dlls/user/hook.c

   1 /*
   2  * Windows hook functions
   3  *
   4  * Copyright 2002 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * NOTES:
  21  *   Status of the various hooks:
  22  *     WH_MSGFILTER                 OK
  23  *     WH_JOURNALRECORD             Partially implemented
  24  *     WH_JOURNALPLAYBACK           Partially implemented
  25  *     WH_KEYBOARD                  OK
  26  *     WH_GETMESSAGE                OK (FIXME: A/W mapping?)
  27  *     WH_CALLWNDPROC               OK (FIXME: A/W mapping?)
  28  *     WH_CBT
  29  *       HCBT_MOVESIZE              OK
  30  *       HCBT_MINMAX                OK
  31  *       HCBT_QS                    OK
  32  *       HCBT_CREATEWND             OK
  33  *       HCBT_DESTROYWND            OK
  34  *       HCBT_ACTIVATE              OK
  35  *       HCBT_CLICKSKIPPED          OK
  36  *       HCBT_KEYSKIPPED            OK
  37  *       HCBT_SYSCOMMAND            Not implemented
  38  *       HCBT_SETFOCUS              OK
  39  *     WH_SYSMSGFILTER              OK
  40  *     WH_MOUSE                     OK
  41  *     WH_HARDWARE                  Not supported in Win32
  42  *     WH_DEBUG                     Not implemented
  43  *     WH_SHELL
  44  *       HSHELL_WINDOWCREATED       OK
  45  *       HSHELL_WINDOWDESTROYED     OK
  46  *       HSHELL_ACTIVATESHELLWINDOW Not implemented
  47  *       HSHELL_WINDOWACTIVATED     Not implemented
  48  *       HSHELL_GETMINRECT          Not implemented
  49  *       HSHELL_REDRAW              Not implemented
  50  *       HSHELL_TASKMAN             Not implemented
  51  *       HSHELL_LANGUAGE            Not implemented
  52  *       HSHELL_SYSMENU             Not implemented
  53  *       HSHELL_ENDTASK             Not implemented
  54  *       HSHELL_ACCESSIBILITYSTATE  Not implemented
  55  *       HSHELL_APPCOMMAND          Not implemented
  56  *       HSHELL_WINDOWREPLACED      Not implemented
  57  *       HSHELL_WINDOWREPLACING     Not implemented
  58  *     WH_FOREGROUNDIDLE            Not implemented
  59  *     WH_CALLWNDPROCRET            OK (FIXME: A/W mapping?)
  60  *     WH_KEYBOARD_LL               Implemented but should use SendMessage instead
  61  *     WH_MOUSE_LL                  Implemented but should use SendMessage instead
  62  */
  63
  64 #include <stdarg.h>
  65
  66 #include "windef.h"
  67 #include "winbase.h"
  68 #include "winuser.h"
  69 #include "winerror.h"
  70 #include "heap.h"
  71 #include "message.h"
  72 #include "win.h"
  73 #include "wine/server.h"
  74 #include "wine/unicode.h"
  75 #include "wine/debug.h"
  76 #include "winternl.h"
  77
  78 WINE_DEFAULT_DEBUG_CHANNEL(hook);
  79 WINE_DECLARE_DEBUG_CHANNEL(relay);
  80
  81 static const char * const hook_names[WH_MAXHOOK - WH_MINHOOK + 1] =
  82 {
  83     "WH_MSGFILTER",
  84     "WH_JOURNALRECORD",
  85     "WH_JOURNALPLAYBACK",
  86     "WH_KEYBOARD",
  87     "WH_GETMESSAGE",
  88     "WH_CALLWNDPROC",
  89     "WH_CBT",
  90     "WH_SYSMSGFILTER",
  91     "WH_MOUSE",
  92     "WH_HARDWARE",
  93     "WH_DEBUG",
  94     "WH_SHELL",
  95     "WH_FOREGROUNDIDLE",
  96     "WH_CALLWNDPROCRET",
  97     "WH_KEYBOARD_LL",
  98     "WH_MOUSE_LL"
  99 };
 100
 101
 102 /***********************************************************************
 103  *              get_ll_hook_timeout
 104  *
 105  */
 106 static UINT get_ll_hook_timeout(void)
 107 {
 108     /* FIXME: should retrieve LowLevelHooksTimeout in HKEY_CURRENT_USER\Control Panel\Desktop */
 109     return 2000;
 110 }
 111
 112
 113 /***********************************************************************
 114  *              set_windows_hook
 115  *
 116  * Implementation of SetWindowsHookExA and SetWindowsHookExW.
 117  */
 118 static HHOOK set_windows_hook( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid, BOOL unicode )
 119 {
 120     HHOOK handle = 0;
 121     WCHAR module[MAX_PATH];
 122
 123     if (tid)  /* thread-local hook */
 124     {
 125         if (id == WH_JOURNALRECORD ||
 126             id == WH_JOURNALPLAYBACK ||
 127             id == WH_KEYBOARD_LL ||
 128             id == WH_MOUSE_LL ||
 129             id == WH_SYSMSGFILTER)
 130         {
 131             /* these can only be global */
 132             SetLastError( ERROR_INVALID_PARAMETER );
 133             return 0;
 134         }
 135         inst = 0;
 136     }
 137     else  /* system-global hook */
 138     {
 139         if (id == WH_KEYBOARD_LL || id == WH_MOUSE_LL) inst = 0;
 140         else if (!inst || !GetModuleFileNameW( inst, module, MAX_PATH ))
 141         {
 142             SetLastError( ERROR_INVALID_PARAMETER );
 143             return 0;
 144         }
 145     }
 146
 147     SERVER_START_REQ( set_hook )
 148     {
 149         req->id      = id;
 150         req->tid     = tid;
 151         req->unicode = unicode;
 152         if (inst) /* make proc relative to the module base */
 153         {
 154             req->proc = (void *)((char *)proc - (char *)inst);
 155             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 156         }
 157         else req->proc = proc;
 158
 159         if (!wine_server_call_err( req )) handle = reply->handle;
 160     }
 161     SERVER_END_REQ;
 162
 163     TRACE( "%s %p %lx -> %p\n", hook_names[id-WH_MINHOOK], proc, tid, handle );
 164     return handle;
 165 }
 166
 167
 168 /***********************************************************************
 169  *              call_hook_AtoW
 170  */
 171 static LRESULT call_hook_AtoW( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 172 {
 173     LRESULT ret;
 174     UNICODE_STRING usBuffer;
 175     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 176     else
 177     {
 178         CBT_CREATEWNDA *cbtcwA = (CBT_CREATEWNDA *)lparam;
 179         CBT_CREATEWNDW cbtcwW;
 180         CREATESTRUCTW csW;
 181
 182         cbtcwW.lpcs = &csW;
 183         cbtcwW.hwndInsertAfter = cbtcwA->hwndInsertAfter;
 184         csW = *(CREATESTRUCTW *)cbtcwA->lpcs;
 185
 186         if (HIWORD(cbtcwA->lpcs->lpszName))
 187         {
 188             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszName);
 189             csW.lpszName = usBuffer.Buffer;
 190         }
 191         if (HIWORD(cbtcwA->lpcs->lpszClass))
 192         {
 193             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszName);
 194             csW.lpszClass = usBuffer.Buffer;
 195         }
 196         ret = proc( code, wparam, (LPARAM)&cbtcwW );
 197         cbtcwA->hwndInsertAfter = cbtcwW.hwndInsertAfter;
 198         if (HIWORD(csW.lpszName)) HeapFree( GetProcessHeap(), 0, (LPWSTR)csW.lpszName );
 199         if (HIWORD(csW.lpszClass)) HeapFree( GetProcessHeap(), 0, (LPWSTR)csW.lpszClass );
 200     }
 201     return ret;
 202 }
 203
 204
 205 /***********************************************************************
 206  *              call_hook_WtoA
 207  */
 208 static LRESULT call_hook_WtoA( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 209 {
 210     LRESULT ret;
 211
 212     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 213     else
 214     {
 215         CBT_CREATEWNDW *cbtcwW = (CBT_CREATEWNDW *)lparam;
 216         CBT_CREATEWNDA cbtcwA;
 217         CREATESTRUCTA csA;
 218
 219         cbtcwA.lpcs = &csA;
 220         cbtcwA.hwndInsertAfter = cbtcwW->hwndInsertAfter;
 221         csA = *(CREATESTRUCTA *)cbtcwW->lpcs;
 222
 223         if (HIWORD(cbtcwW->lpcs->lpszName))
 224             csA.lpszName = HEAP_strdupWtoA( GetProcessHeap(), 0, cbtcwW->lpcs->lpszName );
 225         if (HIWORD(cbtcwW->lpcs->lpszClass))
 226             csA.lpszClass = HEAP_strdupWtoA( GetProcessHeap(), 0, cbtcwW->lpcs->lpszClass );
 227         ret = proc( code, wparam, (LPARAM)&cbtcwA );
 228         cbtcwW->hwndInsertAfter = cbtcwA.hwndInsertAfter;
 229         if (HIWORD(csA.lpszName)) HeapFree( GetProcessHeap(), 0, (LPSTR)csA.lpszName );
 230         if (HIWORD(csA.lpszClass)) HeapFree( GetProcessHeap(), 0, (LPSTR)csA.lpszClass );
 231     }
 232     return ret;
 233 }
 234
 235
 236 /***********************************************************************
 237  *              call_hook
 238  */
 239 static LRESULT call_hook( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam,
 240                           BOOL prev_unicode, BOOL next_unicode )
 241 {
 242     LRESULT ret;
 243
 244     if (TRACE_ON(relay))
 245         DPRINTF( "%04lx:Call hook proc %p (id=%s,code=%x,wp=%08x,lp=%08lx)\n",
 246                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 247
 248     if (!prev_unicode == !next_unicode) ret = proc( code, wparam, lparam );
 249     else if (prev_unicode) ret = call_hook_WtoA( proc, id, code, wparam, lparam );
 250     else ret = call_hook_AtoW( proc, id, code, wparam, lparam );
 251
 252     if (TRACE_ON(relay))
 253         DPRINTF( "%04lx:Ret  hook proc %p (id=%s,code=%x,wp=%08x,lp=%08lx) retval=%08lx\n",
 254                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, ret );
 255
 256     return ret;
 257 }
 258
 259
 260 /***********************************************************************
 261  *              get_hook_proc
 262  *
 263  * Retrieve the hook procedure real value for a module-relative proc
 264  */
 265 static HOOKPROC get_hook_proc( HOOKPROC proc, const WCHAR *module )
 266 {
 267     HMODULE mod;
 268
 269     if (!(mod = GetModuleHandleW(module)))
 270     {
 271         TRACE( "loading %s\n", debugstr_w(module) );
 272         /* FIXME: the library will never be freed */
 273         if (!(mod = LoadLibraryW(module))) return NULL;
 274     }
 275     return (HOOKPROC)((char *)mod + (ULONG_PTR)proc);
 276 }
 277
 278
 279 /***********************************************************************
 280  *              HOOK_CallHooks
 281  */
 282 LRESULT HOOK_CallHooks( INT id, INT code, WPARAM wparam, LPARAM lparam, BOOL unicode )
 283 {
 284     MESSAGEQUEUE *queue = QUEUE_Current();
 285     HOOKPROC proc = NULL;
 286     HHOOK handle = 0;
 287     DWORD pid = 0, tid = 0;
 288     WCHAR module[MAX_PATH];
 289     BOOL unicode_hook = FALSE;
 290     LRESULT ret = 0;
 291
 292     if (!queue) return 0;
 293     SERVER_START_REQ( start_hook_chain )
 294     {
 295         req->id = id;
 296         wine_server_set_reply( req, module, sizeof(module)-sizeof(WCHAR) );
 297         if (!wine_server_call( req ))
 298         {
 299             module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 300             handle       = reply->handle;
 301             proc         = reply->proc;
 302             pid          = reply->pid;
 303             tid          = reply->tid;
 304             unicode_hook = reply->unicode;
 305         }
 306     }
 307     SERVER_END_REQ;
 308
 309     if (tid)
 310     {
 311         TRACE( "calling hook in thread %04lx %s code %x wp %x lp %lx\n",
 312                tid, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 313
 314         switch(id)
 315         {
 316         case WH_KEYBOARD_LL:
 317             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_KEYBOARD_LL_HOOK, wparam, lparam,
 318                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 319             break;
 320         case WH_MOUSE_LL:
 321             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_MOUSE_LL_HOOK, wparam, lparam,
 322                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 323             break;
 324         }
 325     }
 326     else if (proc)
 327     {
 328         TRACE( "calling hook %p %s code %x wp %x lp %lx module %s\n",
 329                proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, debugstr_w(module) );
 330
 331         if (!module[0] || (proc = get_hook_proc( proc, module )) != NULL)
 332         {
 333             int locks = WIN_SuspendWndsLock();
 334             HHOOK prev = queue->hook;
 335             queue->hook = handle;
 336             ret = call_hook( proc, id, code, wparam, lparam, unicode, unicode_hook );
 337             queue->hook = prev;
 338             WIN_RestoreWndsLock( locks );
 339         }
 340
 341     }
 342     else return 0;
 343
 344     SERVER_START_REQ( finish_hook_chain )
 345     {
 346         req->id = id;
 347         wine_server_call( req );
 348     }
 349     SERVER_END_REQ;
 350     return ret;
 351 }
 352
 353
 354 /***********************************************************************
 355  *           HOOK_IsHooked
 356  */
 357 BOOL HOOK_IsHooked( INT id )
 358 {
 359     return TRUE;  /* FIXME */
 360 }
 361
 362
 363 /***********************************************************************
 364  *              SetWindowsHookA (USER32.@)
 365  */
 366 HHOOK WINAPI SetWindowsHookA( INT id, HOOKPROC proc )
 367 {
 368     return SetWindowsHookExA( id, proc, 0, GetCurrentThreadId() );
 369 }
 370
 371
 372 /***********************************************************************
 373  *              SetWindowsHookW (USER32.@)
 374  */
 375 HHOOK WINAPI SetWindowsHookW( INT id, HOOKPROC proc )
 376 {
 377     return SetWindowsHookExW( id, proc, 0, GetCurrentThreadId() );
 378 }
 379
 380
 381 /***********************************************************************
 382  *              SetWindowsHookExA (USER32.@)
 383  */
 384 HHOOK WINAPI SetWindowsHookExA( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 385 {
 386     return set_windows_hook( id, proc, inst, tid, FALSE );
 387 }
 388
 389 /***********************************************************************
 390  *              SetWindowsHookExW (USER32.@)
 391  */
 392 HHOOK WINAPI SetWindowsHookExW( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 393 {
 394     return set_windows_hook( id, proc, inst, tid, TRUE );
 395 }
 396
 397
 398 /***********************************************************************
 399  *              UnhookWindowsHook (USER32.@)
 400  */
 401 BOOL WINAPI UnhookWindowsHook( INT id, HOOKPROC proc )
 402 {
 403     BOOL ret;
 404
 405     TRACE( "%s %p\n", hook_names[id-WH_MINHOOK], proc );
 406
 407     SERVER_START_REQ( remove_hook )
 408     {
 409         req->handle = 0;
 410         req->id   = id;
 411         req->proc = proc;
 412         ret = !wine_server_call_err( req );
 413     }
 414     SERVER_END_REQ;
 415     return ret;
 416 }
 417
 418
 419
 420 /***********************************************************************
 421  *              UnhookWindowsHookEx (USER32.@)
 422  */
 423 BOOL WINAPI UnhookWindowsHookEx( HHOOK hhook )
 424 {
 425     BOOL ret;
 426
 427     TRACE( "%p\n", hhook );
 428
 429     SERVER_START_REQ( remove_hook )
 430     {
 431         req->handle = hhook;
 432         ret = !wine_server_call_err( req );
 433     }
 434     SERVER_END_REQ;
 435     return ret;
 436 }
 437
 438
 439 /***********************************************************************
 440  *              CallNextHookEx (USER32.@)
 441  */
 442 LRESULT WINAPI CallNextHookEx( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 443 {
 444     MESSAGEQUEUE *queue = QUEUE_Current();
 445     HOOKPROC proc = NULL;
 446     WCHAR module[MAX_PATH];
 447     HHOOK handle = 0;
 448     DWORD pid = 0, tid = 0;
 449     INT id = 0;
 450     BOOL prev_unicode = FALSE, next_unicode = FALSE;
 451     LRESULT ret = 0;
 452
 453     if (!queue) return 0;
 454
 455     SERVER_START_REQ( get_next_hook )
 456     {
 457         req->handle = queue->hook;
 458         wine_server_set_reply( req, module, sizeof(module)-sizeof(WCHAR) );
 459         if (!wine_server_call_err( req ))
 460         {
 461             module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 462             handle       = reply->next;
 463             id           = reply->id;
 464             pid          = reply->pid;
 465             tid          = reply->tid;
 466             proc         = reply->proc;
 467             prev_unicode = reply->prev_unicode;
 468             next_unicode = reply->next_unicode;
 469         }
 470     }
 471     SERVER_END_REQ;
 472
 473     if (tid)
 474     {
 475         TRACE( "calling hook in thread %04lx %s code %x wp %x lp %lx\n",
 476                tid, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 477
 478         switch(id)
 479         {
 480         case WH_KEYBOARD_LL:
 481             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_KEYBOARD_LL_HOOK, wparam, lparam,
 482                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 483             break;
 484         case WH_MOUSE_LL:
 485             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_MOUSE_LL_HOOK, wparam, lparam,
 486                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 487             break;
 488         }
 489     }
 490     else if (proc)
 491     {
 492         TRACE( "calling hook %p %s code %x wp %x lp %lx module %s\n",
 493                proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, debugstr_w(module) );
 494
 495         if (!module[0] || (proc = get_hook_proc( proc, module )) != NULL)
 496         {
 497             HHOOK prev = queue->hook;
 498             queue->hook = handle;
 499             ret = call_hook( proc, id, code, wparam, lparam, prev_unicode, next_unicode );
 500             queue->hook = prev;
 501         }
 502     }
 503     return ret;
 504 }
 505
 506
 507 /***********************************************************************
 508  *              CallMsgFilterA (USER32.@)
 509  */
 510 BOOL WINAPI CallMsgFilterA( LPMSG msg, INT code )
 511 {
 512     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, FALSE )) return TRUE;
 513     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, FALSE );
 514 }
 515
 516
 517 /***********************************************************************
 518  *              CallMsgFilterW (USER32.@)
 519  */
 520 BOOL WINAPI CallMsgFilterW( LPMSG msg, INT code )
 521 {
 522     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, TRUE )) return TRUE;
 523     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, TRUE );
 524 }
 525
 526
 527 /***********************************************************************
 528  *           SetWinEventHook                            [USER32.@]
 529  *
 530  * Set up an event hook for a set of events.
 531  *
 532  * PARAMS
 533  *  dwMin     [I] Lowest event handled by pfnProc
 534  *  dwMax     [I] Highest event handled by pfnProc
 535  *  hModule   [I] DLL containing pfnProc
 536  *  pfnProc   [I] Callback event hook function
 537  *  dwProcess [I] Process to get events from, or 0 for all processes
 538  *  dwThread  [I] Thread to get events from, or 0 for all threads
 539  *  dwFlags   [I] Flags indicating the status of pfnProc
 540  *
 541  * RETURNS
 542  *  Success: A handle representing the hook.
 543  *  Failure: A NULL handle.
 544  *
 545  * BUGS
 546  *  Not implemented.
 547  */
 548 HWINEVENTHOOK WINAPI SetWinEventHook(DWORD dwMin, DWORD dwMax, HMODULE hModule,
 549                                      WINEVENTPROC pfnProc, DWORD dwProcess,
 550                                      DWORD dwThread, DWORD dwFlags)
 551 {
 552     FIXME("(%ld,%ld,%p,%p,%ld,%ld,0x%08lx)-stub!\n", dwMin, dwMax, hModule,
 553           pfnProc, dwProcess, dwThread, dwFlags);
 554     return 0;
 555 }
 556
 557
 558 /***********************************************************************
 559  *           UnhookWinEvent                             [USER32.@]
 560  *
 561  * Remove an event hook for a set of events.
 562  *
 563  * PARAMS
 564  *  hEventHook [I] Event hook to remove
 565  *
 566  * RETURNS
 567  *  Success: TRUE. The event hook has been removed.
 568  *  Failure: FALSE, if hEventHook is invalid.
 569  *
 570  * BUGS
 571  *  Not implemented.
 572  */
 573 BOOL WINAPI UnhookWinEvent(HWINEVENTHOOK hEventHook)
 574 {
 575     FIXME("(%p)-stub!\n", hEventHook);
 576
 577     return (hEventHook != 0);
 578 }
 579
 580
 581 /***********************************************************************
 582  *           NotifyWinEvent                             [USER32.@]
 583  *
 584  * Inform the OS that an event has occurred.
 585  *
 586  * PARAMS
 587  *  dwEvent  [I] Id of the event
 588  *  hWnd     [I] Window holding the object that created the event
 589  *  nId      [I] Type of object that created the event
 590  *  nChildId [I] Child object of nId, or CHILDID_SELF.
 591  *
 592  * RETURNS
 593  *  Nothing.
 594  *
 595  * BUGS
 596  *  Not implemented.
 597  */
 598 void WINAPI NotifyWinEvent(DWORD dwEvent, HWND hWnd, LONG nId, LONG nChildId)
 599 {
 600     FIXME("(%ld,%p,%ld,%ld)-stub!\n", dwEvent, hWnd, nId, nChildId);
 601 }
 602
 603
 604 /***********************************************************************
 605  *           IsWinEventHookInstalled                       [USER32.@]
 606  *
 607  * Determine if an event hook is installed for an event.
 608  *
 609  * PARAMS
 610  *  dwEvent  [I] Id of the event
 611  *
 612  * RETURNS
 613  *  TRUE,  If there are any hooks installed for the event.
 614  *  FALSE, Otherwise.
 615  *
 616  * BUGS
 617  *  Not implemented.
 618  */
 619 BOOL WINAPI IsWinEventHookInstalled(DWORD dwEvent)
 620 {
 621     FIXME("(%ld)-stub!\n", dwEvent);
 622     return TRUE;
 623 }