[serhasae]

Código Delphi [-]
function SetScreenResolution(Ancho, Altura: integer): Longint;
var
 DeviceMode: TDeviceMode;
begin
 with DeviceMode do begin
   dmSize := SizeOf(TDeviceMode);
   dmPelsWidth := Ancho;
   dmPelsHeight := Altura;
   dmFields := DM_PELSWIDTH or DM_PELSHEIGHT;
 end;
 Result := ChangeDisplaySettings(DeviceMode, CDS_UPDATEREGISTRY);
end;

procedure cambiar_resolucion(ancho,alto:integer);
begin
 SetScreenResolution(ancho, alto);
end;