Arsip: Contoh Unit Untuk Block Keyboard Keys,.,.,.,.

unit UBlockKeys;
interface
uses
Windows, Messages, SysUtils,  Classes;
type
tagKBDLLHOOKSTRUCT = packed record
vkCode: DWORD;
scanCode: DWORD;
flags: DWORD;
time: DWORD;
dwExtraInfo: DWORD;
end;
KBDLLHOOKSTRUCT = tagKBDLLHOOKSTRUCT;
PKBDLLHOOKSTRUCT = ^KBDLLHOOKSTRUCT;
const
WH_KEYBOARD_LL = 13;
LLKHF_ALTDOWN = $20;
function LowLevelKeyboardProc(nCode: Integer;WParam: WPARAM;
LParam: LPARAM):LRESULT; stdcall;
procedure BlockKeys;
procedure UnBlockKeys;
var
hhkLowLevelKybd: HHOOK;
implementation
function LowLevelKeyboardProc(nCode: Integer; WParam: WPARAM;
LParam: LPARAM):LRESULT; stdcall;
var
fEatKeystroke: BOOL;
p: PKBDLLHOOKSTRUCT;
begin
Result := 0;
fEatKeystroke := FALSE;
p := PKBDLLHOOKSTRUCT (lParam);
if (nCode = HC_ACTION) then
begin
case wParam of
WM_KEYDOWN,
WM_SYSKEYDOWN,
WM_KEYUP,
WM_SYSKEYUP:
fEatKeystroke :=
((p.vkCode = VK_TAB) and ((p.flags and LLKHF_ALTDOWN) <> 0)) or // ALT+TAB
    ((p.vkCode = VK_ESCAPE) and ((p.flags and LLKHF_ALTDOWN) <> 0))or //ALT+ESC
    ((p.vkCode = VK_ESCAPE) and ((GetKeyState(VK_CONTROL) and $8000) <> 0))  or //CTRL+ESC
    ((p.vkCode = VK_F4) and ((p.flags and LLKHF_ALTDOWN) <> 0)) or //ALT+F4
    ((p.vkCode = VK_SPACE) and ((p.flags and LLKHF_ALTDOWN) <> 0)); //ALT+SPACE
  end;
end;
if fEatKeystroke = True then
Result := 1;
if nCode <> 0 then
Result := CallNextHookEx(0, nCode, wParam, lParam);
end;
procedure BlockKeys;
begin
if hhkLowLevelKybd = 0 then
begin
hhkLowLevelKybd := SetWindowsHookExW(WH_KEYBOARD_LL,
LowLevelKeyboardProc,
Hinstance,
0);
if hhkLowLevelKybd <> 0 then
else
end
else
end;
procedure UnBlockKeys;
begin
if hhkLowLevelKybd <> 0 then
if UnhookWindowsHookEx(hhkLowLevelKybd) <> False then
hhkLowLevelKybd := 0;
end;
end.