unit BlobFld;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, Buttons, DBTables, DB, ExtCtrls, DBCtrls,
  Grids, DBGrids;

type
  TFrmBlobFld = class(TForm)
    BtnWrite: TBitBtn;
    Table1: TTable;
    DataSource1: TDataSource;
    DBNavigator1: TDBNavigator;
    LbxDisplayBlob: TListBox;
    Table1pubid: TIntegerField;
    Table1comments: TMemoField;
    Table1UpdateTime: TTimeField;
    Table1Real1: TFloatField;
    Table1Real2: TFloatField;
    Table1Real3: TFloatField;
    Table1Curr1: TCurrencyField;
    Table1Blobs: TBlobField;
    Table1Bytes: TBytesField;
    CbxRead: TCheckBox;
    procedure BtnWriteClick(Sender: TObject);
    procedure DataSource1DataChange(Sender: TObject; Field: TField);
    procedure FormShow(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  FrmBlobFld: TFrmBlobFld;

implementation

{$R *.DFM}

type
  ADouble = array[1..12] of double;
  PADouble = ^ADouble;

procedure TFrmBlobFld.BtnWriteClick(Sender: TObject);
var
  i: integer;
  myBlob: TBlobStream;
  v: longint;
begin
  Table1.Edit;

  myBlob := TBlobStream.Create(Table1Blobs, bmReadWrite);
  try
    v := ComponentCount;
    myBlob.Write(v, sizeof(longint));

    for i := 0 to ComponentCount - 1 do
    begin
      v := Components[i].ComponentIndex;
      myBlob.Write(v, sizeof(longint));
    end;
  finally
    Table1.Post;
    myBlob.Free;
  end;
end;

procedure TFrmBlobFld.DataSource1DataChange(Sender: TObject; Field: TField);
var
  i: integer;
  myBlob: TBlobStream;
  t: longint;
  v: longint;
begin
  if CbxRead.Checked then
  begin
    LbxDisplayBlob.Clear;

    myBlob := TBlobStream.Create(Table1Blobs, bmRead);
    try
      myBlob.Read(t, sizeof(longint));
      LbxDisplayBlob.Items.Add(IntToStr(t));

      for i := 0 to t - 1 do
      begin
        myBlob.Read(v, sizeof(longint));
        LbxDisplayBlob.Items.Add(IntToStr(v));
      end;
    finally
      myBlob.Free;
    end;
  end;
end;

procedure TFrmBlobFld.FormShow(Sender: TObject);
begin
  Table1.Open;
end;

procedure TFrmBlobFld.FormClose(Sender: TObject;
  var Action: TCloseAction);
begin
  Table1.Close;
end;

end.