dhewm3/neo/sys/win32/win_taskkeyhook.cpp

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/*
===========================================================================
Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").
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Doom 3 Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Doom 3 Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
===========================================================================
*/
#include "../../idlib/precompiled.h"
#pragma hdrstop
//
// This file implements the low-level keyboard hook that traps the task keys.
//
//#define _WIN32_WINNT 0x0500 // for KBDLLHOOKSTRUCT
#include <windows.h>
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#include "win_local.h"
#define DLLEXPORT __declspec(dllexport)
// Magic registry key/value for "Remove Task Manager" policy.
LPCTSTR KEY_DisableTaskMgr = "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System";
LPCTSTR VAL_DisableTaskMgr = "DisableTaskMgr";
// The section is SHARED among all instances of this DLL.
// A low-level keyboard hook is always a system-wide hook.
#pragma data_seg (".mydata")
HHOOK g_hHookKbdLL = NULL; // hook handle
BOOL g_bBeep = FALSE; // beep on illegal key
#pragma data_seg ()
#pragma comment(linker, "/SECTION:.mydata,RWS") // tell linker: make it shared
/*
================
MyTaskKeyHookLL
Low-level keyboard hook:
Trap task-switching keys by returning without passing along.
================
*/
LRESULT CALLBACK MyTaskKeyHookLL( int nCode, WPARAM wp, LPARAM lp ) {
KBDLLHOOKSTRUCT *pkh = (KBDLLHOOKSTRUCT *) lp;
if ( nCode == HC_ACTION ) {
BOOL bCtrlKeyDown = GetAsyncKeyState( VK_CONTROL)>>((sizeof(SHORT) * 8) - 1 );
if ( ( pkh->vkCode == VK_ESCAPE && bCtrlKeyDown ) // Ctrl+Esc
|| ( pkh->vkCode == VK_TAB && pkh->flags & LLKHF_ALTDOWN ) // Alt+TAB
|| ( pkh->vkCode == VK_ESCAPE && pkh->flags & LLKHF_ALTDOWN ) // Alt+Esc
|| ( pkh->vkCode == VK_LWIN || pkh->vkCode == VK_RWIN ) // Start Menu
) {
if ( g_bBeep && ( wp == WM_SYSKEYDOWN || wp == WM_KEYDOWN ) ) {
MessageBeep( 0 ); // beep on downstroke if requested
}
return 1; // return without processing the key strokes
}
}
return CallNextHookEx( g_hHookKbdLL, nCode, wp, lp );
}
/*
================
AreTaskKeysDisabled
Are task keys disabled--ie, is hook installed?
Note: This assumes there's no other hook that does the same thing!
================
*/
BOOL AreTaskKeysDisabled() {
return g_hHookKbdLL != NULL;
}
/*
================
IsTaskMgrDisabled
================
*/
BOOL IsTaskMgrDisabled() {
HKEY hk;
if ( RegOpenKey( HKEY_CURRENT_USER, KEY_DisableTaskMgr, &hk ) != ERROR_SUCCESS ) {
return FALSE; // no key ==> not disabled
}
DWORD val = 0;
DWORD len = 4;
return RegQueryValueEx( hk, VAL_DisableTaskMgr, NULL, NULL, (BYTE*)&val, &len ) == ERROR_SUCCESS && val == 1;
}
/*
================
DisableTaskKeys
================
*/
void DisableTaskKeys( BOOL bDisable, BOOL bBeep, BOOL bTaskMgr ) {
// task keys (Ctrl+Esc, Alt-Tab, etc.)
if ( bDisable ) {
if ( !g_hHookKbdLL ) {
g_hHookKbdLL = SetWindowsHookEx( WH_KEYBOARD_LL, MyTaskKeyHookLL, win32.hInstance, 0 );
}
} else if ( g_hHookKbdLL != NULL ) {
UnhookWindowsHookEx( g_hHookKbdLL );
g_hHookKbdLL = NULL;
}
g_bBeep = bBeep;
// task manager (Ctrl+Alt+Del)
if ( bTaskMgr ) {
HKEY hk;
if ( RegOpenKey( HKEY_CURRENT_USER, KEY_DisableTaskMgr, &hk ) != ERROR_SUCCESS ) {
RegCreateKey( HKEY_CURRENT_USER, KEY_DisableTaskMgr, &hk );
}
if ( bDisable ) {
// disable TM: set policy = 1
DWORD val = 1;
RegSetValueEx( hk, VAL_DisableTaskMgr, NULL, REG_DWORD, (BYTE*)&val, sizeof(val) );
} else {
// enable TM: remove policy
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RegDeleteValue( hk,VAL_DisableTaskMgr );
}
}
}