Установка ловушки для клавиатуры

// 1. Library Code for a Key Hook DLL 


library
 HookLib;

 uses

   madExcept,
   Windows,
   Messages,
   SysUtils;

 type

   PHookRec = ^THookRec;
   THookRec = record

     AppHnd: Integer;
     MemoHnd: Integer;
   end
;

 var

   Hooked: Boolean;
   hKeyHook, hMemo, hMemFile, hApp: HWND;
   PHookRec1: PHookRec;

 function
 KeyHookFunc(Code, VirtualKey, KeyStroke: Integer): LRESULT; stdcall
;
 var

   KeyState1: TKeyBoardState;
   AryChar: array
[0..1] of
 Char;
   Count: Integer;
 begin

   Result := 0;
   if
 Code = HC_NOREMOVE then
 Exit;
   Result := CallNextHookEx(hKeyHook, Code, VirtualKey, KeyStroke);
   {I moved the CallNextHookEx up here but if you want to block 
   or change any keys then move it back down}
   if
 Code < 0 then

     Exit;

   if
 Code = HC_ACTION then

   begin

     if
 ((KeyStroke and
 (1 shl
 30)) <> 0) then

       if
 not
 IsWindow(hMemo) then

       begin

        {I moved the OpenFileMapping up here so it would not be opened 
        unless the app the DLL is attatched to gets some Key messages}
         hMemFile  := OpenFileMapping(FILE_MAP_WRITE, False, 'Global7v9k');
         PHookRec1 := MapViewOfFile(hMemFile, FILE_MAP_WRITE, 0, 0, 0);
         if
 PHookRec1 <> nil
 then

         begin

           hMemo := PHookRec1.MemoHnd;
           hApp  := PHookRec1.AppHnd;
         end
;
       end
;
     if
 ((KeyStroke and
 (1 shl
 30)) <> 0) then

     begin

       GetKeyboardState(KeyState1);
       Count := ToAscii(VirtualKey, KeyStroke, KeyState1, AryChar, 0);
       if
 Count = 1 then

       begin

         SendMessage(hMemo, WM_CHAR, Ord(AryChar[0]), 0);
         {I included 2 ways to get the Charaters, a Memo Hnadle and 
         a WM_USER+1678 message to the program}
         PostMessage(hApp, WM_USER + 1678, Ord(AryChar[0]), 0);
       end
;
     end
;
   end
;
 end
;


 function
 StartHook(MemoHandle, AppHandle: HWND): Byte; export;
 begin

   Result := 0;
   if
 Hooked then

   begin

     Result := 1;
     Exit;
   end
;
   if
 not
 IsWindow(MemoHandle) then

   begin

     Result := 4;
     Exit;
   end
;
   hKeyHook := SetWindowsHookEx(WH_KEYBOARD, KeyHookFunc, hInstance, 0);
   if
 hKeyHook > 0 then

   begin

     {you need to use a mapped file because this DLL attatches to every app 
     that gets windows messages when it's hooked, and you can't get info except 
     through a Globally avaiable Mapped file}
     hMemFile := CreateFileMapping($FFFFFFFF, // $FFFFFFFF gets a page memory file 
      nil
,                // no security attributes 
      PAGE_READWRITE,     // read/write access 
      0,                  // size: high 32-bits 
      SizeOf(THookRec),   // size: low 32-bits 
      //SizeOf(Integer), 
      'Global7v9k');    // name of map object 
    PHookRec1 := MapViewOfFile(hMemFile, FILE_MAP_WRITE, 0, 0, 0);
     hMemo := MemoHandle;
     PHookRec1.MemoHnd := MemoHandle;
     hApp := AppHandle;
     PHookRec1.AppHnd := AppHandle;
     {set the Memo and App handles to the mapped file}
     Hooked := True;
   end

   else

     Result := 2;
 end
;

 function
 StopHook: Boolean; export;
 begin

   if
 PHookRec1 <> nil
 then

   begin

     UnmapViewOfFile(PHookRec1);
     CloseHandle(hMemFile);
     PHookRec1 := nil
;
   end
;
   if
 Hooked then

     Result := UnhookWindowsHookEx(hKeyHook)
   else

     Result := True;
   Hooked := False;
 end
;

 procedure
 EntryProc(dwReason: DWORD);
 begin

   if
 (dwReason = Dll_Process_Detach) then

   begin

     if
 PHookRec1 <> nil
 then

     begin

       UnmapViewOfFile(PHookRec1);
       CloseHandle(hMemFile);
     end
;
     UnhookWindowsHookEx(hKeyHook);
   end
;
 end
;

 exports

   StartHook,
   StopHook;

 begin

   PHookRec1 := nil
;
   Hooked := False;
   hKeyHook := 0;
   hMemo := 0;
   DLLProc := @EntryProc;
   EntryProc(Dll_Process_Attach);
 end
.


 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++

 2. Code from the calling Program

 {this program get's the Char from the DLL in 2 ways, 
  as
 a Char message
 to
 a Memo and
 as
 a DLLMessage WM_USER+1678}
 ---


 unit
 Unit1;

 interface


 uses

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

 type

   TForm1 = class
(TForm)
     but_StartHook: TButton;
     but_StopHook: TButton;
     label1: TLabel;
     Memo1: TMemo;
     procedure
 but_StartHookClick(Sender: TObject);
     procedure
 but_StopHookClick(Sender: TObject);
   private

     { Private declarations }
     hLib2: THandle;
     DllStr1: string
;
     procedure
 DllMessage(var
 Msg: TMessage); message
 WM_USER + 1678;
   public

     { Public declarations }
   end
;

 var

   Form1: TForm1;

 implementation


 {$R *.dfm}

 procedure
 TForm1.DllMessage(var
 Msg: TMessage);
 begin

   if
 (Msg.wParam = 8) or
 (Msg.wParam = 13) then
 Exit;
   {the 8 is the Backspace and the 13 if the Enter key, You'll need to 
  do some special handleing for a string}
   DllStr1 := DllStr1 + Chr(Msg.wParam);
   label1.Caption := DllStr1;
 end
;

 procedure
 TForm1.but_StartHookClick(Sender: TObject);
 type

   TStartHook = function
(MemoHandle, AppHandle: HWND): Byte;
 var

   StartHook1: TStartHook;
   SHresult: Byte;
 begin

   hLib2 := LoadLibrary('HookLib.dll');
   @StartHook1 := GetProcAddress(hLib2, 'StartHook');
   if
 @StartHook1 = nil
 then
 Exit;
   SHresult := StartHook1(Memo1.Handle, Handle);
   if
 SHresult = 0 then
 ShowMessage('the Key Hook was Started, good');
   if
 SHresult = 1 then
 ShowMessage('the Key Hook was already Started');
   if
 SHresult = 2 then
 ShowMessage('the Key Hook can NOT be Started, bad');
   if
 SHresult = 4 then
 ShowMessage('MemoHandle is incorrect');
 end
;

 procedure
 TForm1.but_StopHookClick(Sender: TObject);
 type

   TStopHook = function
: Boolean;
 var

   StopHook1: TStopHook;
   hLib21: THandle;
 begin

   @StopHook1 := GetProcAddress(hLib2, 'StopHook');
   if
 @StopHook1 = nil
 then

   begin

     ShowMessage('Stop Hook DLL Mem Addy not found');
     Exit;
   end
;
   if
 StopHook1 then

     ShowMessage('Hook was stoped');
   FreeLibrary(hLib2);
   {for some reason in Win XP you need to call FreeLibrary twice 
  maybe because you get 2 functions from the DLL? ?}
   FreeLibrary(hLib2);
 end
;


 end
.

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