hook键盘钩子 带dll

library Key;
uses
  SysUtils,
  Classes,
  HookKey_Unit in 'HookKey_Unit.pas';

{$R *.res}

exports
    HookOn,HookOff;
begin

end.

unit HookKey_Unit;

interface
 uses windows,messages;//Dialogs;
const
  WM_HOOKKEY = WM_USER + $;
  procedure HookOn; stdcall;
  procedure HookOff;  stdcall;
implementation
var
  HookDeTeclado     : HHook;
  FileMapHandle     : THandle;
  PViewInteger      : ^Integer;

function CallBackDelHook( Code    : Integer;
                          wParam  : WPARAM;
                          lParam  : LPARAM
                          )       : LRESULT; stdcall;

begin
   if code=HC_ACTION then
   begin
    FileMapHandle:=OpenFileMapping(FILE_MAP_READ,False,'TestHook');
    if FileMapHandle<> then
    begin
      PViewInteger:=MapViewOfFile(FileMapHandle,FILE_MAP_READ,,,);
      PostMessage(PViewInteger^,WM_HOOKKEY,wParam,lParam);
      //ShowMessage('a');
      UnmapViewOfFile(PViewInteger);
      CloseHandle(FileMapHandle);
    end;
  end;
  Result := CallNextHookEx(HookDeTeclado, Code, wParam, lParam);
  //ShowMessage('b');
end;

procedure HookOn; stdcall;
begin
  HookDeTeclado:=SetWindowsHookEx(WH_KEYBOARD, CallBackDelHook, HInstance , );
end;

procedure HookOff;  stdcall;
begin
  UnhookWindowsHookEx(HookDeTeclado);
end;

end.

unit TestHookKey_Unit;
// download by http://www.codefans.net
interface
// download by http://www.codefans.net
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

const
  WM_HOOKKEY= WM_USER + $;
  HookDLL       = 'Key.dll';
type
  THookProcedure=procedure; stdcall;
  TForm1 = class(TForm)
    mmo1: TMemo;
    //Memo1: TMemo;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
    FileMapHandle  : THandle;
    PMem     : ^Integer;
    HandleDLL      : THandle;
    HookOn,
    HookOff        : THookProcedure;
    procedure HookKey(var message: TMessage); message  WM_HOOKKEY;

  public
    { Public declarations }
  end;
var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  mmo1.ReadOnly:=TRUE;
  mmo1.Clear;
  HandleDLL:=LoadLibrary( PChar(ExtractFilePath(Application.Exename)+
                                HookDll) );
  if HandleDLL =  then raise Exception.Create('未发现键盘钩子DLL');
  @HookOn :=GetProcAddress(HandleDLL, 'HookOn');
  @HookOff:=GetProcAddress(HandleDLL, 'HookOff');
  IF not assigned(HookOn) or
     not assigned(HookOff)  then
     raise Exception.Create('在给定的 DLL中'+#+
                            '未发现所需的函数');

  FileMapHandle:=CreateFileMapping( $FFFFFFFF,
                              nil,
                              PAGE_READWRITE,
                              ,
                              SizeOf(Integer),
                              'TestHook');

   if FileMapHandle= then
     raise Exception.Create( '创建内存映射文件时出错');
   PMem:=MapViewOfFile(FileMapHandle,FILE_MAP_WRITE,,,);
   PMem^:=Handle;
   HookOn;
end;
procedure TForm1.HookKey(var message: TMessage);
var
   KeyName : array[..] of char;
   Accion      : string;
begin
  GetKeyNameText(Message.LParam,@KeyName,);
  if ((Message.lParam shr ) and )=
      then Accion:='Key Up'
  else
  if ((Message.lParam shr ) and )=
      then Accion:='ReKeyDown'
      else Accion:='KeyDown';
  mmo1.Lines.add( Accion+
                      ': '+
                      String(KeyName)) ;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
 if Assigned(HookOff) then
     HookOff;
 if HandleDLL<> then
  FreeLibrary(HandleDLL);
  if FileMapHandle<> then
  begin
    UnmapViewOfFile(PMem);
    CloseHandle(FileMapHandle);
  end;

end;

end.