Classes::TStream* __fastcall CreateBlobStream(Db::TField* Field,
      Db::TBlobStreamMode Mode)

Usage

Call the CreateBlobStream method to obtain a stream for reading data from or writing data to a BLOB field. The Field parameter must specify a TBlobField component from the Fields property. The Mode parameter specifies whether the stream will be used for reading, writing, or updating the contents of the field.