AppleWin/source/Windows/HookFilter.cpp

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/*
AppleWin : An Apple //e emulator for Windows
Copyright (C) 1994-1996, Michael O'Brien
Copyright (C) 1999-2001, Oliver Schmidt
Copyright (C) 2002-2005, Tom Charlesworth
Copyright (C) 2006-2021, Tom Charlesworth, Michael Pohoreski
AppleWin 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 2 of the License, or
(at your option) any later version.
AppleWin 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 AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Description: HookFilter
*
* Author: Various
*/
#include "StdAfx.h"
#include "HookFilter.h"
#include "AppleWin.h"
#include "Interface.h"
#include "Log.h"
HookFilter& GetHookFilter(void)
{
static HookFilter hookFilter;
return hookFilter;
}
LRESULT CALLBACK HookFilter::LowLevelKeyboardProc(_In_ int nCode, _In_ WPARAM wParam, _In_ LPARAM lParam)
{
if (nCode == HC_ACTION)
{
bool suppress = false;
PKBDLLHOOKSTRUCT pKbdLlHookStruct = (PKBDLLHOOKSTRUCT) lParam;
UINT newMsg = pKbdLlHookStruct->flags & LLKHF_UP ? WM_KEYUP : WM_KEYDOWN;
LPARAM newlParam = newMsg == WM_KEYUP ? 3<<30 : 0; // b31:transition state, b30:previous key state
//
// NB. Alt Gr (Right-Alt): this normally send 2 WM_KEYDOWN messages for: VK_LCONTROL, then VK_RMENU
// Keyboard scanCodes: LCONTROL=0x1D, LCONTROL_from_RMENU=0x21D
// . For: Microsoft PS/2/Win7-64, VAIO laptop/Win7-64, Microsoft USB/Win10-64
// NB. WM_KEYDOWN also includes a 9/10-bit? scanCode: LCONTROL=0x1D, RCONTROL=0x11D, RMENU=0x1D(not 0x21D)
// . Can't suppress in app, since scanCode is not >= 0x200
if (GetHookFilter().m_bHookAltGrControl && pKbdLlHookStruct->vkCode == VK_LCONTROL && pKbdLlHookStruct->scanCode >= 0x200) // GH#558
{
suppress = true;
}
// Suppress alt-tab
if (GetHookFilter().m_bHookAltTab && pKbdLlHookStruct->vkCode == VK_TAB && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
{
PostMessage(GetHookFilter().m_hFrameWindow, newMsg, VK_TAB, newlParam);
suppress = true;
}
// Suppress alt-escape
if (pKbdLlHookStruct->vkCode == VK_ESCAPE && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
{
PostMessage(GetHookFilter().m_hFrameWindow, newMsg, VK_ESCAPE, newlParam);
suppress = true;
}
// Suppress alt-space
if (pKbdLlHookStruct->vkCode == VK_SPACE && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
{
PostMessage(GetHookFilter().m_hFrameWindow, newMsg, VK_SPACE, newlParam);
suppress = true;
}
// Suppress ctrl-escape
if (pKbdLlHookStruct->vkCode == VK_ESCAPE)
{
// But don't suppress CTRL+SHIFT+ESC
if (GetKeyState(VK_CONTROL) < 0 && GetKeyState(VK_SHIFT) >= 0)
suppress = true;
}
// Suppress keys by returning 1
if (suppress)
return 1;
}
return CallNextHookEx(0/*parameter is ignored*/, nCode, wParam, lParam);
}
//---------------------------------------------------------------------------
// The hook filter code can be static (within the application) rather than in a DLL.
// Pre: g_hFrameWindow must be valid
bool HookFilter::HookFilterForKeyboard(void)
{
_ASSERT(GetFrame().g_hFrameWindow);
m_hFrameWindow = GetFrame().g_hFrameWindow;
m_bHookAltTab = GetHookAltTab();
m_bHookAltGrControl = GetHookAltGrControl();
// Since no DLL gets injected anyway for low-level hooks, we can use, for example, GetModuleHandle("kernel32.dll")
HINSTANCE hinstDLL = GetModuleHandle("kernel32.dll");
m_hhook = SetWindowsHookEx(
WH_KEYBOARD_LL,
LowLevelKeyboardProc,
hinstDLL,
0);
if (m_hhook != 0 && GetFrame().g_hFrameWindow != 0)
return true;
std::string msg("Failed to install hook filter for system keys");
DWORD dwErr = GetLastError();
GetFrame().FrameMessageBox(msg.c_str(), "Warning", MB_ICONASTERISK | MB_OK);
msg += "\n";
LogFileOutput(msg.c_str());
return false;
}
void HookFilter::UnhookFilterForKeyboard(void)
{
UnhookWindowsHookEx(m_hhook);
}
DWORD WINAPI HookFilter::HookThread(LPVOID lpParameter)
{
HookFilter* hf = (HookFilter*)lpParameter;
if (!hf->HookFilterForKeyboard())
return -1;
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) > 0)
{
if (msg.message == WM_QUIT)
break;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
hf->UnhookFilterForKeyboard();
return 0;
}
bool HookFilter::InitHookThread(void)
{
m_hHookThread = CreateThread(NULL, // lpThreadAttributes
0, // dwStackSize
(LPTHREAD_START_ROUTINE)HookThread,
this, // lpParameter
0, // dwCreationFlags : 0 = Run immediately
&m_HookThreadId); // lpThreadId
if (m_hHookThread == NULL)
return false;
return true;
}
void HookFilter::UninitHookThread(void)
{
if (m_hHookThread)
{
if (!PostThreadMessage(m_HookThreadId, WM_QUIT, 0, 0))
{
_ASSERT(0);
return;
}
do
{
DWORD dwExitCode;
if (GetExitCodeThread(m_hHookThread, &dwExitCode))
{
if (dwExitCode == STILL_ACTIVE)
Sleep(10);
else
break;
}
} while (1);
CloseHandle(m_hHookThread);
m_hHookThread = NULL;
m_HookThreadId = 0;
}
}