Available positioning modules

Comments

26 Sep
2009

Article Review by User:FireSwarog (20090926)

With the help of the code snippet from this article you can obtain list of availbale positioning modules and also you can identify which module is currently used by default. This is an important and useful information in many cases, especially when you are developing LBS-application. You can apply fine-tuning of your LBS-application depending on the default module type.

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The following code snippet demonstrates how to obtain list of the available positioning modules using Symbian C++.

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Article

Created: Den123 (20 Apr 2008)

Last edited: hamishwillee (07 Feb 2012)

Headers:

#include <lbs.h>

Libraries:

LIBRARY       lbs.lib 
LIBRARY       bafl.lib //for CDesCArrayFlat

// Position server
RPositionServer posServer;
User :: LeaveIfError( posServer.Connect() );
CleanupClosePushL( posServer );
 
// get default module UID
TPositionModuleId defModuleUid;
User :: LeaveIfError( posServer.GetDefaultModuleId( defModuleUid ) );
 
// get count of available modules
TUint numOfModules = 0;
User :: LeaveIfError( posServer.GetNumModules( numOfModules )  );
if( numOfModules )
{
   // array for storing 
   CDesCArrayFlat* itemArray = new ( ELeave ) CDesCArrayFlat( numOfModules );
   CleanupStack :: PushL( itemArray );
 
   _LIT( KDefault, "* " ); // default module mark
   _LIT( KGeneral, "- " ); // general module mark
   const TInt KMaxModuleNameLen = 128;
   for( TUint i = 0; i < numOfModules; i++ )
   {
      // read current module info
      TPositionModuleInfo moduleinfo;
      posServer.GetModuleInfoByIndex ( i, moduleinfo );
 
      // read current module name 
      TBuf< KMaxModuleNameLen > moduleName;
      moduleinfo.GetModuleName( moduleName );  				   
 
      // insert marker "*" or "-"
      moduleName.Insert( 0, moduleinfo.ModuleId() == defModuleUid ? 
                            KDefault : KGeneral );
 
      // append to array
      itemArray->AppendL( moduleName );
   }			   
   ShowListL( itemArray );		   			   
   CleanupStack :: PopAndDestroy(); // itemArray
}
 
CleanupStack :: PopAndDestroy(); // posServer

ShowListL function can be implemented as follows:

Headers:

#include <aknlists.h>

Libraries:

LIBRARY       avkon.lib
LIBRARY       eikcoctl.lib
LIBRARY       eikctl.lib

void YourClass :: ShowListL( CDesCArray* anArray )
{	
   // create CEikTextListBox instance, list
   CEikTextListBox* list = new( ELeave ) CAknSinglePopupMenuStyleListBox;
 
   // push list'pointer to CleanupStack.
   CleanupStack::PushL( list );
 
   // create CAknPopupList instance, popupList
   CAknPopupList* popupList = CAknPopupList::NewL( list, 
                                      		   R_AVKON_SOFTKEYS_OK_EMPTY,
                                                   AknPopupLayouts::EMenuWindow );
   // push popupList'pointer to CleanupStack.
   CleanupStack::PushL( popupList );
 
   // initialize listbox.
   list->ConstructL( popupList, CEikListBox::ELeftDownInViewRect );
   list->CreateScrollBarFrameL( ETrue );
   list->ScrollBarFrame()->SetScrollBarVisibilityL( CEikScrollBarFrame::EOff, 
                                                    CEikScrollBarFrame::EAuto );
 
   // set listitems.
   CTextListBoxModel* model = list->Model();
   model->SetItemTextArray( anArray );
   model->SetOwnershipType( ELbmDoesNotOwnItemArray );
 
   // show popup list and then show return value.
   popupList->ExecuteLD();
 
   // pop the popupList's pointer from CleanupStack
   CleanupStack::Pop();
 
   // pop and Destroy the list's pointer from CleanupStack
   CleanupStack::PopAndDestroy();		
}