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capture onKeyDown

Posted on 2001-08-26
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Last Modified: 2010-04-06
How do i capture onKeyDown events that are triggered outside my program?
Say i wanted to make a program that beeps or something everytime a certain key is pressed in any other program i might be using.

Any help appreciated :)
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Question by:psogaa
3 Comments
 
LVL 9

Accepted Solution

by:
ITugay earned 100 total points
ID: 6426129
Hi psogaa,

here is it.

It show message if you press Ctrl+F8 or Alt+F12.

-----
Igor.

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
  public
    procedure WMHotKey(var Msg : TWMHotKey); message WM_HOTKEY;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

const
  AltF12_HotKey = 1110;
  CtrlF8_HotKey = 1111;

procedure TForm1.FormCreate(Sender: TObject);
begin
   RegisterHotKey(Handle,AltF12_HotKey,MOD_ALT,VK_F12);
   RegisterHotKey(Handle,CtrlF8_HotKey,MOD_CONTROL,VK_F8);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  UnregisterHotKey(Handle,AltF12_HotKey);
  UnregisterHotKey(Handle,CtrlF8_HotKey);
end;

procedure TForm1.WMHotKey(var Msg : TWMHotKey);
begin
  case MSG.HotKey of
  AltF12_HotKey:
    begin
      Application.BringToFront;
      ShowMessage('Alt-F12');
    end;
  CtrlF8_HotKey:
    begin
      Application.BringToFront;
      ShowMessage('Ctrl-F8');
    end;
  end;
end;


end.
0
 
LVL 22

Expert Comment

by:Mohammed Nasman
ID: 6426156
Hello

  This article will help you to do that

Hooks: Capture keys in all Windows applications  
http://www.q3.nu/trucomania/truco.cgi?408&ing

and this article to help you to understand the hook in windows

An introduction to hook procedures
http://delphi.about.com/library/bluc/text/uc063001a.htm

Best regards
Mohammed
0
 
LVL 2

Author Comment

by:psogaa
ID: 6426581
Thank you both, it works great :)
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