Få delphi til at ændre opløsning

http://delphi.about.com/library/weekly/aa011100a.htm

function ChangeResolution(XResolution, YResolution, Depth: DWORD): BOOL;
var
  DevMode: TDeviceMode;
  i: integer;
begin
  Result := False;
  i := 0;
  while EnumDisplaySettings(nil, i, DevMode) do
    with DevMode do
    begin
      if (dmPelsWidth = XResolution) and
        (dmPelsHeight = YResolution) and
        (dmBitsPerPel = Depth) then
        if ChangeDisplaySettings(DevMode, CDS_UPDATEREGISTRY) =
          DISP_CHANGE_SUCCESSFUL then
        begin
          Result := True;
          SendMessage(HWND_BROADCAST, WM_DISPLAYCHANGE, SPI_SETNONCLIENTMETRICS,
            0);
          Break;
        end;
      Inc(i);
    end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin  //for eksempel
ChangeResolution(800, 600, 32); //24 = 32 bit fargedybde
end;

Tak, eht!

Det skulle have været et svar