trunk/PTD/PTD.cpp

/* PTD.cpp - Privacy Tray Dynamic
 *      Copyright (C) 2002-2009 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>

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 unsigned *journ_keys = 0;
static unsigned keyidx = 0;
static unsigned nkeys = 0;
static HHOOK journ_hook = NULL;  /* Journaling hook  handle. */


static LRESULT CALLBACK
PTD_CBT_proc (int code, WPARAM wparam, LPARAM lparam)
{
    HWND curr_hwnd = NULL;      
    DWORD proc_id = 0;
    
    if (code >= 0 && code == HCBT_SETFOCUS) {
        /* A window is about to receive the keyboard focus */           
        
        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 precise 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:
        /* Handle to the attached process */
        glob_hinst = hinst;
        break;
       
    case DLL_PROCESS_DETACH:
        break;
        
    case DLL_THREAD_ATTACH:  
    case DLL_THREAD_DETACH:  
        break;
        
    }
    
    return TRUE;
}
1	/* PTD.cpp - Privacy Tray Dynamic
2	* Copyright (C) 2002-2009 Timo Schulz
3	*
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	HINSTANCE glob_hinst;
24
25	/* We need a special section in the DLL for storing our shared data.
26	This shared data is required by the hook function because that
27	function is called in the context of the actual thread running the
28	hook and thus we need a way to communicate the result of our hook
29	function back to us. We use a shared data segment for this. */
30	#ifdef __GNUC__
31	#define ATTR_SEC __attribute__((section (".SHARDAT"), shared))
32	#else
33	#define ATTR_SEC
34	#pragma data_seg(".SHARDAT")
35	#endif
36	static HHOOK cbt_hook ATTR_SEC = NULL; /* CTB hook handle. */
37	static DWORD tray_proc_id ATTR_SEC = 0; /* WinPT PID */
38	static HWND shell_traywnd ATTR_SEC = 0; /* Tray window handle. */
39	static HWND curr_focus ATTR_SEC = NULL; /* Current window focus handle. */
40	static HWND rebar_w32 ATTR_SEC = NULL;
41	static HWND mstask_swc ATTR_SEC = NULL;
42	static HWND systab_c32 ATTR_SEC = NULL;
43	#ifndef __GNUC__
44	#pragma data_seg()
45	#endif
46	#undef ATTR_SEC
47
48	static unsigned *journ_keys = 0;
49	static unsigned keyidx = 0;
50	static unsigned nkeys = 0;
51	static HHOOK journ_hook = NULL; /* Journaling hook handle. */
52
53
54
55	static LRESULT CALLBACK
56	PTD_CBT_proc (int code, WPARAM wparam, LPARAM lparam)
57	{
58	HWND curr_hwnd = NULL;
59	DWORD proc_id = 0;
60
61	if (code >= 0 && code == HCBT_SETFOCUS) {
62	/* A window is about to receive the keyboard focus */
63
64	curr_hwnd = (HWND)wparam;
65	GetWindowThreadProcessId (curr_hwnd, &proc_id);
66	/* Only if the current window is different from this window list,
67	we set the new focus. For more information read the hint in
68	PTD_initialize. */
69	if ((proc_id != tray_proc_id)
70	&& (curr_hwnd != NULL)
71	&& (curr_hwnd != curr_focus)
72	&& (curr_hwnd != shell_traywnd)
73	&& (curr_hwnd != systab_c32)
74	&& (curr_hwnd != mstask_swc)
75	&& (curr_hwnd != rebar_w32)) {
76	curr_focus = curr_hwnd;
77	}
78	}
79
80	return CallNextHookEx (cbt_hook , code, wparam, lparam);
81	}
82
83
84	/* Return the last selected window */
85	extern "C" HWND
86	PTD_get_current_window (void)
87	{
88	return curr_focus;
89	}
90
91
92	/* Initialize CTB hook and try to find the system windows. */
93	extern "C" BOOL
94	PTD_initialize (void)
95	{
96	tray_proc_id = GetCurrentProcessId ();
97	cbt_hook = SetWindowsHookEx (WH_CBT, PTD_CBT_proc, glob_hinst, 0);
98	if (cbt_hook == NULL)
99	return FALSE;
100
101	/* Okay, what are we doing here:
102	* In the past I used the Spy++ application to find out why the old current
103	* window doesn't work on so much systems. Now we try to use the computer
104	* based training hook, more precise the HCBT_SETFOCUS to find out the
105	* last window focus. But to succeed we need to ignore some windows
106	* because otherwise our own window or a window from the taskbar
107	* would be recognized.
108	*
109	* Here is what the Spy++ says about the windows order:
110	* Shell_TrayWnd
111	* \ ReBarWindow32
112	* \ MSTaskSwWClass
113	* \ SysTabControl32
114	*
115	* As a result we need to ignore those windows to prevent failured
116	* in the code.
117	*/
118
119	// FIXME: I doubt this is working for Windows 7
120	shell_traywnd = FindWindowEx (NULL, NULL, "Shell_TrayWnd", NULL);
121	rebar_w32 = FindWindowEx (shell_traywnd, NULL, "ReBarWindow32", NULL);
122	mstask_swc = FindWindowEx (rebar_w32, NULL, "MSTaskSwWClass", NULL);
123	systab_c32 = FindWindowEx (mstask_swc, NULL, "SysTabControl32", NULL);
124
125	/*debug ("tray_proc_id=%u cbt_hook=%p shell_traywnd=%p rebar_w32=%p "
126	"mstask_swc=%p systab_c32=%p",
127	tray_proc_id, cbt_hook, shell_traywnd, rebar_w32,
128	mstask_swc, systab_c32);*/
129
130	return TRUE;
131	}
132
133
134	/* Remove the CTB hook from the system and reset all variables. */
135	extern "C" void
136	PTD_delete_hook (void)
137	{
138	if (!cbt_hook)
139	return;
140	UnhookWindowsHookEx (cbt_hook);
141	cbt_hook = NULL;
142	shell_traywnd = NULL;
143	tray_proc_id = 0;
144	}
145
146
147	/* Return if the CTB hook is currently used. */
148	extern "C" int
149	PTD_is_hook_used (void)
150	{
151	return shell_traywnd && cbt_hook;
152	}
153
154	/* From the MSDN:
155	* "Typically, an application uses this function to play back a series
156	* of mouse and keyboard messages recorded previously by the
157	* JournalRecordProc hook procedure. As long as a JournalPlaybackProc
158	* hook procedure is installed, regular mouse and keyboard input is disabled."
159	*/
160	static LRESULT CALLBACK
161	PTD_playback_proc (int code, WPARAM wparam, LPARAM lparam)
162	{
163	LPEVENTMSG em;
164
165	if (code == HC_SKIP) {
166	keyidx++;
167	if (keyidx >= nkeys) {
168	UnhookWindowsHookEx (journ_hook);
169	journ_hook = NULL;
170	}
171	return 0;
172	}
173	else if (code == HC_GETNEXT) {
174	/* Here is an overview what the event message struct can contain:
175	* message - WM_KEYUP, WM_KEYDOWN, WM_SYSKEYUP, WM_SYSKEYDOWN:
176	* paramL - specifies the virtual key code of the key that was pressed.
177	* paramH - specifies the scan code.
178	*/
179	em = (LPEVENTMSG )lparam;
180	if (journ_keys[keyidx] & 0x8000)
181	em->message = journ_keys[keyidx] & 0x4000 ? WM_SYSKEYDOWN : WM_KEYDOWN;
182	else
183	em->message = journ_keys[keyidx] & 0x4000 ? WM_SYSKEYUP : WM_KEYUP;
184	em->paramL = LOBYTE (journ_keys[keyidx])
185	\| (MapVirtualKey (LOBYTE (journ_keys[keyidx]), 0) << 8);
186	em->paramH = 1;
187	em->time = GetTickCount ();
188	return 0;
189	}
190
191	return CallNextHookEx (journ_hook, code, wparam, lparam);
192	}
193
194
195
196	extern "C" BOOL
197	PTD_keyboard_send_keys (UINT *keys, UINT n_keys)
198	{
199	MSG msg;
200	journ_keys = keys;
201	keyidx = 0;
202	nkeys = n_keys;
203
204	/* Return immediately if there is an active hook */
205	if (journ_hook)
206	return FALSE;
207
208	while (GetAsyncKeyState (VK_MENU) & 0x8000 \|\|
209	GetAsyncKeyState (VK_SHIFT) & 0x8000 \|\|
210	GetAsyncKeyState (VK_CONTROL) & 0x8000) {
211	if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
212	if (msg.message == WM_QUIT) {
213	PostMessage (msg.hwnd, msg.message, msg.wParam, msg.lParam);
214	return FALSE;
215	}
216	TranslateMessage (&msg);
217	DispatchMessage (&msg);
218	}
219	}
220	journ_hook = SetWindowsHookEx (WH_JOURNALPLAYBACK,
221	(HOOKPROC)PTD_playback_proc,
222	glob_hinst, 0);
223	if (journ_hook == NULL)
224	return FALSE;
225
226	while (journ_hook) {
227	if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
228	if (msg.message == WM_QUIT) {
229	if (journ_hook)
230	UnhookWindowsHookEx (journ_hook);
231	PostMessage (msg.hwnd, msg.message, msg.wParam, msg.wParam);
232	}
233	TranslateMessage (&msg);
234	DispatchMessage (&msg);
235	}
236	}
237
238	return TRUE;
239	}
240
241
242	/* Main entry point for the DLL */
243	extern "C" BOOL WINAPI
244	DllMain (HINSTANCE hinst, DWORD reason, LPVOID reserv)
245	{
246	switch (reason) {
247	case DLL_PROCESS_ATTACH:
248	/* Handle to the attached process */
249	glob_hinst = hinst;
250	break;
251
252	case DLL_PROCESS_DETACH:
253	break;
254
255	case DLL_THREAD_ATTACH:
256	case DLL_THREAD_DETACH:
257	break;
258
259	}
260
261	return TRUE;
262	}