CaptureAllScreenToBMP - Delphi in Delphi

//captura a tela toda e salva em arquivo formato BMP
//CaptureAllScreenToBMP - Delphi

procedure CaptureAllScreenToBMP(AFileName: string);
const
  CAPTUREBLT = $40000000;
var
  hdcScreen: HDC;
  hdcCompatible: HDC;
  bmp: TBitmap;
  hbmScreen: HBITMAP;
begin
  // Create a normal DC and a memory DC for the entire screen. The
  // normal DC provides a "snapshot" of the screen contents. The
  // memory DC keeps a copy of this "snapshot" in the associated
  // bitmap.

  hdcScreen := CreateDC('DISPLAY', nil, nil, nil);
  hdcCompatible := CreateCompatibleDC(hdcScreen);
  // Create a compatible bitmap for hdcScreen.

  hbmScreen := CreateCompatibleBitmap(hdcScreen,
    GetDeviceCaps(hdcScreen, HORZRES),
    GetDeviceCaps(hdcScreen, VERTRES));

  // Select the bitmaps into the compatible DC.
  SelectObject(hdcCompatible, hbmScreen);
  bmp := TBitmap.Create;
  bmp.Handle := hbmScreen;
  BitBlt(hdcCompatible,
    0, 0,
    bmp.Width, bmp.Height,
    hdcScreen,
    0, 0,
    SRCCOPY or CAPTUREBLT);

  bmp.SaveToFile(AFileName);
  bmp.Free;
  DeleteDC(hdcScreen);
  DeleteDC(hdcCompatible);
end;