clocationexamplepositionrequestor.cpp

Symbian Demo, why do you want to get 20 bytes.

/*
* ============================================================================
*  Name     : clocationexamplepositionrequestor.cpp
*  Part of  : Location Example
*  Created  : 21.05.2007 by Forum Nokia
*  Description:
*  Version  : 1.0
*  Copyright: Nokia Corporation
* ============================================================================
*/

// INCLUDE FILES
#include <Lbs.h>
#include <eikenv.h>
#include <locationexample.rsg>
#include "clocationexamplepositionrequestor.h"
#include "clocationexamplepositionlistener.h"

// CONSTANTS
const TInt KSecond = 1000000;
const TInt KMaxAge = KSecond;
const TInt KErrBuffer = 100;

//The name of the requestor
_LIT(KRequestor,"LocationExample");

//Error messages
_LIT(KLbsErrLocRequest,     "Locatin req Error: %d.");
_LIT(KLbsErrAccess,         "No Location access Error: %d.");
_LIT(KLbsErrPosServConn,    "Location Server Error: %d.");
_LIT(KLbsErrOpenPos,        "Location Server Error: %d.");
_LIT(KLbsErrSetRequestor,   "Location req Error: %d.");
_LIT(KLbsErrSetUpOpt,       "Location update Error: %d.");
_LIT(KLbsErrCanceled,       "Location Cancelled.");



// -----------------------------------------------------------------------------
// CLocationExamplePositionRequestor::CLocationExamplePositionRequestor
// C++ default constructor can NOT contain any code, that
// might leave.
// -----------------------------------------------------------------------------
//
CLocationExamplePositionRequestor::CLocationExamplePositionRequestor(TInt aInterval, MPositionObserver& aPositionListener )
    : CActive(CActive::EPriorityStandard),
    iInterval(aInterval),
    iPositionListener( aPositionListener ),
    iPosInfoBase( &iPositionInfo ),
    iGettingLastknownPosition( ETrue )
    {
    }


// -----------------------------------------------------------------------------
// CLocationExamplePositionRequestor::ConstructL
// Symbian 2nd phase constructor can leave.
// -----------------------------------------------------------------------------
//
void CLocationExamplePositionRequestor::ConstructL()
    {
    // Set update interval to one second to receive one position data per second
    iUpdateops.SetUpdateInterval(TTimeIntervalMicroSeconds(iInterval));

    // If position server could not get position
    // In two minutes it will terminate the position request
    iUpdateops.SetUpdateTimeOut(TTimeIntervalMicroSeconds(iUpdateTimeout));

    // Positions which have time stamp below KMaxAge can be reused
    iUpdateops.SetMaxUpdateAge(TTimeIntervalMicroSeconds(KMaxAge));

    // Enables location framework to send partial position data
    iUpdateops.SetAcceptPartialUpdates(ETrue);

    // Add this position requestor to the active scheduler
    CActiveScheduler::Add( this );
    
    // Initialise the position request sequence
    DoInitialiseL();
    }

// -----------------------------------------------------------------------------
// CLocationExamplePositionRequestor::NewL
// Two-phased constructor.
// -----------------------------------------------------------------------------
//
CLocationExamplePositionRequestor* CLocationExamplePositionRequestor::NewL(TInt aInterval,
                                        MPositionObserver& aPositionListener )
    {
    //Create the object
    CLocationExamplePositionRequestor* self = new( ELeave ) CLocationExamplePositionRequestor(
        aInterval, aPositionListener);

    //Push to the cleanup stack
    CleanupStack::PushL( self );

    //Construct the object
    self->ConstructL();

    //Remove from cleanup stack
    CleanupStack::Pop( self );

    //Return pointer to the created object
    return self;
    }

// -----------------------------------------------------------------------------
// CLocationExamplePositionRequestor::~CLocationExamplePositionRequestor
// Destructor
// -----------------------------------------------------------------------------
//
CLocationExamplePositionRequestor::~CLocationExamplePositionRequestor()
    {
    // Cancel active object
    Cancel();

    // Close the positioner
    iPositioner.Close();

    // Close the session to the position server
    iPosServer.Close();
    }

// -----------------------------------------------------------------------------
// DoCancel() implements CActive DoCancel()
// Implements the cancellation of an outstanding request.
// -----------------------------------------------------------------------------
//
void CLocationExamplePositionRequestor::DoCancel()
    {
    // When a client application wishes to close one of its connections to Location
    // Server, there can be no outstanding requests on that particular connection
    // If a client application attempts to close a connection before outstanding
    // requests have been cancelled or completed, it is panicked

    //If we are getting the last known position
    if ( iGettingLastknownPosition )
        {
        //Cancel the last known position request
        iPositioner.CancelRequest(EPositionerGetLastKnownPosition);
        }
    else
        {
        iPositioner.CancelRequest(EPositionerNotifyPositionUpdate);
        }
    }

// -----------------------------------------------------------------------------
// RunL() implements CActive RunL()
// Handles an active object抯 request completion event.
// -----------------------------------------------------------------------------
//
void CLocationExamplePositionRequestor::RunL()
    {
    TBuf<KPositionMaxModuleName> buffer;
    
    switch ( iStatus.Int() )
        {
        // The fix is valid
        case KErrNone:
        // The fix has only partially valid information.
        // It is guaranteed to only have a valid timestamp
        case KPositionPartialUpdate:
            {

            // Pre process the position information
            PositionUpdatedL();
            break;
            }
        // The data class used was not supported
        case KErrArgument:
            {
            // Set info base to position info
            iPosInfoBase = &iPositionInfo;

             // Request next position
            iPositioner.NotifyPositionUpdate( *iPosInfoBase, iStatus );

            // Set this object active
            SetActive();
            break;
            }
        // The position data could not be delivered
        case KPositionQualityLoss:
            {
            // Send event to position listener
            HBufC* text = CEikonEnv::Static()->AllocReadResourceAsDes16LC(R_POSITION_QUALITY_ERROR_TEXT);
            iPositionListener.ErrorL(*text);
            CleanupStack::PopAndDestroy(text); 

            if ( iGettingLastknownPosition )
                {
                //Change the data class type
                iPosInfoBase = &iSatelliteInfo;
                }

            // Request position
            iPositioner.NotifyPositionUpdate( *iPosInfoBase, iStatus );

            // Set this object active
            SetActive();
            break;
            }
        // Access is denied
        case KErrAccessDenied:
            {
            // Send error to position listener
            buffer.Format(KLbsErrAccess, iStatus.Int());
            iPositionListener.ErrorL(buffer);
            break;
            }
        // Request timed out
        case KErrTimedOut:
            {
            // Send error to position listener
            HBufC* text = CEikonEnv::Static()->AllocReadResourceAsDes16LC(R_POSITION_TIMEOUT_TEXT);
            iPositionListener.ErrorL(*text);
            CleanupStack::PopAndDestroy(text); 

            if ( iGettingLastknownPosition )
                {
                //Change the data class type
                iPosInfoBase = &iSatelliteInfo;
                }

            // Request position
            iPositioner.NotifyPositionUpdate( *iPosInfoBase, iStatus );

            // Set this object active
            SetActive();
            break;
            }
        // The request was canceled
        case KErrCancel:
            {
            // Send error to position listener
            iPositionListener.ErrorL( KLbsErrCanceled );
            break;
            }