Archived:RPositioner::NotifyPositionUpdate returns KErrInUse after few minutes (Known Issue)

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Trying to use RPositioner::NotifyPositionUpdate() to receive GPS position fails after a certain number of updates have been made, if update options have been omitted. This known issue has been verified by Nokia Developer.

Article Metadata

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Tested with

Devices(s): Nokia N95, Nokia E90 Communicator, Nokia 6110 Navigator

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Compatibility

Platform(s): S60 3rd Edition, Feature Pack 1

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Article

Created: alammi (30 Nov 2007)

Last edited: hamishwillee (21 Jun 2012)

Description

Approximately after 4-5 minutes (255 update cycles), RPositioner::NotifyPositionUpdate() completes with error KErrInUse (-14). This happens when the client has not set valid update options with RPositioner::SetUpdateOptions().

This is not the defined return value for this API. After returning KErrInUse the RPositioner has "died" and always returns KErrInUse.

Note that the problem does not appear when using a Bluetooth GPS through the Location Acquisition API, or on the emulator.

How to reproduce

Header file:

  class CMyPositioner : public CActive 
    {
    ...
 
    RPositionServer iPositionServer;
    RPositioner iPositioner;
    TPositionSatelliteInfo iSatelliteInfo;
    };

Implementation:

  _LIT(KRequestor, "MyPositioner");
 
  void CMyPositioner::ConstructL()
    {
    ...
    User::LeaveIfError( iPositionServer.Connect() );
    User::LeaveIfError( iPositioner.Open(iPositionServer) );
    User::LeaveIfError( iPositioner.SetRequestor( CRequestor::ERequestorService, 
                                                  CRequestor::EFormatApplication,
                                                  KRequestor) );
    CActiveScheduler::Add( this );
    }
 
 
  void CMyPositioner::StartL()
    {
    ...
    iPositioner.NotifyPositionUpdate( iSatelliteInfo, iStatus );
    SetActive();
    }
 
 
  void CMyPositioner::RunL()
    {
  	 if (iStatus == KErrNone)
  		  {
  		  // Got iSatelliteInfo successfully, handle it
  			HandleSatelliteInfo();
 
  			// Request next update
  			iPositioner.NotifyPositionUpdate(iSatelliteInfo, iStatus);
  			SetActive();
  		  }
  		else
  		  {
  		  // Fails with KErrInUse (-14) after 255 cycles
  		  _LIT( KDebugMessage, "NotifyPositionUpdate() failed: %d" ); 
        RDebug::Print( KDebugMessage, iStatus.Int() );
  		  }
    }

Solution

Set valid update options with RPositioner::SetUpdateOptions() prior to calling RPositioner::NotifyPositionUpdate():

  iPositioner.SetUpdateOptions(
      TPositionUpdateOptions( '''aInterval''',
                              TTimeIntervalMicroSeconds(0), /* timeout */
                              TTimeIntervalMicroSeconds(0), /* max age */
                              aAcceptPartialUpdates));
 
  iPositioner.NotifyPositionUpdate( iSatelliteInfo, iStatus );
  SetActive();
  ...

Note that the update interval (aInterval) value must be non-zero.