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 };

#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))
                                {
                                        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;

        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)
                SetFocus(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;

                                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;
                                }
                                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 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	ossman_	1071	/* -- c-basic-offset: 8 --
2			rdesktop: A Remote Desktop Protocol client.
3			Seamless windows - Remote server hook DLL
4	ossman_	1069
5	ossman_	1071	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	ossman_	1069	#include <stdio.h>
26			#include <stdarg.h>
27
28	ossman_	1071	#include <windows.h>
29			#include <winuser.h>
30	ossman_	1069
31	ossman_	1073	#include "../vchannel.h"
32	ossman_	1071
33	ossman_	1069	#define DLL_EXPORT __declspec(dllexport)
34
35	ossman_	1145	#ifdef __GNUC__
36			#define SHARED __attribute__((section ("SHAREDDATA"), shared))
37			#else
38			#define SHARED
39			#endif
40
41	ossman_	1069	// Shared DATA
42			#pragma data_seg ( "SHAREDDATA" )
43
44			// this is the total number of processes this dll is currently attached to
45	ossman_	1145	int g_instance_count SHARED = 0;
46	ossman_	1069
47	ossman_	1145	// blocks for locally generated events
48			RECT g_block_move SHARED = { 0, 0, 0, 0 };
49
50	ossman_	1069	#pragma data_seg ()
51
52			#pragma comment(linker, "/section:SHAREDDATA,rws")
53
54	ossman_	1153	#define FOCUS_MSG_NAME "WM_SEAMLESS_FOCUS"
55			static UINT g_wm_seamless_focus;
56
57	ossman_	1071	static HHOOK g_cbt_hook = NULL;
58			static HHOOK g_wndproc_hook = NULL;
59	ossman_	1134	static HHOOK g_wndprocret_hook = NULL;
60	ossman_	1069
61	ossman_	1071	static HINSTANCE g_instance = NULL;
62	ossman_	1069
63	ossman_	1071	static HANDLE g_mutex = NULL;
64	ossman_	1069
65	ossman_	1081	static void
66			update_position(HWND hwnd)
67			{
68	ossman_	1145	RECT rect, blocked;
69	ossman_	1081
70			if (!GetWindowRect(hwnd, &rect))
71			{
72			debug("GetWindowRect failed!\n");
73			return;
74			}
75
76	ossman_	1145	WaitForSingleObject(g_mutex, INFINITE);
77			memcpy(&blocked, &g_block_move, sizeof(RECT));
78			ReleaseMutex(g_mutex);
79
80			if ((rect.left == blocked.left) && (rect.top == blocked.top)
81			&& (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
82			return;
83
84	astrand	1091	vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
85	ossman_	1081	hwnd,
86			rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
87			}
88
89	ossman_	1071	static LRESULT CALLBACK
90			wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
91	ossman_	1069	{
92	ossman_	1097	HWND hwnd, parent;
93	ossman_	1079	UINT msg;
94			WPARAM wparam;
95			LPARAM lparam;
96	ossman_	1069
97	ossman_	1079	LONG style;
98	ossman_	1069
99	ossman_	1071	if (code < 0)
100			goto end;
101	ossman_	1069
102	ossman_	1079	hwnd = ((CWPSTRUCT *) details)->hwnd;
103			msg = ((CWPSTRUCT *) details)->message;
104			wparam = ((CWPSTRUCT *) details)->wParam;
105			lparam = ((CWPSTRUCT *) details)->lParam;
106
107			style = GetWindowLong(hwnd, GWL_STYLE);
108
109	ossman_	1082	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
110			but they exist nonetheless. */
111			if ((style & WS_CHILD) && !(style & WS_POPUP))
112	ossman_	1079	goto end;
113
114	ossman_	1097	if (style & WS_POPUP)
115	ossman_	1109	{
116	ossman_	1097	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
117	ossman_	1109	if (!parent)
118			parent = (HWND) - 1;
119			}
120	ossman_	1097	else
121			parent = NULL;
122
123	ossman_	1071	switch (msg)
124			{
125	ossman_	1069
126	ossman_	1071	case WM_WINDOWPOSCHANGED:
127	ossman_	1079	{
128			WINDOWPOS wp = (WINDOWPOS ) lparam;
129	ossman_	1069
130	ossman_	1079	if (wp->flags & SWP_SHOWWINDOW)
131			{
132	ossman_	1134	unsigned short title[150];
133	ossman_	1099	int state;
134
135	ossman_	1097	vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);
136	ossman_	1069
137	ossman_	1134	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
138	ossman_	1069
139	ossman_	1113	vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
140	ossman_	1134	vchannel_strfilter_unicode(title), 0);
141	ossman_	1099
142			if (style & WS_MAXIMIZE)
143			state = 2;
144			else if (style & WS_MINIMIZE)
145			state = 1;
146			else
147			state = 0;
148
149	ossman_	1081	update_position(hwnd);
150	ossman_	1099
151	ossman_	1131	vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
152	ossman_	1079	}
153	ossman_	1069
154	ossman_	1079	if (wp->flags & SWP_HIDEWINDOW)
155	astrand	1091	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
156	ossman_	1079
157	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
158	ossman_	1079	break;
159
160	ossman_	1080	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
161	ossman_	1081	update_position(hwnd);
162	ossman_	1079
163			if (!(wp->flags & SWP_NOZORDER))
164	ossman_	1080	{
165	astrand	1091	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
166	ossman_	1079	hwnd,
167			wp->flags & SWP_NOACTIVATE ? wp->
168			hwndInsertAfter : 0, 0);
169	ossman_	1080	}
170	ossman_	1069
171	ossman_	1071	break;
172	ossman_	1079	}
173	ossman_	1069
174	ossman_	1081	case WM_SIZE:
175	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
176	ossman_	1083	break;
177	ossman_	1081	update_position(hwnd);
178			break;
179
180			case WM_MOVE:
181	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
182	ossman_	1083	break;
183	ossman_	1081	update_position(hwnd);
184			break;
185
186	ossman_	1134	case WM_DESTROY:
187			if (!(style & WS_VISIBLE))
188			break;
189			vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
190			break;
191
192			default:
193			break;
194			}
195
196			end:
197			return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
198			}
199
200			static LRESULT CALLBACK
201			wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
202			{
203			HWND hwnd, parent;
204			UINT msg;
205			WPARAM wparam;
206			LPARAM lparam;
207
208			LONG style;
209
210			if (code < 0)
211			goto end;
212
213			hwnd = ((CWPRETSTRUCT *) details)->hwnd;
214			msg = ((CWPRETSTRUCT *) details)->message;
215			wparam = ((CWPRETSTRUCT *) details)->wParam;
216			lparam = ((CWPRETSTRUCT *) details)->lParam;
217
218			style = GetWindowLong(hwnd, GWL_STYLE);
219
220			/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
221			but they exist nonetheless. */
222			if ((style & WS_CHILD) && !(style & WS_POPUP))
223			goto end;
224
225			switch (msg)
226			{
227	ossman_	1102	case WM_SETTEXT:
228	ossman_	1113	{
229	ossman_	1134	unsigned short title[150];
230	ossman_	1113	if (!(style & WS_VISIBLE))
231			break;
232	ossman_	1134	/* We cannot use the string in lparam because
233			we need unicode. */
234			GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
235	ossman_	1113	vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
236	ossman_	1134	vchannel_strfilter_unicode(title), 0);
237	ossman_	1102	break;
238	ossman_	1113	}
239	ossman_	1102
240	ossman_	1071	default:
241			break;
242			}
243
244	ossman_	1153	if (msg == g_wm_seamless_focus)
245			SetFocus(hwnd);
246
247	ossman_	1071	end:
248	ossman_	1134	return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
249	ossman_	1069	}
250
251	ossman_	1071	static LRESULT CALLBACK
252			cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
253	ossman_	1069	{
254	ossman_	1071	if (code < 0)
255			goto end;
256	ossman_	1069
257	ossman_	1071	switch (code)
258			{
259			case HCBT_MINMAX:
260			{
261	ossman_	1079	int show, state;
262	ossman_	1069
263	ossman_	1071	show = LOWORD(lparam);
264	ossman_	1069
265	ossman_	1128	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
266			\|\| (show == SW_RESTORE))
267	ossman_	1079	state = 0;
268	ossman_	1106	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
269	ossman_	1079	state = 1;
270	ossman_	1106	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
271	ossman_	1079	state = 2;
272	ossman_	1100	else
273	ossman_	1106	{
274			debug("Unexpected show: %d", show);
275	ossman_	1100	break;
276	ossman_	1106	}
277	ossman_	1096	vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state, 0);
278	ossman_	1071	break;
279			}
280	ossman_	1069
281	ossman_	1071	default:
282			break;
283			}
284	ossman_	1069
285	ossman_	1071	end:
286			return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
287	ossman_	1069	}
288
289	ossman_	1071	DLL_EXPORT void
290			SetHooks(void)
291	ossman_	1069	{
292	ossman_	1071	if (!g_cbt_hook)
293			g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
294	ossman_	1069
295	ossman_	1071	if (!g_wndproc_hook)
296			g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
297	ossman_	1134
298			if (!g_wndprocret_hook)
299			g_wndprocret_hook =
300			SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
301	ossman_	1069	}
302
303	ossman_	1071	DLL_EXPORT void
304			RemoveHooks(void)
305	ossman_	1069	{
306	ossman_	1071	if (g_cbt_hook)
307			UnhookWindowsHookEx(g_cbt_hook);
308	ossman_	1069
309	ossman_	1071	if (g_wndproc_hook)
310			UnhookWindowsHookEx(g_wndproc_hook);
311	ossman_	1134
312			if (g_wndprocret_hook)
313			UnhookWindowsHookEx(g_wndprocret_hook);
314	ossman_	1069	}
315
316	ossman_	1145	DLL_EXPORT void
317			SafeMoveWindow(HWND hwnd, int x, int y, int width, int height)
318			{
319			WaitForSingleObject(g_mutex, INFINITE);
320			g_block_move.left = x;
321			g_block_move.top = y;
322			g_block_move.right = x + width;
323			g_block_move.bottom = y + height;
324			ReleaseMutex(g_mutex);
325
326			SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE \| SWP_NOZORDER);
327
328			WaitForSingleObject(g_mutex, INFINITE);
329			memset(&g_block_move, 0, sizeof(RECT));
330			ReleaseMutex(g_mutex);
331			}
332
333	ossman_	1071	DLL_EXPORT int
334			GetInstanceCount()
335	ossman_	1069	{
336	ossman_	1071	return g_instance_count;
337	ossman_	1069	}
338
339	ossman_	1071	BOOL APIENTRY
340			DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
341	ossman_	1069	{
342	ossman_	1071	switch (ul_reason_for_call)
343			{
344			case DLL_PROCESS_ATTACH:
345			// remember our instance handle
346			g_instance = hinstDLL;
347	ossman_	1069
348	ossman_	1073	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
349	ossman_	1071	if (!g_mutex)
350			return FALSE;
351	ossman_	1069
352	ossman_	1071	WaitForSingleObject(g_mutex, INFINITE);
353			++g_instance_count;
354			ReleaseMutex(g_mutex);
355	ossman_	1069
356	ossman_	1153	g_wm_seamless_focus = RegisterWindowMessage(FOCUS_MSG_NAME);
357
358	ossman_	1071	vchannel_open();
359	ossman_	1069
360	ossman_	1071	break;
361	ossman_	1069
362	ossman_	1071	case DLL_THREAD_ATTACH:
363			break;
364	ossman_	1069
365	ossman_	1071	case DLL_THREAD_DETACH:
366			break;
367	ossman_	1069
368	ossman_	1071	case DLL_PROCESS_DETACH:
369			WaitForSingleObject(g_mutex, INFINITE);
370			--g_instance_count;
371			ReleaseMutex(g_mutex);
372	ossman_	1069
373	ossman_	1071	vchannel_close();
374	ossman_	1069
375	ossman_	1071	CloseHandle(g_mutex);
376	ossman_	1069
377	ossman_	1071	break;
378			}
379	ossman_	1069
380	ossman_	1071	return TRUE;
381	ossman_	1069	}