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

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();		
}