Proxymis Multimedia BLOG

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
private
    { Private declarations }
    id1, id2, id3, id4: Integer;
    procedure WMHotKey(var Msg: TWMHotKey); message WM_HOTKEY;

  public
    { Déclarations publiques }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
procedure TForm1.WMHotKey(var Msg: TWMHotKey);
begin

  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

  // Globally trap the Windows system key “PrintScreen”
  id4 := GlobalAddAtom(’Hotkey4′);
  RegisterHotKey(Handle, id4, 0, VK_SNAPSHOT);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin

  UnRegisterHotKey(Handle, id4);
  GlobalDeleteAtom(id4);
end;

end.