code: def getApplicationKeyByIndex(self, unApplicationIndex, pchAppKeyBuffer, unAppKeyBufferLen):
          
  
          fn = self.function_table.getApplicationKeyByIndex
          result = fn(unApplicationIndex, pchAppKeyBuffer, unAppKeyBufferLen)
          return result
docs: Returns the key of the specified application. The index is at least 0 and is less than the return 
          value of GetApplicationCount(). The buffer should be at least k_unMaxApplicationKeyLength in order to 
          fit the key.