Регистрация горячих системных клавиш

{ 
  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. 
}

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