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     7     Nokia Corporation - initial contribution.

     8 Contributors: 

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    10 <!DOCTYPE task

    11   PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">

    12 <task xml:lang="en" id="GUID-E2D4973C-FE93-5DE7-B04E-19B7701621C3"><title>Call Swap Tutorial </title><shortdesc>This tutorial describes how to swap calls with the telephony API for applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> <steps id="GUID-B8135064-5C8F-5EE1-9F58-9A8A9CCED402"> <step id="GUID-87A34CB4-69CB-59EB-BE40-E4CFD64334BB"><cmd/><info>create a new instance of <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony</apiname></xref>  </info> </step> <step id="GUID-A3EB36C9-9856-5AA4-8E64-6BE8282CEAB1"><cmd/><info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::GetCallDynamicCaps()</apiname></xref> to check if the device supports swap function </info> </step> <step id="GUID-135949F6-5864-5BD4-A8B1-253CE994AB44"><cmd/><info>call <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::Swap()</apiname></xref> when you have an active call and a call on hold </info> <info>The function makes the held call active and the puts the active call on hold. Pass the function the IDs of the two calls. The IDs are <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::TCallId</apiname></xref> objects returned when you dialled or answered the calls. </info> </step> <step id="GUID-2B849097-C643-59E7-95FA-708061ED71E3"><cmd/><info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::ESwapCancel</apiname></xref> to cancel the asynchronous request </info> </step> </steps> <example id="GUID-24851381-E70A-53F5-AFDB-41B5D8DEB172"><title>Call swap example</title> <codeblock id="GUID-D28043B3-811B-5A73-B42B-E79A5BCCC481" xml:space="preserve">#include &lt;e32base.h&gt;

    13 #include <Etel3rdParty.h>

    14 

    15 class CClientApp : public CActive

    16     { 

    17 

    18 private:

    19     CTelephony* iTelephony;

    20     CTelephony::TCallId iCallIdA;

    21     CTelephony::TCallId iCallIdB;

    22 

    23 public:

    24     CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallIdA, CTelephony::TCallId aCallIdB);

    25     TInt SomeFunction();

    26 

    27 private:

    28     /*

    29        These are the pure virtual methods from CActive that  

    30        MUST be implemented by all active objects

    31        */

    32     void RunL();

    33     void DoCancel();

    34    };

    35 

    36 CClientApp::CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallId)

    37     : CActive(EPriorityStandard),

    38       iTelephony(aTelephony),

    39       iCallIdA(aCallIdA)

    40       iCallIdB(aCallIdB)

    41     {

    42     //default constructor

    43     }

    44 

    45 TInt CClientApp::SomeFunction()

    46     {

    47     // Check that the phone supports Resuming calls.

    48     CTelephony::TCallCapsV1 callCapsV1;

    49     CTelephony::TCallCapsV1Pckg callCapsV1Pckg(callCapsV1);

    50     iTelephony->GetCallDynamicCaps(iCallId, callCapsV1Pckg);

    51 

    52     if( callCapsV1.iControlCaps & CTelephony::KCapsSwap )

    53        {

    54        // The call represented by 'iCallId' can be swapped

    55        iTelephony->Swap(iStatus, iCallIdA, iCallIdB);

    56        SetActive();

    57        return KErrNone;

    58        }

    59     else

    60        {

    61        // The call cannot be swapped; 

    62        // return an error indicate this.

    63        return KErrNotSupported;

    64        }

    65     }

    66 

    67 void CClientApp::RunL()

    68     {

    69     if(iStatus==KErrNone)

    70        {} // The call has been swapped successfully;

    71     }

    72 

    73 void CClientApp::DoCancel()

    74     {

    75     iTelephony->CancelAsync(CTelephony::ESwapCancel);

    76     }

    77 </codeblock> </example> </taskbody></task>