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<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 <Etel3rdParty.h>

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->GetSignalStrength(iStatus, iSigStrengthV1Pckg);

    SetActive();

    }

void CClientApp::RunL()

    {

    if(iStatus==KErrNone)

       {

       TInt32 sigStrength = iSigStrengthV1.iSignalStrength;

       TInt8 bar = iSigStrengthV1.iBar;

       }

    }

void CClientApp::DoCancel()

    {

    iTelephony->CancelAsync(CTelephony::EGetSignalStrengthCancel);

    }</codeblock> </example> </taskbody></task>