From Forum Nokia Wiki

Header Required:

#include <aknindicatorcontainer.h>  //CAknIndicatorContainer 
#include <akneditstateindicator.h> //MAknEditingStateIndicator 
#include <aknenv.h>

Library Needed:

LIBRARY  avkon.lib //CAknIndicatorContainer

Sourrce Code:

enum TEdwinStates
{
   EAbc,   
   EAbcDictionary,
   Eabc,
   EabcDictionary,
   EABC,
   EAlphaABCDictionary,
   ENumeric123,
   EHideStateIndication
};
 
 
MAknEditingStateIndicator *editing = CAknEnv::Static()->EditingStateIndicator();
CAknIndicatorContainer *indicator = editing->IndicatorContainer();
 
TBool isDictionary = EFalse;
TInt iState
 
if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorT9)))
{ 
  isDictionary = ETrue;	  
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorQuery)))
{
  //pen mode
}
 
if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorLowerCase))&&
 isDictionary)
{      	  
  iState = EabcDictionary;
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorLowerCase)))
{	 
  iState = Eabc;
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorUpperCase)) &&
 isDictionary)
{	 
  iState = EABCDictionary;
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorUpperCase)))
{	 
  iState = EABC;    
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorTextCase))&&
 isDictionary)
{	 
  iState = EAlphaABCDictionary;     
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorTextCase)))
{	 
  iState = EAbc;     
}
else if(indicator->IndicatorState(S_uid(EAknNaviPaneEditorIndicatorNumberCase)))
{	 
  iState = ENumeric123;
}

Based on iState value you can perform necessary actions