Sub MFDataGetByIndex( _
   ByVal _nIndex As Integer, _
   ByRef _pbsDataID As String, _
   ByRef _pcbANCData As Integer, _
   ByRef _ppbANCData As Long _
) 

void MFDataGetByIndex( 
   int _nIndex,
   out string _pbsDataID,
   out int _pcbANCData,
   out long _ppbANCData
)

procedure MFDataGetByIndex( 
    _nIndex: Integer;
   Out  _pbsDataID: String;
   Out  _pcbANCData: Integer;
   Out  _ppbANCData: Int64
); 

void MFDataGetByIndex( 
   int _nIndex,
   [PARAMFLAG::Out] BSTR* _pbsDataID,
   [PARAMFLAG::Out] int _pcbANCData,
   [PARAMFLAG::Out] long _ppbANCData
) 

Parameters

_nIndex

index of ancillary data

_pbsDataID

data ID

_pcbANCData

ancillary data's size

_ppbANCData

ancillary data's pointer

Reference

IMFFrame Interface
IMFFrame Members