Symbian3/SDK/Source/GUID-FFBD95C6-0B12-5FD7-BA69-89BBFB97F0A1.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 21 Jan 2010 18:18:20 +0000
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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-FFBD95C6-0B12-5FD7-BA69-89BBFB97F0A1" xml:lang="en"><title>Call
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Resume Tutorial </title><shortdesc>This tutorial describes how to resume a call with the telephony
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API for applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>
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<steps id="GUID-43E11818-C05F-53B4-8DCB-7246BAE47AC8">
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<step id="GUID-DF620D49-997B-5780-A7E7-EAD2CBEDBC40"><cmd/>
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<info>create a new instance of <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony</apiname></xref>  </info>
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</step>
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<step id="GUID-C5296605-2F1B-5084-B34B-F764F358AF27"><cmd/>
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<info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::GetCallDynamicCaps()</apiname></xref> to
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check if the device supports resume function </info>
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</step>
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<step id="GUID-F93FC655-7405-5BD5-9CA3-A15D09D889B5"><cmd/>
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<info>once a call is on hold, you can resume the call by with <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::Resume()</apiname></xref>. </info>
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<info>Pass the ID of the call to resume. </info>
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</step>
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<step id="GUID-04EC72AA-318C-5BFE-A8AD-374929229D50"><cmd/>
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<info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EResumeCancel</apiname></xref> to
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cancel the asynchronous request </info>
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</step>
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</steps>
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<example id="GUID-BFF56F2B-E7D7-5CA4-9130-AE4FC768431A"><title>Call resume
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example</title> <codeblock id="GUID-71F14CC1-40DF-5A89-9A6F-D8D31F544FFF" xml:space="preserve">#include &lt;e32base.h&gt;
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#include &lt;Etel3rdParty.h&gt;
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class CClientApp : public CActive
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    { 
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private:
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    CTelephony* iTelephony;
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    CTelephony::TCallId iCallId;
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public:
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    CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallId);
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    TInt SomeFunction();
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private:
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    /*
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       These are the pure virtual methods from CActive that  
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       MUST be implemented by all active objects
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       */
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    void RunL();
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    void DoCancel();
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   };
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CClientApp::CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallId)
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    : CActive(EPriorityStandard),
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      iTelephony(aTelephony),
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      iCallId(aCallId)
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    {
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    //default constructor
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    }
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TInt CClientApp::SomeFunction()
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    {
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    // Check that the phone supports Resuming calls.
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    CTelephony::TCallCapsV1 callCapsV1;
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    CTelephony::TCallCapsV1Pckg callCapsV1Pckg(callCapsV1);
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    iTelephony-&gt;GetCallDynamicCaps(iCallId, callCapsV1Pckg);
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    if( callCapsV1.iControlCaps &amp; CTelephony::KCapsResume )
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       {
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       // The call represented by 'iCallId' can be resumed
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       iTelephony-&gt;Resume(iStatus, iCallId);
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       SetActive();
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       return KErrNone;
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       }
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    else
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       {
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       // The call cannot be resumed; 
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       // return an error indicate this.
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       return KErrNotSupported;
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       }
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    }
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void CClientApp::RunL()
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    {
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    if(iStatus==KErrNone)
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       {} // The call has been resumed successfully;
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    }
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void CClientApp::DoCancel()
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    {
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    iTelephony-&gt;CancelAsync(CTelephony::EResumeCancel);
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    }
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</codeblock> </example>
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</taskbody></task>