Регистрируем горячие клавиши

Code:

{

The following example demonstrates registering hotkeys with the

system to globally trap keys.

Das Folgende Beispiel zeigt, wie man Hotkeys registrieren und

darauf reagieren kann, wenn sie gedruckt werden. (systemweit)

}

unit Unit1;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,

  Dialogs;

type

  TForm1 = class(TForm)

    procedure FormCreate(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

  private

    { Private declarations }

    id1, id2, id3, id4: Integer;

    procedure WMHotKey(var Msg: TWMHotKey); message WM_HOTKEY;

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

// Trap Hotkey Messages

procedure TForm1.WMHotKey(var Msg: TWMHotKey);

begin

  if Msg.HotKey = id1 then

    ShowMessage('Ctrl + A pressed !');

  if Msg.HotKey = id2 then

    ShowMessage('Ctrl + Alt + R pressed !');

  if Msg.HotKey = id3 then

    ShowMessage('Win + F4 pressed !');

  if Msg.HotKey = id4 then

    ShowMessage('Print Screen pressed !');

end;

procedure TForm1.FormCreate(Sender: TObject);

  // Different Constants from Windows.pas

const

  MOD_ALT = 1;

  MOD_CONTROL = 2;

  MOD_SHIFT = 4;

  MOD_WIN = 8;

  VK_A = $41;

  VK_R = $52;

  VK_F4 = $73;

begin

  // Register Hotkey Ctrl + A

id1 := GlobalAddAtom('Hotkey1');

  RegisterHotKey(Handle, id1, MOD_CONTROL, VK_A);

  // Register Hotkey Ctrl + Alt + R

id2 := GlobalAddAtom('Hotkey2');

  RegisterHotKey(Handle, id2, MOD_CONTROL + MOD_Alt, VK_R);

  // Register Hotkey Win + F4

id3 := GlobalAddAtom('Hotkey3');

  RegisterHotKey(Handle, id3, MOD_WIN, VK_F4);

  // Globally trap the Windows system key "PrintScreen"

id4 := GlobalAddAtom('Hotkey4');

  RegisterHotKey(Handle, id4, 0, VK_SNAPSHOT);

end;

// Unregister the Hotkeys

procedure TForm1.FormDestroy(Sender: TObject);

begin

  UnRegisterHotKey(Handle, id1);

  GlobalDeleteAtom(id1);

  UnRegisterHotKey(Handle, id2);

  GlobalDeleteAtom(id2);

  UnRegisterHotKey(Handle, id3);

  GlobalDeleteAtom(id3);

  UnRegisterHotKey(Handle, id4);

  GlobalDeleteAtom(id4);

end;

end.

{

RegisterHotKey fails if the keystrokes specified for the hot key have

already been registered by another hot key.

Windows NT4 and Windows 2000/XP: The F12 key is reserved for use by the

debugger at all times, so it should not be registered as a hot key. Even

when you are not debugging an application, F12 is reserved in case a

kernel-mode debugger or a just-in-time debugger is resident.

}