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

<task id="GUID-047E3462-F806-4C54-9DC5-6B78907CA949" xml:lang="en"><title>Derive

a class and implement the appropriate observer functions</title><prolog><metadata><keywords/></metadata></prolog><taskbody>

<context>       <p>Derive a class from one or more of the observer interfaces

above, and implement the appropriate observer functions.</p><p>The following

code snippet demonstrates how to derive a class and implement the appropriate

functions.</p><codeblock id="GUID-FF4BD289-9ECC-5E01-A38C-3E428817883E" xml:space="preserve">#include HWRMPower.h

Class CPowerApp : public CBase,

                  public MHWRMBatteryPowerObserver,

                  public MHWRMBatteryChargingStatusObserver

{

public:

    CPowerApp(); //constructor

    ~CPowerApp();  //destructor

    void ConstructL();

    static CPowerApp* NewL();

    // from MHWRMBatteryPowerObserver

    virtual void PowerMeasurement( TInt aErr,

                                   TInt aMeasurement );

    // from MHWRMBatteryChargingStatusObserver

    virtual void ChargingStatusChange( Tint aErrCode,

                                       CHWRMPower::TBatteryChargingStatus aChrgStatus );

private:

    CHWRMPower* iPower;

};

//Implementation of MHWRMBatteryPowerObserver::PowerMeasurement()

void CPowerApp::PowerMeasurement( TInt aErr,

                                  TInt aMeasurement )

    {

    if( aErrorCode == KErrNone )

         {

         INFO_PRINTF2( _L( "INFO: Power Consumption Measurement Received,

                            measurement=%d" ), aMeasurement );

         }

    else

         {

         INFO_PRINTF2( _L( "INFO: Power Consumption Measurement Error,

                            error=%d" ), aErr );

         }

    }</codeblock></context>