From Forum Nokia Wiki

This known issue was originally created by Alammi and has been verified by Forum Nokia.

ID	KIS000850	Creation date	March 25, 2008
Platform	S60 3rd Edition, Feature Pack 1	Devices	Nokia N95, Nokia E90 Communicator, Nokia 6110 Navigator
Category	Symbian C++	Subcategory	Location-based Services

Keywords (APIs, classes, methods, functions):

Overview

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.

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.