TBlobStream Class

TBlobStream is a stream object that provides services which allow applications to read from or write to field objects that represent Binary large object (BLOB) fields.

Class Hierarchy

Pascal

TBlobStream = class(TStream);

C++

class TBlobStream : public TStream;

File

DBTables

Description

Use TBlobStream to access or modify the value of a BLOB field in a BDE-enabled dataset. TBlob stream works with persistent TBlobField objects (including descendants of TBlobField such as TGraphicField and TMemoField). BLOB fields use BLOB streams to read data from and write data to the dataset.

TBlobStream allows objects that have no specialized knowledge of how data is stored in a BLOB field to read or write such data by employing the uniform stream mechanism.

To use a BLOB stream, create an instance of TBlobStream, use the methods of the stream to read or write the data, and then free the BLOB stream. Do not use the same instance of TBlobStream to access data from more than one record. Instead, create a new TBlobStream object every time you need to read or write BLOB data on a new record.