library Hk;
uses
Windows,
Messages,
SysUtils;
type
PHookRec = ^THookRec;
THookRec =
record
AppHnd: Integer;
end;
var
Hooked: Boolean;
hKeyHook, 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
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
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
{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(AppHandle: HWND): Byte;
export;
begin
Result := 0;
if Hooked
then
begin
Result := 1;
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);
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;
DLLProc := @EntryProc;
EntryProc(Dll_Process_Attach);
end.