Сохранение массива c изображениями

procedure TMainForm.SaveBoard;
var
  MemoryStream: TMemoryStream;
  FileStream: TFileStream;
  Writer: TWriter;
  Buffer: Pointer;
  Size: Longint;
  Column: Integer;
  Row: Integer;
begin
  MemoryStream := TMemoryStream.Create;
  FileStream := TFileStream.Create(SaveFilename, fmCreate);
  Writer := TWriter.Create(FileStream, $1000);
  try
    for Column := 0 to 4 do
      for Row := 0 to 4 do
      begin
        MemoryStream.Clear;
        Bitmaps[Column, Row].SaveToStream(MemoryStream);
        Buffer := MemoryStream.Memory;
        Size := MemoryStream.Size;
        Writer.WriteInteger(Size);
        Writer.Write(Buffer^, Size);
      end;
  finally
    Writer.Free;
    FileStream.Free;
    MemoryStream.Free;
  end;
end;

procedure TMainForm.Open1Click(Sender: TObject);
var
  MemoryStream: TMemoryStream;
  FileStream: TFileStream;
  Buffer: Pointer;
  Reader: TReader;
  Column: Integer;
  Row: Integer;
  Size: Longint;
begin
  OpenDialog2.Filename := SaveFilename;
  if not OpenDialog2.Execute then
    Exit;
  MemoryStream := TMemoryStream.Create;
  FileStream := TFileStream.Create(OpenDialog2.Filename, fmOpenRead);
  Reader := TReader.Create(FileStream, $1000);
  try
    for Column := 0 to 4 do
      for Row := 0 to 4 do
      begin
        Size := Reader.ReadInteger;
        MemoryStream.SetSize(Size);
        Buffer := MemoryStream.Memory;
        Reader.Read(Buffer^, Size);
        Bitmaps[Column, Row].LoadFromStream(MemoryStream);
      end;
  finally
    Reader.Free;
    FileStream.Free;
    MemoryStream.Free;
  end;
  DrawGrid1.Repaint;
  SaveFilename := OpenDialog2.Filename;
  Caption := 'Bingo-создатель - ' + ExtractFilename(SaveFilename);
end;