author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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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-CD87FAF6-A11D-4260-9472-CABA18BF86B1" xml:lang="en"><title>Creating |
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a light instance</title><prolog><metadata><keywords/></metadata></prolog><taskbody> |
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<context> <p>Create an instance of <codeph>CHWRMLight</codeph> instance |
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using <codeph>NewL()</codeph> or <codeph>NewLC()</codeph> methods. After creating |
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the instance, lights can be directly controlled via the provided class methods.</p><p><b>Without |
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notify handling</b></p><p>Create an instance of the <codeph>CHWRMLight</codeph> implementation |
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class using the <codeph>NewL()</codeph> or <codeph>NewLC()</codeph> constructor |
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without a parameter.</p><p>The following code snippet demonstrates how to |
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create an instance without notify handling to control the lights of the device:</p><codeblock xml:space="preserve">CHWRMLight* light = CHWRMLight::NewLC(); // No callbacks</codeblock><p><b>With notify handling </b></p><p>Derive a class from the <codeph>MHWRMLightObserver</codeph> interface |
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and implement the <codeph>LightStatusChanged()</codeph> method.</p><p>The |
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following code snippet is an example of the header of the class implemented |
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by the client:</p><codeblock xml:space="preserve">// INCLUDES |
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#include HWRMLight.h // Link against HWRMLightClient.lib. |
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class CLightStatusObserver : public CBase, |
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public MHWRMLightObserver |
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{ |
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public: |
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CLightStatusObserver(); |
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~CLightStatusObserver(); |
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void ConstructL(); |
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static CLightStatusObserver* NewL(); |
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//from MHWRMLightObserver |
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virtual void LightStatusChanged( TInt aTarget, |
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CHWRMLight::TLightStatus aStatus ); |
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private: |
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CHWRMLight* iLight; |
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};</codeblock><p>Create an instance of the <codeph>CHWRMLight</codeph> implementation |
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class using the <codeph>NewL()</codeph> or <codeph>NewLC()</codeph> constructor |
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with a parameter. This parameter is a pointer to an object that is derived |
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from <codeph>MHWRMLightObserver</codeph>. After this, lights can be directly |
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controlled through the provided class methods. Every light status change causes |
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a notification using <codeph>MHWRMLightObserver::LightStatusChanged()</codeph>.</p><p>The |
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following code snippet demonstrates how to create an instance with notify |
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handling to control the lights of the device:</p><codeblock xml:space="preserve">void CLightStatusObserver::ConstructL() |
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{ |
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iLight = CHWRMLight::NewL( this ) |
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}</codeblock></context> |
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</taskbody></task> |