Listing 4. The InitObjects Method

procedure TSpeedDraw.InitObjects;
var
  hr: hResult;
  Flags: DWORD;
begin
  FHandle := TForm(Owner).Handle;
  ASpeedDraw := Self;

  DDTest(DirectDrawCreate(nil, FDirectDraw, nil), 'InitObjects1');

  if not FUseExclusive then
    Flags := DDSCL_NORMAL
  else
    Flags := DDSCL_EXCLUSIVE or DDSCL_FULLSCREEN;
  DDTest(FDirectDraw.SetCooperativeLevel(FHandle, Flags), 'InitObjects2');
  if FUseExclusive then begin
    hr := FDirectDraw.SetDisplayMode(640, 480, 8);
    if(hr <> DD_OK) then
      raise EDDError.CreateFmt('TSpeedDraw.InitObjects: %d %s', [hr, GetOleError(hr)]);
  end;
  
  CreatePrimary;
  SetUpBack;
  SetUpWorkSurface;

  if FUseTimer then
    SetTimer(Handle, Timer1, FTimerInterval, @Timer2Timer);
  if Assigned(InitObjectsProc) then
    InitObjectsProc(Self);

  FActive := True;
end;