBufC8 *firstBufNumber=NULL; |
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InetProtTextUtils::ConvertIntToDescriptorL(firstNumber,firstBufNumber); |
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CleanupStack::PushL(firstBufNumber); |
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TInt secondNumber=150; |
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HBufC8 *secondBufNumber=NULL; |
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InetProtTextUtils::ConvertIntToDescriptorL(secondNumber,secondBufNumber); |
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CleanupStack::PushL(secondBufNumber); |
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//Creates a SingleLimit Condition with a GreaterThan operator |
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CSensrvChannelCondition *firstCondition = CSensrvChannelCondition::NewL(ESensrvSingleLimitCondition,ESensrvOperatorGreaterThan,1,*firstBufNumber); |
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//Creates a SingleLimit Condition with a LessThan operator |
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CSensrvChannelCondition *secondCondition = CSensrvChannelCondition::NewL(ESensrvSingleLimitCondition,ESensrvOperatorLessThan,2,*secondBufNumber);</codeblock></stepxmp> |
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</step> |
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<step id="GUID-A94F1F87-9CD4-45E9-9FDA-B53E26C8F92D"><cmd>Create a channel |
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condition set using <parmname>CSensrvChannelConditionSet</parmname> constructor. |
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Add the condition items to the condition set using the <xref href="GUID-AF4BAE05-7111-3DF7-964D-C8A49D8F3D08.dita#GUID-AF4BAE05-7111-3DF7-964D-C8A49D8F3D08/GUID-84740BEB-2E6E-38E6-822B-9F6E4A55DF7D"><apiname>CSensrvChannelConditionSet::AddConditionL()</apiname></xref> function.</cmd> |
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<stepxmp><codeblock xml:space="preserve">//Creates a ConditionSet with ConditionType OR |
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CSensrvChannelConditionSet *ConditionSet=CSensrvChannelConditionSet::NewLC(ESensrvAndConditionSet); |
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//Add channel1 and channel2 to conditonset |
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ConditionSet->AddChannelConditionL(firstCondition); |
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ConditionSet->AddChannelConditionL(secondCondition);</codeblock></stepxmp> |
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</step> |
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<step id="GUID-E51A9E16-67C8-43AB-BBEF-99411A3EEE0F"><cmd>Add the condition |
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set to the required channel using the <xref href="GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844.dita#GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844/GUID-006A659E-72F1-3D5D-8476-952619E3BA2F"><apiname>CSensrvChannel::AddConditionL()</apiname></xref> function.</cmd> |
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<stepxmp><codeblock xml:space="preserve">CSensrvChannel* channel; |
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channel->AddConditionL(*ConditionSet); |
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</codeblock></stepxmp> |
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</step> |
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<step id="GUID-47EED068-A9C7-4DCF-AF03-3803CECAE7C8"><cmd>Create a condition |
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listener implementation for the <parmname>MSensrvChannelConditionListener</parmname> interface, |
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which listens for sensor data feeds based on <parmname>CSensrvChannelConditionSet</parmname>.</cmd> |
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<stepxmp><codeblock xml:space="preserve">class ConditionListener:public MSensrvChannelConditionListener |
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{ |
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public: |
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void ConditionMet(CSensrvChannel &aChannel, CSensrvChannelConditionSet &aChannelConditionSet, TDesC8 &avalue) |
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{ |
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... |
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//Implementation |
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} |
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void ConditionError(CSensrvChannel &aChannel, TSensrvErrorSeverity aError) |
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{ |
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... |
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//Implementation |
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} |
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void GetChannelConditionListenerInterfaceL(TUid aInterfaceUid, TAny *&aInterface) |
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{ |
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... |
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//Implementation |
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} |
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};</codeblock></stepxmp> |
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</step> |
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<step id="GUID-196F04E0-2A98-4479-8165-9A803823E6AD"><cmd>Start conditional |
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listening by passing an instance of the condition listener implementation, |
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using the <xref href="GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844.dita#GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844/GUID-4CA77329-E958-3568-B34D-1086AA34A334"><apiname>CSensrvChannel::StartConditionListeningL()</apiname></xref> function.</cmd> |
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<stepxmp><codeblock xml:space="preserve">//Instance of the condition listener implementation |
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ConditionListener conditionListener; |
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... |
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channel->StartConditionListeningL(conditionListener,1,1); |
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...</codeblock></stepxmp> |
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</step> |
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<step id="GUID-93BD0200-C12B-4AB1-9D23-F11AC54D39E6"><cmd>Once you get the |
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required sensor data feeds from the sensor channel based on the conditions |
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set, you can stop conditional listening using the <xref href="GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844.dita#GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844/GUID-78F64EA2-2901-3304-B4AE-B865D18772E8"><apiname>CSensrvChannel::StopConditionListening()</apiname></xref> function.</cmd> |
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<stepxmp><codeblock xml:space="preserve">channel->StopConditionListening(); |
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</codeblock></stepxmp> |
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</step> |
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</steps> |
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<postreq id="GUID-40C4B810-AD44-4A28-8C29-8A08E914970D"><p>End the session |
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with the sensor channel using the <xref href="GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844.dita#GUID-22DC917F-D833-3531-AB2D-A6E2D52EF844/GUID-0B8F50A6-2CA1-316A-82AB-AA026005E810"><apiname>CSensrvChannel::CloseChannel()</apiname></xref> function.</p></postreq> |
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</taskbody></task> |