trunk/PTD/PTD.cpp

/* PTD.cpp - Privacy Tray Dynamic
 *      Copyright (C) 2002-2009, 2012 Timo Schulz
 *
 * This file is part of WinPT.
 *
 * WinPT 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.
 * 
 * WinPT 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.
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <windows.h>
#include <stdio.h>

/* Reference to the DLL module handle */
HINSTANCE glob_hinst;

/* We need a special section in the DLL for storing our shared data.
   This shared data is required by the hook function because that
   function is called in the context of the actual thread running the
   hook and thus we need a way to communicate the result of our hook
   function back to us.  We use a shared data segment for this. */
#ifdef __GNUC__
#define ATTR_SEC __attribute__((section (".SHARDAT"), shared))
#else
#define ATTR_SEC
#pragma data_seg(".SHARDAT")
#endif
static HHOOK cbt_hook      ATTR_SEC = NULL; /* CTB hook handle. */
static DWORD tray_proc_id  ATTR_SEC = 0;    /* WinPT PID */
static HWND  shell_traywnd ATTR_SEC = 0;    /* Tray window handle. */
static HWND  curr_focus    ATTR_SEC = NULL; /* Current window focus handle. */
static HWND  rebar_w32     ATTR_SEC = NULL;
static HWND  mstask_swc    ATTR_SEC = NULL;
static HWND  systab_c32    ATTR_SEC = NULL;
#ifndef __GNUC__
#pragma data_seg()
#endif
#undef ATTR_SEC

/* Static variables that are used to record and replay key strokes */
static unsigned *journ_keys = 0;
static unsigned keyidx = 0;
static unsigned nkeys = 0;
static HHOOK journ_hook = NULL;  /* Journaling hook  handle. */


/* Callback function for the Computer Based Training (CBT) hook */
static LRESULT CALLBACK
PTD_CBT_proc (int code, WPARAM wparam, LPARAM lparam)
{
    HWND curr_hwnd;
    DWORD proc_id;
    
    if (code >= 0 && code == HCBT_SETFOCUS) {
        /* A window is about to receive the keyboard focus */           
        
        proc_id = 0;
        curr_hwnd = (HWND)wparam;
        GetWindowThreadProcessId (curr_hwnd, &proc_id);
        /* Only if the current window is different from this window list,
           we set the new focus. For more information read the hint in 
           PTD_initialize. */
        if ((proc_id != tray_proc_id) &&
            (curr_hwnd != NULL) &&
            (curr_hwnd != curr_focus) &&
            (curr_hwnd != shell_traywnd) &&
            (curr_hwnd != systab_c32) &&
            (curr_hwnd != mstask_swc) &&
            (curr_hwnd != rebar_w32)) {
            curr_focus = curr_hwnd;
        }
    }
    
    return  CallNextHookEx (cbt_hook , code, wparam, lparam);
}


/* Return the last selected window */
extern "C" HWND
PTD_get_current_window (void)
{
    return curr_focus;
}


/* Initialize CTB hook and try to find the system windows. */
extern "C" BOOL
PTD_initialize (void)
{
    tray_proc_id = GetCurrentProcessId ();
    cbt_hook = SetWindowsHookEx (WH_CBT, PTD_CBT_proc, glob_hinst, 0);
    if (cbt_hook == NULL)
        return FALSE;
    
    /* Okay, what are we doing here:
     * In the past I used the Spy++ application to find out why the old current 
     * window doesn't work on so much systems. Now we try to use the computer 
     * based training hook, more precisely the HCBT_SETFOCUS to find out the 
     * last window focus. But to succeed we need to ignore some windows 
     * because otherwise our own window or a window from the taskbar
     * would be recognized.
     *
     * Here is what the Spy++ says about the windows order:
     * Shell_TrayWnd
     *  \ ReBarWindow32
     *                \ MSTaskSwWClass
     *                               \ SysTabControl32
     * 
     * As a result we need to ignore those windows to prevent failured 
     * in the code.
     */
    
    // FIXME: I doubt this is working for Windows 7
    shell_traywnd = FindWindowEx (NULL, NULL, "Shell_TrayWnd", NULL);
    rebar_w32 = FindWindowEx (shell_traywnd, NULL, "ReBarWindow32", NULL);
    mstask_swc = FindWindowEx (rebar_w32, NULL, "MSTaskSwWClass", NULL);
    systab_c32 = FindWindowEx (mstask_swc, NULL, "SysTabControl32", NULL);
    
    /*debug ("tray_proc_id=%u cbt_hook=%p shell_traywnd=%p rebar_w32=%p "
             "mstask_swc=%p systab_c32=%p",
             tray_proc_id, cbt_hook, shell_traywnd, rebar_w32, 
             mstask_swc, systab_c32);*/
    
    return TRUE;
}


/* Remove the CTB hook from the system and reset all variables. */
extern "C" void
PTD_delete_hook (void)
{
    if (!cbt_hook)
        return;
    UnhookWindowsHookEx (cbt_hook);
    cbt_hook = NULL;
    shell_traywnd = NULL;
    tray_proc_id = 0;
}


/* Return if the CTB hook is currently used. */
extern "C" int
PTD_is_hook_used (void)
{
    return shell_traywnd && cbt_hook;
}

/* From the MSDN:
 * "Typically, an application uses this function to play back a series
 * of mouse and keyboard messages recorded previously by the
 * JournalRecordProc hook procedure. As long as a JournalPlaybackProc
 * hook procedure is installed, regular mouse and keyboard input is disabled."
 */
static LRESULT CALLBACK 
PTD_playback_proc (int code, WPARAM wparam, LPARAM lparam)
{
    LPEVENTMSG em;
    
    if (code == HC_SKIP) {
        keyidx++;
        if (keyidx >= nkeys) {
            UnhookWindowsHookEx (journ_hook);
            journ_hook = NULL;
        }
        return 0;
    }
    else if (code == HC_GETNEXT) {
        /* Here is an overview what the event message struct can contain:
         * message - WM_KEYUP, WM_KEYDOWN, WM_SYSKEYUP, WM_SYSKEYDOWN:
         * paramL - specifies the virtual key code of the key that was pressed.
         * paramH - specifies the scan code.                            
         */
        em = (LPEVENTMSG )lparam;
        if (journ_keys[keyidx] & 0x8000)
            em->message = journ_keys[keyidx] & 0x4000 ? WM_SYSKEYDOWN : WM_KEYDOWN;
        else 
            em->message = journ_keys[keyidx] & 0x4000 ? WM_SYSKEYUP : WM_KEYUP;
        em->paramL = LOBYTE (journ_keys[keyidx])
            | (MapVirtualKey (LOBYTE (journ_keys[keyidx]), 0) << 8);
        em->paramH = 1;
        em->time = GetTickCount ();
        return 0;
    }
    
    return CallNextHookEx (journ_hook, code, wparam, lparam);
}


extern "C" BOOL
PTD_keyboard_send_keys (UINT *keys, UINT n_keys)
{
    MSG msg;
    journ_keys = keys;
    keyidx = 0;
    nkeys = n_keys;
    
    /* Return immediately if there is an active hook */
    if (journ_hook)
        return FALSE;
    
    while (GetAsyncKeyState (VK_MENU) & 0x8000 ||
           GetAsyncKeyState (VK_SHIFT) & 0x8000 ||
           GetAsyncKeyState (VK_CONTROL) & 0x8000) {
        if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
            if (msg.message == WM_QUIT) {
                PostMessage (msg.hwnd, msg.message, msg.wParam, msg.lParam);
                return FALSE;
            }
            TranslateMessage (&msg);
            DispatchMessage (&msg);
        }
    }
    journ_hook = SetWindowsHookEx (WH_JOURNALPLAYBACK,
                                   (HOOKPROC)PTD_playback_proc,
                                   glob_hinst, 0);
    if (journ_hook == NULL)
        return FALSE;
    
    while (journ_hook) {
        if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
            if (msg.message == WM_QUIT) {
                if (journ_hook)
                    UnhookWindowsHookEx (journ_hook);
                PostMessage (msg.hwnd, msg.message, msg.wParam, msg.wParam);
            }
            TranslateMessage (&msg);
            DispatchMessage (&msg);
        }
    }
    
    return TRUE;
}


/* Main entry point for the DLL */
extern "C" BOOL WINAPI 
DllMain (HINSTANCE hinst, DWORD reason, LPVOID reserv)
{
    switch (reason)  {
    case DLL_PROCESS_ATTACH:
        glob_hinst = hinst;
        break;
       
    case DLL_PROCESS_DETACH:
        break;
        
    case DLL_THREAD_ATTACH:  
    case DLL_THREAD_DETACH:  
        break;
        
    }
    
    return TRUE;
}
1	werner	46	/* PTD.cpp - Privacy Tray Dynamic
2	twoaday	412	* Copyright (C) 2002-2009, 2012 Timo Schulz
3	werner	46	*
4			* This file is part of WinPT.
5			*
6			* WinPT is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* WinPT is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*/
16			#ifdef HAVE_CONFIG_H
17			#include <config.h>
18			#endif
19
20			#include <windows.h>
21			#include <stdio.h>
22
23	twoaday	412	/* Reference to the DLL module handle */
24	werner	46	HINSTANCE glob_hinst;
25
26	werner	61	/* We need a special section in the DLL for storing our shared data.
27	twoaday	261	This shared data is required by the hook function because that
28	werner	61	function is called in the context of the actual thread running the
29			hook and thus we need a way to communicate the result of our hook
30			function back to us. We use a shared data segment for this. */
31			#ifdef __GNUC__
32			#define ATTR_SEC __attribute__((section (".SHARDAT"), shared))
33			#else
34			#define ATTR_SEC
35	werner	46	#pragma data_seg(".SHARDAT")
36	werner	61	#endif
37			static HHOOK cbt_hook ATTR_SEC = NULL; /* CTB hook handle. */
38			static DWORD tray_proc_id ATTR_SEC = 0; /* WinPT PID */
39			static HWND shell_traywnd ATTR_SEC = 0; /* Tray window handle. */
40			static HWND curr_focus ATTR_SEC = NULL; /* Current window focus handle. */
41			static HWND rebar_w32 ATTR_SEC = NULL;
42			static HWND mstask_swc ATTR_SEC = NULL;
43			static HWND systab_c32 ATTR_SEC = NULL;
44			#ifndef __GNUC__
45	werner	46	#pragma data_seg()
46	werner	61	#endif
47			#undef ATTR_SEC
48	werner	46
49	twoaday	412	/* Static variables that are used to record and replay key strokes */
50	werner	46	static unsigned *journ_keys = 0;
51	twoaday	305	static unsigned keyidx = 0;
52	werner	46	static unsigned nkeys = 0;
53	twoaday	273	static HHOOK journ_hook = NULL; /* Journaling hook handle. */
54	werner	46
55
56	twoaday	412	/* Callback function for the Computer Based Training (CBT) hook */
57	werner	46	static LRESULT CALLBACK
58			PTD_CBT_proc (int code, WPARAM wparam, LPARAM lparam)
59			{
60	twoaday	412	HWND curr_hwnd;
61			DWORD proc_id;
62	werner	46
63			if (code >= 0 && code == HCBT_SETFOCUS) {
64			/* A window is about to receive the keyboard focus */
65
66	twoaday	412	proc_id = 0;
67	werner	46	curr_hwnd = (HWND)wparam;
68	twoaday	273	GetWindowThreadProcessId (curr_hwnd, &proc_id);
69	werner	46	/* Only if the current window is different from this window list,
70			we set the new focus. For more information read the hint in
71			PTD_initialize. */
72	twoaday	412	if ((proc_id != tray_proc_id) &&
73			(curr_hwnd != NULL) &&
74			(curr_hwnd != curr_focus) &&
75			(curr_hwnd != shell_traywnd) &&
76			(curr_hwnd != systab_c32) &&
77			(curr_hwnd != mstask_swc) &&
78			(curr_hwnd != rebar_w32)) {
79	werner	46	curr_focus = curr_hwnd;
80			}
81			}
82
83			return CallNextHookEx (cbt_hook , code, wparam, lparam);
84			}
85
86
87			/* Return the last selected window */
88			extern "C" HWND
89	twoaday	334	PTD_get_current_window (void)
90	werner	46	{
91			return curr_focus;
92			}
93
94
95			/* Initialize CTB hook and try to find the system windows. */
96			extern "C" BOOL
97			PTD_initialize (void)
98			{
99			tray_proc_id = GetCurrentProcessId ();
100			cbt_hook = SetWindowsHookEx (WH_CBT, PTD_CBT_proc, glob_hinst, 0);
101			if (cbt_hook == NULL)
102			return FALSE;
103
104			/* Okay, what are we doing here:
105			* In the past I used the Spy++ application to find out why the old current
106			* window doesn't work on so much systems. Now we try to use the computer
107	twoaday	412	* based training hook, more precisely the HCBT_SETFOCUS to find out the
108	werner	46	* last window focus. But to succeed we need to ignore some windows
109			* because otherwise our own window or a window from the taskbar
110			* would be recognized.
111			*
112			* Here is what the Spy++ says about the windows order:
113			* Shell_TrayWnd
114			* \ ReBarWindow32
115			* \ MSTaskSwWClass
116			* \ SysTabControl32
117			*
118			* As a result we need to ignore those windows to prevent failured
119			* in the code.
120			*/
121	twoaday	334
122			// FIXME: I doubt this is working for Windows 7
123	werner	46	shell_traywnd = FindWindowEx (NULL, NULL, "Shell_TrayWnd", NULL);
124			rebar_w32 = FindWindowEx (shell_traywnd, NULL, "ReBarWindow32", NULL);
125			mstask_swc = FindWindowEx (rebar_w32, NULL, "MSTaskSwWClass", NULL);
126			systab_c32 = FindWindowEx (mstask_swc, NULL, "SysTabControl32", NULL);
127
128	twoaday	305	/*debug ("tray_proc_id=%u cbt_hook=%p shell_traywnd=%p rebar_w32=%p "
129			"mstask_swc=%p systab_c32=%p",
130			tray_proc_id, cbt_hook, shell_traywnd, rebar_w32,
131			mstask_swc, systab_c32);*/
132	werner	46
133			return TRUE;
134			}
135
136
137			/* Remove the CTB hook from the system and reset all variables. */
138			extern "C" void
139	twoaday	334	PTD_delete_hook (void)
140	werner	46	{
141			if (!cbt_hook)
142			return;
143			UnhookWindowsHookEx (cbt_hook);
144			cbt_hook = NULL;
145			shell_traywnd = NULL;
146			tray_proc_id = 0;
147			}
148
149
150			/* Return if the CTB hook is currently used. */
151			extern "C" int
152	twoaday	334	PTD_is_hook_used (void)
153	werner	46	{
154			return shell_traywnd && cbt_hook;
155			}
156
157	twoaday	334	/* From the MSDN:
158			* "Typically, an application uses this function to play back a series
159			* of mouse and keyboard messages recorded previously by the
160			* JournalRecordProc hook procedure. As long as a JournalPlaybackProc
161			* hook procedure is installed, regular mouse and keyboard input is disabled."
162			*/
163	werner	46	static LRESULT CALLBACK
164			PTD_playback_proc (int code, WPARAM wparam, LPARAM lparam)
165			{
166			LPEVENTMSG em;
167
168			if (code == HC_SKIP) {
169	twoaday	305	keyidx++;
170	twoaday	334	if (keyidx >= nkeys) {
171	werner	46	UnhookWindowsHookEx (journ_hook);
172			journ_hook = NULL;
173			}
174			return 0;
175			}
176			else if (code == HC_GETNEXT) {
177			/* Here is an overview what the event message struct can contain:
178			* message - WM_KEYUP, WM_KEYDOWN, WM_SYSKEYUP, WM_SYSKEYDOWN:
179			* paramL - specifies the virtual key code of the key that was pressed.
180			* paramH - specifies the scan code.
181			*/
182			em = (LPEVENTMSG )lparam;
183	twoaday	305	if (journ_keys[keyidx] & 0x8000)
184			em->message = journ_keys[keyidx] & 0x4000 ? WM_SYSKEYDOWN : WM_KEYDOWN;
185	werner	46	else
186	twoaday	305	em->message = journ_keys[keyidx] & 0x4000 ? WM_SYSKEYUP : WM_KEYUP;
187	twoaday	334	em->paramL = LOBYTE (journ_keys[keyidx])
188	twoaday	305	\| (MapVirtualKey (LOBYTE (journ_keys[keyidx]), 0) << 8);
189	werner	46	em->paramH = 1;
190			em->time = GetTickCount ();
191			return 0;
192			}
193
194			return CallNextHookEx (journ_hook, code, wparam, lparam);
195	twoaday	248	}
196	werner	46
197
198
199			extern "C" BOOL
200	twoaday	334	PTD_keyboard_send_keys (UINT *keys, UINT n_keys)
201	werner	46	{
202			MSG msg;
203			journ_keys = keys;
204	twoaday	305	keyidx = 0;
205	twoaday	334	nkeys = n_keys;
206	werner	46
207	twoaday	334	/* Return immediately if there is an active hook */
208	werner	46	if (journ_hook)
209			return FALSE;
210
211	twoaday	334	while (GetAsyncKeyState (VK_MENU) & 0x8000 \|\|
212			GetAsyncKeyState (VK_SHIFT) & 0x8000 \|\|
213			GetAsyncKeyState (VK_CONTROL) & 0x8000) {
214	werner	46	if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
215			if (msg.message == WM_QUIT) {
216			PostMessage (msg.hwnd, msg.message, msg.wParam, msg.lParam);
217			return FALSE;
218			}
219			TranslateMessage (&msg);
220			DispatchMessage (&msg);
221			}
222			}
223			journ_hook = SetWindowsHookEx (WH_JOURNALPLAYBACK,
224			(HOOKPROC)PTD_playback_proc,
225			glob_hinst, 0);
226			if (journ_hook == NULL)
227			return FALSE;
228
229			while (journ_hook) {
230			if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
231			if (msg.message == WM_QUIT) {
232			if (journ_hook)
233			UnhookWindowsHookEx (journ_hook);
234			PostMessage (msg.hwnd, msg.message, msg.wParam, msg.wParam);
235			}
236			TranslateMessage (&msg);
237			DispatchMessage (&msg);
238			}
239			}
240
241			return TRUE;
242			}
243
244
245	twoaday	334	/* Main entry point for the DLL */
246	twoaday	248	extern "C" BOOL WINAPI
247	werner	46	DllMain (HINSTANCE hinst, DWORD reason, LPVOID reserv)
248			{
249			switch (reason) {
250	twoaday	334	case DLL_PROCESS_ATTACH:
251	twoaday	325	glob_hinst = hinst;
252	werner	46	break;
253	twoaday	325
254			case DLL_PROCESS_DETACH:
255			break;
256
257	werner	46	case DLL_THREAD_ATTACH:
258			case DLL_THREAD_DETACH:
259			break;
260	twoaday	325
261	werner	46	}
262	twoaday	325
263	werner	46	return TRUE;
264			}