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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-1907CF0B-2F4B-50F6-B676-7B7059B7FF74"><title>Call Hold Tutorial </title><shortdesc>This tutorial describes how to place a call on hold with the telephony API for applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> <steps id="GUID-579AD00E-9CCB-5C1E-85D7-D223535A4C7A"> <step id="GUID-BA54B3E5-B284-55C8-9709-082ADB8E1C5D"><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-B48E2268-6BFE-57A4-A46A-3913B65234BE"><cmd/><info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::GetCallDynamicCaps()</apiname></xref> to check if the device supports hold function </info> </step> <step id="GUID-15ADB36E-8D94-57EF-BBAA-6A7958A854CD"><cmd/><info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::Hold()</apiname></xref> to place a call on hold </info> <info>Pass it the ID of the call to hold. The ID is the <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::TCallId</apiname></xref> returned when you dialled or answered the call. </info> </step> <step id="GUID-82771AAC-9CBA-5029-98DA-9D95552E90F4"><cmd/><info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EHoldCancel</apiname></xref> to cancel the asynchronous request </info> </step> </steps> <example id="GUID-6068EFDB-D572-5D49-880E-FAF76EC44408"><title>Call hold example</title> <codeblock id="GUID-32D588C0-A809-5BC1-8DF4-1B9F494C19DE" 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 iCallId;

    21 

    22 public:

    23     CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallId);

    24     TInt SomeFunction();

    25 

    26 private:

    27     /*

    28        These are the pure virtual methods from CActive that  

    29        MUST be implemented by all active objects

    30        */

    31     void RunL();

    32     void DoCancel();

    33    };

    34 

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

    36     : CActive(EPriorityStandard),

    37       iTelephony(aTelephony),

    38       iCallId(aCallId)

    39     {

    40     //default constructor

    41     }

    42 

    43 TInt CClientApp::SomeFunction()

    44     {

    45     // Check that the phone supports holding calls.

    46     CTelephony::TCallCapsV1 callCapsV1;

    47     CTelephony::TCallCapsV1Pckg callCapsV1Pckg(callCapsV1);

    48     iTelephony->GetCallDynamicCaps(iCallId, callCapsV1Pckg);

    49 

    50     if( callCapsV1.iControlCaps & CTelephony::KCapsHold )

    51        {

    52        // The call represented by 'iCallId' can be put on hold

    53        iTelephony->Hold(iStatus, iCallId);

    54        SetActive();

    55        return KErrNone;

    56        }

    57     else

    58        {

    59        // The call cannot be put on hold; 

    60        // return an error indicate this.

    61        return KErrNotSupported;

    62        }

    63     }

    64 

    65 void CClientApp::RunL()

    66     {

    67     if(iStatus==KErrNone)

    68        {} // The call has been held successfully;

    69     }

    70 

    71 void CClientApp::DoCancel()

    72     {

    73     iTelephony->CancelAsync(CTelephony::EHoldCancel);

    74     }

    75 </codeblock> </example> </taskbody></task>