The IDADeltaOwner interface determines whether a source has a Delta.

The TDADataStreamer class uses this interface internally in the methods WriteDelta, ReadDelta and WriteDataset.

  if not Supports(Source, IDADeltaOwner, deltaowner)
  then raise Exception.Create('Source does not have a delta')
  else delta := deltaowner.GetDelta;


Required Methods

GetDelta  safecall

Returns delta instance

function GetDelta: IDADelta

IsDeltaInitialized  safecall beta

Specified the state of Delta

function IsDeltaInitialized: Boolean