delphi 窗体添加背景图片

var
  Bmp: TBitmap;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Bmp := TBitmap.Create;
  Bmp.LoadFromFile('D:\test.bmp');
  Brush.Bitmap := Bmp;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Bmp.Free;
end;