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WispHooks.pas
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WispHooks.pas
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{
*****************************************************************************
* *
* Hooks *
* *
* By Jens Borrisholt *
* Jens@Borrisholt.com *
* *
* This file may be distributed and/or modified under the terms of the GNU *
* General Public License (GPL) version 2 as published by the Free Software *
* Foundation. *
* *
* This file has no warranty and is used at the users own peril *
* *
* Please report any bugs to Jens@Borrisholt.com or contact me if you want *
* to contribute to this unit. It will be deemed a breach of copyright if *
* you publish any source code (modified or not) herein under your own name *
* without the authors consent!!!!! *
* *
* CONTRIBUTIONS:- *
* Jens Borrisholt (Jens@Borrisholt.com) [ORIGINAL AUTHOR] *
* *
* Published: http://delphi.about.com/od/windowsshellapi/a/delphi-hooks.htm *
*****************************************************************************
}
unit WispHooks;
interface
uses
Windows, Classes;
const
WH_KEYBOARD_LL = 13;
WH_MOUSE_LL = 14;
(*
* Low level hook flags
*)
LLKHF_EXTENDED = $01;
LLKHF_INJECTED = $10;
LLKHF_ALTDOWN = $20;
LLKHF_UP = $80;
{$M+}
type
TKeyState = (ksKeyDown, ksKeyIsDown, ksDummy, ksKeyUp);
THookMsg = packed record
Code: Integer;
WParam: WPARAM;
LParam: LPARAM;
Result: LResult
end;
ULONG_PTR = ^DWORD;
pKBDLLHOOKSTRUCT = ^KBDLLHOOKSTRUCT;
KBDLLHOOKSTRUCT = packed record
vkCode: DWORD;
scanCodem: DWORD;
flags: DWORD;
time: DWORD;
dwExtraInfo: ULONG_PTR;
end;
pMSLLHOOKSTRUCT = ^MSLLHOOKSTRUCT;
MSLLHOOKSTRUCT = packed record
Pt: TPoint;
MouseData: DWORD;
Flags: DWORD;
Time: DWORD;
dwExtraInfo: ULONG_PTR;
end;
TCustomHook = class;
THook = class;
THookMethod = procedure(var HookMsg: THookMsg) of object;
THookNotify = procedure(Hook: THook; var Hookmsg: THookMsg) of object;
TCustomHook = class
private
FHook: hHook;
FHookProc: Pointer;
FOnPreExecute: THookNotify;
FOnPostExecute: THookNotify;
FActive: Boolean;
FLoadedActive: Boolean;
FThreadID: Integer;
procedure SetActive(NewState: Boolean);
procedure SetThreadID(NewID: Integer);
procedure HookProc(var HookMsg: THookMsg);
protected
procedure PreExecute(var HookMsg: THookMsg; var Handled: Boolean); virtual;
procedure PostExecute(var HookMsg: THookMsg); virtual;
function AllocateHook: hHook; virtual; abstract;
public
constructor Create;
destructor Destroy; override;
property ThreadID: Integer read FThreadID write SetThreadID stored False;
property Active: Boolean read FActive write SetActive;
property OnPreExecute: THookNotify read FOnPreExecute write FOnPreExecute;
property OnPostExecute: THookNotify read FOnPostExecute write FOnPostExecute;
end;
THook = class(TCustomHook)
published
property Active;
property OnPreExecute;
property OnPostExecute;
end;
TCallWndProcHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TCallWndProcRetHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TCBTHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TDebugHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TGetMessageHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TJournalPlaybackHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TJournalRecordHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TKeyboardHook = class(THook)
private
FKeyState: TKeyState;
protected
procedure PreExecute(var HookMsg: THookMsg; var Handled: Boolean); override;
procedure PostExecute(var HookMsg: THookMsg); override;
public
function AllocateHook: hHook; override;
published
property KeyState : TKeyState read FKeyState;
end;
TMouseHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TMsgHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TShellHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TSysMsgHook = class(THook)
public
function AllocateHook: hHook; override;
end;
TLowLevelKeyboardHook = class(THook)
private
FHookStruct: pKBDLLHOOKSTRUCT;
protected
procedure PreExecute(var HookMsg: THookMsg; var Handled: Boolean); override;
procedure PostExecute(var HookMsg: THookMsg); override;
public
function AllocateHook: hHook; override;
property HookStruct: pKBDLLHOOKSTRUCT read FHookStruct;
end;
TLowLevelMouseHook = class(THook)
private
FHookStruct: pMSLLHOOKSTRUCT;
protected
procedure PreExecute(var HookMsg: THookMsg; var Handled: Boolean); override;
procedure PostExecute(var HookMsg: THookMsg); override;
public
function AllocateHook: hHook; override;
property HookStruct: pMSLLHOOKSTRUCT read FHookStruct;
end;
function MakeHookInstance(Method: THookMethod): Pointer;
procedure FreeHookInstance(ObjectInstance: Pointer);
implementation
uses
SysUtils;
const
InstanceCount = 313; // set so that sizeof (TInstanceBlock) < PageSize
type
pObjectInstance = ^TObjectInstance;
TObjectInstance = packed record
Code: Byte;
Offset: Integer;
case Integer of
0: (Next: pObjectInstance);
1: (Method: THookMethod);
end;
pInstanceBlock = ^TInstanceBlock;
TInstanceBlock = packed record
Next: pInstanceBlock;
Code: array[1..2] of Byte;
WndProcPtr: Pointer;
Instances: array[0..InstanceCount] of TObjectInstance;
end;
var
InstBlockList: pInstanceBlock = nil;
InstFreeList: pObjectInstance = nil;
function StdHookProc(Code, WParam: WPARAM; LParam: LPARAM): LResult; stdcall; assembler;
asm
XOR EAX,EAX
PUSH EAX
PUSH LParam
PUSH WParam
PUSH Code
MOV EDX,ESP
MOV EAX,[ECX].Longint[4]
CALL [ECX].Pointer
ADD ESP,12
POP EAX
end;
{ Allocate a hook method instance }
function CalcJmpOffset(Src, Dest: Pointer): Longint;
begin
Result := Longint(Dest) - (Longint(Src) + 5);
end;
function MakeHookInstance(Method: THookMethod): Pointer;
const
BlockCode: array[1..2] of Byte = ($59, $E9);
PageSize = 4096;
var
Block: pInstanceBlock;
Instance: pObjectInstance;
begin
if InstFreeList = nil then
begin
Block := VirtualAlloc(nil, PageSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
Block^.Next := InstBlockList;
Move(BlockCode, Block^.Code, SizeOf(BlockCode));
Block^.WndProcPtr := Pointer(CalcJmpOffset(@Block^.Code[2], @StdHookProc));
Instance := @Block^.Instances;
repeat
Instance^.Code := $E8;
Instance^.Offset := CalcJmpOffset(Instance, @Block^.Code);
Instance^.Next := InstFreeList;
InstFreeList := Instance;
Inc(Longint(Instance), SizeOf(TObjectInstance));
until Longint(Instance) - Longint(Block) >= SizeOf(TInstanceBlock);
InstBlockList := Block
end;
Result := InstFreeList;
Instance := InstFreeList;
InstFreeList := Instance^.Next;
Instance^.Method := Method
end;
{ Free a hook method instance }
procedure FreeHookInstance(ObjectInstance: Pointer);
begin
if ObjectInstance = nil then
Exit;
pObjectInstance(ObjectInstance)^.Next := InstFreeList;
InstFreeList := ObjectInstance
end;
constructor TCustomHook.Create;
begin
inherited;
FHookProc := MakeHookInstance(HookProc);
FActive := False;
FLoadedActive := False;
FHook := 0;
ThreadID := GetCurrentThreadID;
end;
destructor TCustomHook.Destroy;
begin
Active := False;
FreeHookInstance(FHookProc);
inherited;
end;
procedure TCustomHook.SetActive(NewState: Boolean);
begin
if FActive = NewState then
Exit;
FActive := NewState;
case Active of
True:
begin
FHook := AllocateHook;
if (FHook = 0) then
begin
FActive := False;
raise Exception.Create(Classname + ' CREATION FAILED!');
end;
end;
False:
begin
if (FHook <> 0) then
UnhookWindowsHookEx(FHook);
FHook := 0;
end;
end;
end;
procedure TCustomHook.SetThreadID(NewID: Integer);
var
IsActive: Boolean;
begin
IsActive := FActive;
Active := False;
FThreadID := NewID;
Active := IsActive;
end;
procedure TCustomHook.HookProc(var HookMsg: THookMsg);
var
Handled: Boolean;
begin
Handled := False;
PreExecute(HookMsg, Handled);
if not Handled then
begin
with HookMsg do
Result := CallNextHookEx(FHook, Code, wParam, lParam);
PostExecute(HookMsg);
end;
end;
procedure TCustomHook.PreExecute(var HookMsg: THookMsg; var Handled: Boolean);
begin
if Assigned(FOnPreExecute) then
FOnPreExecute(THook(Self), HookMsg);
Handled := HookMsg.Result <> 0;
end;
procedure TCustomHook.PostExecute(var HookMsg: THookMsg);
begin
if Assigned(FOnPostExecute) then
FOnPostExecute(THook(Self), HookMsg);
end;
function TCallWndProcHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_CALLWNDPROC, FHookProc, HInstance, ThreadID);
end;
function TCallWndProcRetHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_CALLWNDPROCRET, FHookProc, hInstance, ThreadID);
end;
function TCBTHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_CBT, FHookProc, hInstance, ThreadID);
end;
function TDebugHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_DEBUG, FHookProc, hInstance, ThreadID);
end;
function TGetMessageHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_GETMESSAGE, FHookProc, hInstance, ThreadID);
end;
function TJournalPlaybackHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_JOURNALPLAYBACK, FHookProc, hInstance, ThreadID);
end;
function TJournalRecordHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_JOURNALRECORD, FHookProc, hInstance, ThreadID);
end;
function TKeyboardHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_KEYBOARD, FHookProc, hInstance, ThreadID);
end;
function TMouseHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_MOUSE, FHookProc, hInstance, ThreadID);
end;
function TMsgHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_MSGFILTER, FHookProc, hInstance, ThreadID);
end;
function TShellHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_SHELL, FHookProc, hInstance, ThreadID);
end;
function TSysMsgHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_SYSMSGFILTER, FHookProc, hInstance, ThreadID);
end;
function TLowLevelKeyboardHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_KEYBOARD_LL, FHookProc, hInstance, 0);
end;
procedure TLowLevelKeyboardHook.PostExecute(var HookMsg: THookMsg);
begin
inherited;
FHookStruct := nil;
end;
procedure TLowLevelKeyboardHook.PreExecute(var HookMsg: THookMsg; var Handled: Boolean);
begin
FHookStruct := pKBDLLHOOKSTRUCT(Hookmsg.LPARAM);
inherited;
end;
{ TLowLevelMouseHook }
function TLowLevelMouseHook.AllocateHook: hHook;
begin
Result := SetWindowsHookEx(WH_MOUSE_LL, FHookProc, hInstance, 0);
end;
procedure TLowLevelMouseHook.PostExecute(var HookMsg: THookMsg);
begin
inherited;
FHookStruct := nil;
end;
procedure TLowLevelMouseHook.PreExecute(var HookMsg: THookMsg; var Handled: Boolean);
begin
FHookStruct := pMSLLHOOKSTRUCT(Hookmsg.LPARAM);
inherited;
end;
procedure TKeyboardHook.PostExecute(var HookMsg: THookMsg);
begin
inherited;
FKeyState := ksDummy;
end;
procedure TKeyboardHook.PreExecute(var HookMsg: THookMsg; var Handled: Boolean);
begin
FKeyState := TKeyState(Hookmsg.lParam shr 30);
inherited;
end;
end.