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Crear un punto de restauración del sistema - Delphi
Lenguaje de programación Borland Delphi



Abajo mostramos el código fuente para crear un punto de restauración del sistema en Windows XP. Para ello necesitaremos un formulario y un botón:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

const
 // Type of Event
 BEGIN_SYSTEM_CHANGE = 100;
 END_SYSTEM_CHANGE  = 101;
 // Type of Restore Points
 APPLICATION_INSTALL =  0;
 CANCELLED_OPERATION = 13;
 MAX_DESC = 64;
 MIN_EVENT = 100;

// Restore point information
type
PRESTOREPTINFOA = ^_RESTOREPTINFOA;
_RESTOREPTINFOA = packed record
    dwEventType: DWORD;  // Type of Event - Begin or End
    dwRestorePtType: DWORD;  // Type of Restore Point - App install/uninstall
    llSequenceNumber: INT64;  // Sequence Number - 0 for begin
    szDescription: array [0..MAX_DESC] of CHAR; // Description - Name of Application / Operation
end;
RESTOREPOINTINFO = _RESTOREPTINFOA;
PRESTOREPOINTINFOA = ^_RESTOREPTINFOA;

// Status returned by System Restore

PSMGRSTATUS = ^_SMGRSTATUS;
_SMGRSTATUS = packed record
    nStatus: DWORD; // Status returned by State Manager Process
    llSequenceNumber: INT64;  // Sequence Number for the restore point
end;
STATEMGRSTATUS =  _SMGRSTATUS;
PSTATEMGRSTATUS =  ^_SMGRSTATUS;

function SRSetRestorePointA(pRestorePtSpec: PRESTOREPOINTINFOA; pSMgrStatus: PSTATEMGRSTATUS): Bool;
  stdcall; external 'SrClient.dll' Name 'SRSetRestorePointA';


implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
  const
 CR = #13#10;
var
  RestorePtSpec: RESTOREPOINTINFO;
  SMgrStatus: STATEMGRSTATUS;
begin
  // Initialize the RESTOREPOINTINFO structure
  RestorePtSpec.dwEventType := BEGIN_SYSTEM_CHANGE;
  RestorePtSpec.dwRestorePtType := APPLICATION_INSTALL;
  RestorePtSpec.llSequenceNumber := 0;
  RestorePtSpec.szDescription := 'Ejemplo de Punto de restauración del sistema';

  if (SRSetRestorePointA(@RestorePtSpec, @SMgrStatus)) then
  begin
    ShowMessage('Punto de restauración creado con éxito. Datos:' + CR+
      'Número de secuencia: ' + Format('%d', [SMgrStatus.llSequenceNumber]) + CR+
      'Estado: ' + Format('%u', [SMgrStatus.nStatus]));

      // Restore Point Spec to cancel the previous restore point.
      RestorePtSpec.dwEventType := END_SYSTEM_CHANGE;
      RestorePtSpec.dwRestorePtType  := CANCELLED_OPERATION;
      RestorePtSpec.llSequenceNumber := SMgrStatus.llSequenceNumber;
    end
    else
      ShowMessage('No se ha podido crear un punto de restauración del sistema.');
  end;

end.




Publicado el: 2003-12-19

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