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/*
*Copyright (C) 2004 Harold L Hunt II All Rights Reserved.
*
*Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
*"Software"), to deal in the Software without restriction, including
*without limitation the rights to use, copy, modify, merge, publish,
*distribute, sublicense, and/or sell copies of the Software, and to
*permit persons to whom the Software is furnished to do so, subject to
*the following conditions:
*
*The above copyright notice and this permission notice shall be
*included in all copies or substantial portions of the Software.
*
*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
*EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
*MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
*NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
*ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
*CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
*WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*Except as contained in this notice, the name of Harold L Hunt II
*shall not be used in advertising or otherwise to promote the sale, use
*or other dealings in this Software without prior written authorization
*from Harold L Hunt II.
*
* Authors: Harold L Hunt II
*/
#include "win.h"
/*
* References to external symbols
*/
extern HHOOK g_hhookKeyboardLL;
extern DWORD g_dwCurrentThreadID;
extern HWND g_hwndKeyboardFocus;
/*
* Function prototypes
*/
static LRESULT CALLBACK
winKeyboardMessageHookLL (int iCode, WPARAM wParam, LPARAM lParam);
#ifndef LLKHF_EXTENDED
# define LLKHF_EXTENDED 0x00000001
#endif
#ifndef LLKHF_UP
# define LLKHF_UP 0x00000080
#endif
/*
* KeyboardMessageHook
*/
static LRESULT CALLBACK
winKeyboardMessageHookLL (int iCode, WPARAM wParam, LPARAM lParam)
{
BOOL fPassKeystroke = FALSE;
PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) lParam;
HWND hwnd = GetActiveWindow();
/* Pass keystrokes on to our main message loop */
if (iCode == HC_ACTION)
{
#if 0
ErrorF ("vkCode: %08x\tscanCode: %08x\n", p->vkCode, p->scanCode);
#endif
switch (wParam)
{
case WM_KEYDOWN: case WM_SYSKEYDOWN:
case WM_KEYUP: case WM_SYSKEYUP:
fPassKeystroke =
((p->vkCode == VK_TAB) && ((p->flags & LLKHF_ALTDOWN) != 0))
|| (p->vkCode == VK_LWIN) || (p->vkCode == VK_RWIN)
;
break;
}
}
/*
* Pass message on to our main message loop.
* We process this immediately with SendMessage so that the keystroke
* appears in, hopefully, the correct order.
*/
if (fPassKeystroke)
{
LPARAM lParamKey = 0x0;
/* Construct the lParam from KBDLLHOOKSTRUCT */
lParamKey = lParamKey | (0x0000FFFF & 0x00000001); /* Repeat count */
lParamKey = lParamKey | (0x00FF0000 & (p->scanCode << 16));
lParamKey = lParamKey
| (0x01000000 & ((p->flags & LLKHF_EXTENDED) << 23));
lParamKey = lParamKey
| (0x20000000
& ((p->flags & LLKHF_ALTDOWN) << 24));
lParamKey = lParamKey | (0x80000000 & ((p->flags & LLKHF_UP) << 24));
/* Send message to our main window that has the keyboard focus */
PostMessage (hwnd,
(UINT) wParam,
(WPARAM) p->vkCode,
lParamKey);
return 1;
}
/* Call next hook */
return CallNextHookEx (NULL, iCode, wParam, lParam);
}
/*
* Attempt to install the keyboard hook, return FALSE if it was not installed
*/
Bool
winInstallKeyboardHookLL ()
{
OSVERSIONINFO osvi = {0};
/* Get operating system version information */
osvi.dwOSVersionInfoSize = sizeof (osvi);
GetVersionEx (&osvi);
/* Branch on platform ID */
switch (osvi.dwPlatformId)
{
case VER_PLATFORM_WIN32_NT:
/* Low-level is supported on NT 4.0 SP3+ only */
/* TODO: Return FALSE on NT 4.0 with no SP, SP1, or SP2 */
break;
case VER_PLATFORM_WIN32_WINDOWS:
/* Low-level hook is not supported on non-NT */
return FALSE;
}
/* Install the hook only once */
if (!g_hhookKeyboardLL)
g_hhookKeyboardLL = SetWindowsHookEx (WH_KEYBOARD_LL,
winKeyboardMessageHookLL,
g_hInstance,
0);
return TRUE;
}
/*
* Remove the keyboard hook if it is installed
*/
void
winRemoveKeyboardHookLL ()
{
if (g_hhookKeyboardLL)
UnhookWindowsHookEx (g_hhookKeyboardLL);
g_hhookKeyboardLL = NULL;
}
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