ServerExe/HookDll/hookdll.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Seamless windows - Remote server hook DLL

   Based on code copyright (C) 2004-2005 Martin Wickett

   Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006
   Copyright (C) Pierre Ossman <ossman@cendio.se> 2006

   This program 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.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <stdio.h>
#include <stdarg.h>

#include <windows.h>
#include <winuser.h>

#include "../vchannel.h"

#define DLL_EXPORT __declspec(dllexport)

#ifdef __GNUC__
#define SHARED __attribute__((section ("SHAREDDATA"), shared))
#else
#define SHARED
#endif

// Shared DATA
#pragma data_seg ( "SHAREDDATA" )

// this is the total number of processes this dll is currently attached to
int g_instance_count SHARED = 0;

// blocks for locally generated events
RECT g_block_move SHARED = { 0, 0, 0, 0 };
HWND g_blocked_zchange[2] SHARED = { NULL, NULL };
HWND g_blocked_focus SHARED = NULL;
int g_blocked_state SHARED = -1;

#pragma data_seg ()

#pragma comment(linker, "/section:SHAREDDATA,rws")

#define FOCUS_MSG_NAME "WM_SEAMLESS_FOCUS"
static UINT g_wm_seamless_focus;

static HHOOK g_cbt_hook = NULL;
static HHOOK g_wndproc_hook = NULL;
static HHOOK g_wndprocret_hook = NULL;

static HINSTANCE g_instance = NULL;

static HANDLE g_mutex = NULL;

static void
update_position(HWND hwnd)
{
        RECT rect, blocked;

        if (!GetWindowRect(hwnd, &rect))
        {
                debug("GetWindowRect failed!\n");
                return;
        }

        WaitForSingleObject(g_mutex, INFINITE);
        memcpy(&blocked, &g_block_move, sizeof(RECT));
        ReleaseMutex(g_mutex);

        if ((rect.left == blocked.left) && (rect.top == blocked.top)
            && (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
                return;

        vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
                       hwnd,
                       rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
}

static LRESULT CALLBACK
wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd, parent;
        UINT msg;
        WPARAM wparam;
        LPARAM lparam;

        LONG style;

        if (code < 0)
                goto end;

        hwnd = ((CWPSTRUCT *) details)->hwnd;
        msg = ((CWPSTRUCT *) details)->message;
        wparam = ((CWPSTRUCT *) details)->wParam;
        lparam = ((CWPSTRUCT *) details)->lParam;

        style = GetWindowLong(hwnd, GWL_STYLE);

        /* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
           but they exist nonetheless. */
        if ((style & WS_CHILD) && !(style & WS_POPUP))
                goto end;

        if (style & WS_POPUP)
        {
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
                if (!parent)
                        parent = (HWND) - 1;
        }
        else
                parent = NULL;

        switch (msg)
        {
                case WM_WINDOWPOSCHANGED:
                        {
                                WINDOWPOS *wp = (WINDOWPOS *) lparam;

                                if (wp->flags & SWP_SHOWWINDOW)
                                {
                                        unsigned short title[150];
                                        int state;

                                        vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);

                                        GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));

                                        vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
                                                       vchannel_strfilter_unicode(title), 0);

                                        if (style & WS_MAXIMIZE)
                                                state = 2;
                                        else if (style & WS_MINIMIZE)
                                                state = 1;
                                        else
                                                state = 0;

                                        update_position(hwnd);

                                        vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
                                }

                                if (wp->flags & SWP_HIDEWINDOW)
                                        vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);

                                if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                        break;

                                if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
                                        update_position(hwnd);

                                if (!(wp->flags & SWP_NOZORDER))
                                {
                                        HWND block_hwnd, block_behind;
                                        WaitForSingleObject(g_mutex, INFINITE);
                                        block_hwnd = g_blocked_zchange[0];
                                        block_behind = g_blocked_zchange[1];
                                        ReleaseMutex(g_mutex);

                                        if ((hwnd != block_hwnd)
                                            || (wp->hwndInsertAfter != block_behind))
                                        {
                                                vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
                                                               hwnd,
                                                               wp->flags & SWP_NOACTIVATE ? wp->
                                                               hwndInsertAfter : 0, 0);
                                        }
                                }

                                break;
                        }

                case WM_SIZE:
                        if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                break;
                        update_position(hwnd);
                        break;

                case WM_MOVE:
                        if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                break;
                        update_position(hwnd);
                        break;

                case WM_DESTROY:
                        if (!(style & WS_VISIBLE))
                                break;
                        vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
                        break;

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
}

static LRESULT CALLBACK
wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd, parent;
        UINT msg;
        WPARAM wparam;
        LPARAM lparam;

        LONG style;

        if (code < 0)
                goto end;

        hwnd = ((CWPRETSTRUCT *) details)->hwnd;
        msg = ((CWPRETSTRUCT *) details)->message;
        wparam = ((CWPRETSTRUCT *) details)->wParam;
        lparam = ((CWPRETSTRUCT *) details)->lParam;

        style = GetWindowLong(hwnd, GWL_STYLE);

        /* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
           but they exist nonetheless. */
        if ((style & WS_CHILD) && !(style & WS_POPUP))
                goto end;

        if (style & WS_POPUP)
        {
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
                if (!parent)
                        parent = (HWND) - 1;
        }
        else
                parent = NULL;

        switch (msg)
        {
                case WM_SETTEXT:
                        {
                                unsigned short title[150];
                                if (!(style & WS_VISIBLE))
                                        break;
                                /* We cannot use the string in lparam because
                                   we need unicode. */
                                GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
                                vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
                                               vchannel_strfilter_unicode(title), 0);
                                break;
                        }

                default:
                        break;
        }

        if (msg == g_wm_seamless_focus)
        {
                /* FIXME: SetActiveWindow() kills menus. Need to find a clean
                   way to solve this. */
                if ((GetActiveWindow() != hwnd) && !parent)
                        SetActiveWindow(hwnd);
        }

      end:
        return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
}

static LRESULT CALLBACK
cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
{
        if (code < 0)
                goto end;

        switch (code)
        {
                case HCBT_MINMAX:
                        {
                                int show, state, blocked;

                                WaitForSingleObject(g_mutex, INFINITE);
                                blocked = g_blocked_state;
                                ReleaseMutex(g_mutex);

                                show = LOWORD(lparam);

                                if ((show == SW_NORMAL) || (show == SW_SHOWNORMAL)
                                    || (show == SW_RESTORE))
                                        state = 0;
                                else if ((show == SW_MINIMIZE) || (show == SW_SHOWMINIMIZED))
                                        state = 1;
                                else if ((show == SW_MAXIMIZE) || (show == SW_SHOWMAXIMIZED))
                                        state = 2;
                                else
                                {
                                        debug("Unexpected show: %d", show);
                                        break;
                                }

                                if (blocked != state)
                                        vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state,
                                                       0);

                                break;
                        }

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
}

DLL_EXPORT void
SetHooks(void)
{
        if (!g_cbt_hook)
                g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);

        if (!g_wndproc_hook)
                g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);

        if (!g_wndprocret_hook)
                g_wndprocret_hook =
                        SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
}

DLL_EXPORT void
RemoveHooks(void)
{
        if (g_cbt_hook)
                UnhookWindowsHookEx(g_cbt_hook);

        if (g_wndproc_hook)
                UnhookWindowsHookEx(g_wndproc_hook);

        if (g_wndprocret_hook)
                UnhookWindowsHookEx(g_wndprocret_hook);
}

DLL_EXPORT void
SafeMoveWindow(HWND hwnd, int x, int y, int width, int height)
{
        WaitForSingleObject(g_mutex, INFINITE);
        g_block_move.left = x;
        g_block_move.top = y;
        g_block_move.right = x + width;
        g_block_move.bottom = y + height;
        ReleaseMutex(g_mutex);

        SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE | SWP_NOZORDER);

        WaitForSingleObject(g_mutex, INFINITE);
        memset(&g_block_move, 0, sizeof(RECT));
        ReleaseMutex(g_mutex);
}

DLL_EXPORT void
SafeZChange(HWND hwnd, HWND behind)
{
        if (behind == NULL)
                behind = HWND_TOP;

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_zchange[0] = hwnd;
        g_blocked_zchange[1] = behind;
        ReleaseMutex(g_mutex);

        SetWindowPos(hwnd, behind, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_zchange[0] = NULL;
        g_blocked_zchange[1] = NULL;
        ReleaseMutex(g_mutex);
}

DLL_EXPORT void
SafeFocus(HWND hwnd)
{
        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_focus = hwnd;
        ReleaseMutex(g_mutex);

        SendMessage(hwnd, g_wm_seamless_focus, 0, 0);

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_focus = NULL;
        ReleaseMutex(g_mutex);
}

DLL_EXPORT void
SafeSetState(HWND hwnd, int state)
{
        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_state = state;
        ReleaseMutex(g_mutex);

        if (state == 0)
                ShowWindow(hwnd, SW_RESTORE);
        else if (state == 1)
                ShowWindow(hwnd, SW_MINIMIZE);
        else if (state == 2)
                ShowWindow(hwnd, SW_MAXIMIZE);
        else
                debug("Invalid state %d sent.", state);

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_state = -1;
        ReleaseMutex(g_mutex);
}

DLL_EXPORT int
GetInstanceCount()
{
        return g_instance_count;
}

BOOL APIENTRY
DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
{
        switch (ul_reason_for_call)
        {
                case DLL_PROCESS_ATTACH:
                        // remember our instance handle
                        g_instance = hinstDLL;

                        g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
                        if (!g_mutex)
                                return FALSE;

                        WaitForSingleObject(g_mutex, INFINITE);
                        ++g_instance_count;
                        ReleaseMutex(g_mutex);

                        g_wm_seamless_focus = RegisterWindowMessage(FOCUS_MSG_NAME);

                        vchannel_open();

                        break;

                case DLL_THREAD_ATTACH:
                        break;

                case DLL_THREAD_DETACH:
                        break;

                case DLL_PROCESS_DETACH:
                        WaitForSingleObject(g_mutex, INFINITE);
                        --g_instance_count;
                        ReleaseMutex(g_mutex);

                        vchannel_close();

                        CloseHandle(g_mutex);

                        break;
        }

        return TRUE;
}
1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Seamless windows - Remote server hook DLL
4
5	Based on code copyright (C) 2004-2005 Martin Wickett
6
7	Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006
8	Copyright (C) Pierre Ossman <ossman@cendio.se> 2006
9
10	This program is free software; you can redistribute it and/or modify
11	it under the terms of the GNU General Public License as published by
12	the Free Software Foundation; either version 2 of the License, or
13	(at your option) any later version.
14
15	This program is distributed in the hope that it will be useful,
16	but WITHOUT ANY WARRANTY; without even the implied warranty of
17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	GNU General Public License for more details.
19
20	You should have received a copy of the GNU General Public License
21	along with this program; if not, write to the Free Software
22	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23	*/
24
25	#include <stdio.h>
26	#include <stdarg.h>
27
28	#include <windows.h>
29	#include <winuser.h>
30
31	#include "../vchannel.h"
32
33	#define DLL_EXPORT __declspec(dllexport)
34
35	#ifdef __GNUC__
36	#define SHARED __attribute__((section ("SHAREDDATA"), shared))
37	#else
38	#define SHARED
39	#endif
40
41	// Shared DATA
42	#pragma data_seg ( "SHAREDDATA" )
43
44	// this is the total number of processes this dll is currently attached to
45	int g_instance_count SHARED = 0;
46
47	// blocks for locally generated events
48	RECT g_block_move SHARED = { 0, 0, 0, 0 };
49	HWND g_blocked_zchange[2] SHARED = { NULL, NULL };
50	HWND g_blocked_focus SHARED = NULL;
51	int g_blocked_state SHARED = -1;
52
53	#pragma data_seg ()
54
55	#pragma comment(linker, "/section:SHAREDDATA,rws")
56
57	#define FOCUS_MSG_NAME "WM_SEAMLESS_FOCUS"
58	static UINT g_wm_seamless_focus;
59
60	static HHOOK g_cbt_hook = NULL;
61	static HHOOK g_wndproc_hook = NULL;
62	static HHOOK g_wndprocret_hook = NULL;
63
64	static HINSTANCE g_instance = NULL;
65
66	static HANDLE g_mutex = NULL;
67
68	static void
69	update_position(HWND hwnd)
70	{
71	RECT rect, blocked;
72
73	if (!GetWindowRect(hwnd, &rect))
74	{
75	debug("GetWindowRect failed!\n");
76	return;
77	}
78
79	WaitForSingleObject(g_mutex, INFINITE);
80	memcpy(&blocked, &g_block_move, sizeof(RECT));
81	ReleaseMutex(g_mutex);
82
83	if ((rect.left == blocked.left) && (rect.top == blocked.top)
84	&& (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
85	return;
86
87	vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
88	hwnd,
89	rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
90	}
91
92	static LRESULT CALLBACK
93	wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
94	{
95	HWND hwnd, parent;
96	UINT msg;
97	WPARAM wparam;
98	LPARAM lparam;
99
100	LONG style;
101
102	if (code < 0)
103	goto end;
104
105	hwnd = ((CWPSTRUCT *) details)->hwnd;
106	msg = ((CWPSTRUCT *) details)->message;
107	wparam = ((CWPSTRUCT *) details)->wParam;
108	lparam = ((CWPSTRUCT *) details)->lParam;
109
110	style = GetWindowLong(hwnd, GWL_STYLE);
111
112	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
113	but they exist nonetheless. */
114	if ((style & WS_CHILD) && !(style & WS_POPUP))
115	goto end;
116
117	if (style & WS_POPUP)
118	{
119	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
120	if (!parent)
121	parent = (HWND) - 1;
122	}
123	else
124	parent = NULL;
125
126	switch (msg)
127	{
128	case WM_WINDOWPOSCHANGED:
129	{
130	WINDOWPOS wp = (WINDOWPOS ) lparam;
131
132	if (wp->flags & SWP_SHOWWINDOW)
133	{
134	unsigned short title[150];
135	int state;
136
137	vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);
138
139	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
140
141	vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
142	vchannel_strfilter_unicode(title), 0);
143
144	if (style & WS_MAXIMIZE)
145	state = 2;
146	else if (style & WS_MINIMIZE)
147	state = 1;
148	else
149	state = 0;
150
151	update_position(hwnd);
152
153	vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
154	}
155
156	if (wp->flags & SWP_HIDEWINDOW)
157	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
158
159	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
160	break;
161
162	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
163	update_position(hwnd);
164
165	if (!(wp->flags & SWP_NOZORDER))
166	{
167	HWND block_hwnd, block_behind;
168	WaitForSingleObject(g_mutex, INFINITE);
169	block_hwnd = g_blocked_zchange[0];
170	block_behind = g_blocked_zchange[1];
171	ReleaseMutex(g_mutex);
172
173	if ((hwnd != block_hwnd)
174	\|\| (wp->hwndInsertAfter != block_behind))
175	{
176	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
177	hwnd,
178	wp->flags & SWP_NOACTIVATE ? wp->
179	hwndInsertAfter : 0, 0);
180	}
181	}
182
183	break;
184	}
185
186	case WM_SIZE:
187	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
188	break;
189	update_position(hwnd);
190	break;
191
192	case WM_MOVE:
193	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
194	break;
195	update_position(hwnd);
196	break;
197
198	case WM_DESTROY:
199	if (!(style & WS_VISIBLE))
200	break;
201	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
202	break;
203
204	default:
205	break;
206	}
207
208	end:
209	return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
210	}
211
212	static LRESULT CALLBACK
213	wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
214	{
215	HWND hwnd, parent;
216	UINT msg;
217	WPARAM wparam;
218	LPARAM lparam;
219
220	LONG style;
221
222	if (code < 0)
223	goto end;
224
225	hwnd = ((CWPRETSTRUCT *) details)->hwnd;
226	msg = ((CWPRETSTRUCT *) details)->message;
227	wparam = ((CWPRETSTRUCT *) details)->wParam;
228	lparam = ((CWPRETSTRUCT *) details)->lParam;
229
230	style = GetWindowLong(hwnd, GWL_STYLE);
231
232	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
233	but they exist nonetheless. */
234	if ((style & WS_CHILD) && !(style & WS_POPUP))
235	goto end;
236
237	if (style & WS_POPUP)
238	{
239	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
240	if (!parent)
241	parent = (HWND) - 1;
242	}
243	else
244	parent = NULL;
245
246	switch (msg)
247	{
248	case WM_SETTEXT:
249	{
250	unsigned short title[150];
251	if (!(style & WS_VISIBLE))
252	break;
253	/* We cannot use the string in lparam because
254	we need unicode. */
255	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
256	vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
257	vchannel_strfilter_unicode(title), 0);
258	break;
259	}
260
261	default:
262	break;
263	}
264
265	if (msg == g_wm_seamless_focus)
266	{
267	/* FIXME: SetActiveWindow() kills menus. Need to find a clean
268	way to solve this. */
269	if ((GetActiveWindow() != hwnd) && !parent)
270	SetActiveWindow(hwnd);
271	}
272
273	end:
274	return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
275	}
276
277	static LRESULT CALLBACK
278	cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
279	{
280	if (code < 0)
281	goto end;
282
283	switch (code)
284	{
285	case HCBT_MINMAX:
286	{
287	int show, state, blocked;
288
289	WaitForSingleObject(g_mutex, INFINITE);
290	blocked = g_blocked_state;
291	ReleaseMutex(g_mutex);
292
293	show = LOWORD(lparam);
294
295	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
296	\|\| (show == SW_RESTORE))
297	state = 0;
298	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
299	state = 1;
300	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
301	state = 2;
302	else
303	{
304	debug("Unexpected show: %d", show);
305	break;
306	}
307
308	if (blocked != state)
309	vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state,
310	0);
311
312	break;
313	}
314
315	default:
316	break;
317	}
318
319	end:
320	return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
321	}
322
323	DLL_EXPORT void
324	SetHooks(void)
325	{
326	if (!g_cbt_hook)
327	g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
328
329	if (!g_wndproc_hook)
330	g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
331
332	if (!g_wndprocret_hook)
333	g_wndprocret_hook =
334	SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
335	}
336
337	DLL_EXPORT void
338	RemoveHooks(void)
339	{
340	if (g_cbt_hook)
341	UnhookWindowsHookEx(g_cbt_hook);
342
343	if (g_wndproc_hook)
344	UnhookWindowsHookEx(g_wndproc_hook);
345
346	if (g_wndprocret_hook)
347	UnhookWindowsHookEx(g_wndprocret_hook);
348	}
349
350	DLL_EXPORT void
351	SafeMoveWindow(HWND hwnd, int x, int y, int width, int height)
352	{
353	WaitForSingleObject(g_mutex, INFINITE);
354	g_block_move.left = x;
355	g_block_move.top = y;
356	g_block_move.right = x + width;
357	g_block_move.bottom = y + height;
358	ReleaseMutex(g_mutex);
359
360	SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE \| SWP_NOZORDER);
361
362	WaitForSingleObject(g_mutex, INFINITE);
363	memset(&g_block_move, 0, sizeof(RECT));
364	ReleaseMutex(g_mutex);
365	}
366
367	DLL_EXPORT void
368	SafeZChange(HWND hwnd, HWND behind)
369	{
370	if (behind == NULL)
371	behind = HWND_TOP;
372
373	WaitForSingleObject(g_mutex, INFINITE);
374	g_blocked_zchange[0] = hwnd;
375	g_blocked_zchange[1] = behind;
376	ReleaseMutex(g_mutex);
377
378	SetWindowPos(hwnd, behind, 0, 0, 0, 0, SWP_NOACTIVATE \| SWP_NOMOVE \| SWP_NOSIZE);
379
380	WaitForSingleObject(g_mutex, INFINITE);
381	g_blocked_zchange[0] = NULL;
382	g_blocked_zchange[1] = NULL;
383	ReleaseMutex(g_mutex);
384	}
385
386	DLL_EXPORT void
387	SafeFocus(HWND hwnd)
388	{
389	WaitForSingleObject(g_mutex, INFINITE);
390	g_blocked_focus = hwnd;
391	ReleaseMutex(g_mutex);
392
393	SendMessage(hwnd, g_wm_seamless_focus, 0, 0);
394
395	WaitForSingleObject(g_mutex, INFINITE);
396	g_blocked_focus = NULL;
397	ReleaseMutex(g_mutex);
398	}
399
400	DLL_EXPORT void
401	SafeSetState(HWND hwnd, int state)
402	{
403	WaitForSingleObject(g_mutex, INFINITE);
404	g_blocked_state = state;
405	ReleaseMutex(g_mutex);
406
407	if (state == 0)
408	ShowWindow(hwnd, SW_RESTORE);
409	else if (state == 1)
410	ShowWindow(hwnd, SW_MINIMIZE);
411	else if (state == 2)
412	ShowWindow(hwnd, SW_MAXIMIZE);
413	else
414	debug("Invalid state %d sent.", state);
415
416	WaitForSingleObject(g_mutex, INFINITE);
417	g_blocked_state = -1;
418	ReleaseMutex(g_mutex);
419	}
420
421	DLL_EXPORT int
422	GetInstanceCount()
423	{
424	return g_instance_count;
425	}
426
427	BOOL APIENTRY
428	DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
429	{
430	switch (ul_reason_for_call)
431	{
432	case DLL_PROCESS_ATTACH:
433	// remember our instance handle
434	g_instance = hinstDLL;
435
436	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
437	if (!g_mutex)
438	return FALSE;
439
440	WaitForSingleObject(g_mutex, INFINITE);
441	++g_instance_count;
442	ReleaseMutex(g_mutex);
443
444	g_wm_seamless_focus = RegisterWindowMessage(FOCUS_MSG_NAME);
445
446	vchannel_open();
447
448	break;
449
450	case DLL_THREAD_ATTACH:
451	break;
452
453	case DLL_THREAD_DETACH:
454	break;
455
456	case DLL_PROCESS_DETACH:
457	WaitForSingleObject(g_mutex, INFINITE);
458	--g_instance_count;
459	ReleaseMutex(g_mutex);
460
461	vchannel_close();
462
463	CloseHandle(g_mutex);
464
465	break;
466	}
467
468	return TRUE;
469	}