Properties · Methods · Events · Demos

Declaration

TIEDBMultiBitmap = class(TIECustomMultiBitmap);

Description

TIEDBMultiBitmap is a descendant of TIECustomMultiBitmap, but unlike TIEMultiBitmap it links to a datasource to provide access to images stored in a database table.
Generally a TIEDBMultiBitmap is attached to a TImageEnMView to make it DB aware.

TIEDBMultiBitmap supports both images stored within the database as a blob (by setting ImageBlobField) or images stored locally and referenced by a filename field (by setting only FilenameField). You will also need to set DataSource.

TIEDBMultiBitmap can operate in two modes:
◼Showing all images in a table (the multi-bitmap will contain one image per table record)
◼Showing an image with one or more frames at the current database position (the multi-bitmap will show the image for one database record, which may have multiple frames, e.g. a TIFF)

You can also use TIEDBMultiBitmap to retrieve an image (optionally with multiple frames, like a TIFF) embedded in a database blob field using the data-aware overload of Read.

// Extract an image from a database and save it
MyMBMP := TIEDBMultiBitmap.Create();
MyMBMP.Read( MyTableImageBlob );
MyMBmp.Write( 'D:\MyBlobImage.TIFF' );
MyMBmp.Free;

Demos

Example

// Create DB Aware TImageEnMView
procedure TMainForm.FormCreate(Sender: TObject);
begin
  ... Open a database table ...

  fDBMBitmap := TIEDBMultiBitmap.create( DataSource1, 'Image', 'Name' );
  ImageEnMView1.SetExternalMBitmap( fDBMBitmap );
end;

procedure TMainForm.FormDestroy(Sender: TObject);
begin
  FreeAndNil( fDBMBitmap );
end;

Methods and Properties

General

Database - General

Database - All Records Mode

Database - Single Record (Frames) Mode

Database Editing

Image Access

Image Information

Input/Output

Input/Output Parameters (Meta-Data)

Image Editing

Events

 Unique functionality to TIEDBMultiBitmap

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