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  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">
<task xml:lang="en" id="GUID-AC5665B4-8E33-58A3-824B-6CC40E13160A"><title>Signal Strength Information Tutorial</title><shortdesc>This tutorial describes how to get the signal strength information with the telephony API for applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> <steps id="GUID-118619CA-9C07-578D-B36A-0CEDA713DEF6"> <step id="GUID-C52B6FA6-6291-5222-8943-C2AF63432054"><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-7AF254B4-BBDE-5F65-801E-95E39353CDDB"><cmd/><info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::GetSignalStrength()</apiname></xref> to get the signal strength information </info> </step> <step id="GUID-A9D065A3-6247-5600-9501-F0D78367D874"><cmd/><info>you can cancel the asynchronous request with a <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>EGetSignalStrengthCancel</apiname></xref> </info> </step> <step id="GUID-46E2E940-FFC4-5C20-A809-65966C993A0E"><cmd/><info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::ESignalStrengthChange</apiname></xref> to get the notification of any changes to the signal strength information </info> </step> <step id="GUID-99E58056-7B48-5439-B084-4E06CABC49D0"><cmd/><info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::ESignalStrengthChangeCancel</apiname></xref> to cancel the notification request. </info> </step> </steps> <example id="GUID-7D719A16-CC6E-59F8-9B2B-ED7A8E9EC516"><title>Signal strength example</title> <codeblock id="GUID-E35C1AE7-A832-57DB-8600-E1CA73F0B308" xml:space="preserve">#include &lt;e32base.h&gt;
#include &lt;Etel3rdParty.h&gt;

class CClientApp : public CActive
    { 

private:
    CTelephony* iTelephony;
    CTelephony::TSignalStrengthV1 iSigStrengthV1;
    CTelephony::TSignalStrengthV1Pckg iSigStrengthV1Pckg;

public:
    CClientApp(CTelephony* aTelephony);
    void SomeFunction();

private:
    /*
       These are the pure virtual methods from CActive that  
       MUST be implemented by all active objects
       */
    void RunL();
    void DoCancel();
   };

CClientApp::CClientApp(CTelephony* aTelephony)
    : CActive(EPriorityStandard),
      iTelephony(aTelephony),
      iSigStrengthV1Pckg(iSigStrengthV1)
    {
    //default constructor
    }

void CClientApp::SomeFunction()
    {
    iTelephony-&gt;GetSignalStrength(iStatus, iSigStrengthV1Pckg);
    SetActive();
    }

void CClientApp::RunL()
    {
    if(iStatus==KErrNone)
       {
       TInt32 sigStrength = iSigStrengthV1.iSignalStrength;
       TInt8 bar = iSigStrengthV1.iBar;
       }
    }

void CClientApp::DoCancel()
    {
    iTelephony-&gt;CancelAsync(CTelephony::EGetSignalStrengthCancel);
    }</codeblock> </example> </taskbody></task>