git.oblomov.eu Git - wine/blob - 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 "config.h"
  65 #include "wine/port.h"
  66
  67 #include <stdarg.h>
  68
  69 #include "windef.h"
  70 #include "winbase.h"
  71 #include "winuser.h"
  72 #include "winerror.h"
  73 #include "heap.h"
  74 #include "message.h"
  75 #include "win.h"
  76 #include "wine/server.h"
  77 #include "wine/unicode.h"
  78 #include "wine/debug.h"
  79 #include "winternl.h"
  80
  81 WINE_DEFAULT_DEBUG_CHANNEL(hook);
  82 WINE_DECLARE_DEBUG_CHANNEL(relay);
  83
  84 static const char * const hook_names[WH_MAXHOOK - WH_MINHOOK + 1] =
  85 {
  86     "WH_MSGFILTER",
  87     "WH_JOURNALRECORD",
  88     "WH_JOURNALPLAYBACK",
  89     "WH_KEYBOARD",
  90     "WH_GETMESSAGE",
  91     "WH_CALLWNDPROC",
  92     "WH_CBT",
  93     "WH_SYSMSGFILTER",
  94     "WH_MOUSE",
  95     "WH_HARDWARE",
  96     "WH_DEBUG",
  97     "WH_SHELL",
  98     "WH_FOREGROUNDIDLE",
  99     "WH_CALLWNDPROCRET",
 100     "WH_KEYBOARD_LL",
 101     "WH_MOUSE_LL"
 102 };
 103
 104
 105 /***********************************************************************
 106  *              get_ll_hook_timeout
 107  *
 108  */
 109 static UINT get_ll_hook_timeout(void)
 110 {
 111     /* FIXME: should retrieve LowLevelHooksTimeout in HKEY_CURRENT_USER\Control Panel\Desktop */
 112     return 2000;
 113 }
 114
 115
 116 /***********************************************************************
 117  *              set_windows_hook
 118  *
 119  * Implementation of SetWindowsHookExA and SetWindowsHookExW.
 120  */
 121 static HHOOK set_windows_hook( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid, BOOL unicode )
 122 {
 123     HHOOK handle = 0;
 124     WCHAR module[MAX_PATH];
 125     DWORD len;
 126
 127     if (tid)  /* thread-local hook */
 128     {
 129         if (id == WH_JOURNALRECORD ||
 130             id == WH_JOURNALPLAYBACK ||
 131             id == WH_KEYBOARD_LL ||
 132             id == WH_MOUSE_LL ||
 133             id == WH_SYSMSGFILTER)
 134         {
 135             /* these can only be global */
 136             SetLastError( ERROR_INVALID_PARAMETER );
 137             return 0;
 138         }
 139         inst = 0;
 140     }
 141     else  /* system-global hook */
 142     {
 143         if (id == WH_KEYBOARD_LL || id == WH_MOUSE_LL) inst = 0;
 144         else if (!inst || !(len = GetModuleFileNameW( inst, module, MAX_PATH )) || len >= MAX_PATH)
 145         {
 146             SetLastError( ERROR_INVALID_PARAMETER );
 147             return 0;
 148         }
 149     }
 150
 151     SERVER_START_REQ( set_hook )
 152     {
 153         req->id      = id;
 154         req->tid     = tid;
 155         req->unicode = unicode;
 156         if (inst) /* make proc relative to the module base */
 157         {
 158             req->proc = (void *)((char *)proc - (char *)inst);
 159             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 160         }
 161         else req->proc = proc;
 162
 163         if (!wine_server_call_err( req )) handle = reply->handle;
 164     }
 165     SERVER_END_REQ;
 166
 167     TRACE( "%s %p %lx -> %p\n", hook_names[id-WH_MINHOOK], proc, tid, handle );
 168     return handle;
 169 }
 170
 171
 172 /***********************************************************************
 173  *              call_hook_AtoW
 174  */
 175 static LRESULT call_hook_AtoW( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 176 {
 177     LRESULT ret;
 178     UNICODE_STRING usBuffer;
 179     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 180     else
 181     {
 182         CBT_CREATEWNDA *cbtcwA = (CBT_CREATEWNDA *)lparam;
 183         CBT_CREATEWNDW cbtcwW;
 184         CREATESTRUCTW csW;
 185
 186         cbtcwW.lpcs = &csW;
 187         cbtcwW.hwndInsertAfter = cbtcwA->hwndInsertAfter;
 188         csW = *(CREATESTRUCTW *)cbtcwA->lpcs;
 189
 190         if (HIWORD(cbtcwA->lpcs->lpszName))
 191         {
 192             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszName);
 193             csW.lpszName = usBuffer.Buffer;
 194         }
 195         if (HIWORD(cbtcwA->lpcs->lpszClass))
 196         {
 197             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszClass);
 198             csW.lpszClass = usBuffer.Buffer;
 199         }
 200         ret = proc( code, wparam, (LPARAM)&cbtcwW );
 201         cbtcwA->hwndInsertAfter = cbtcwW.hwndInsertAfter;
 202         if (HIWORD(csW.lpszName)) HeapFree( GetProcessHeap(), 0, (LPWSTR)csW.lpszName );
 203         if (HIWORD(csW.lpszClass)) HeapFree( GetProcessHeap(), 0, (LPWSTR)csW.lpszClass );
 204     }
 205     return ret;
 206 }
 207
 208
 209 /***********************************************************************
 210  *              call_hook_WtoA
 211  */
 212 static LRESULT call_hook_WtoA( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 213 {
 214     LRESULT ret;
 215
 216     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 217     else
 218     {
 219         CBT_CREATEWNDW *cbtcwW = (CBT_CREATEWNDW *)lparam;
 220         CBT_CREATEWNDA cbtcwA;
 221         CREATESTRUCTA csA;
 222
 223         cbtcwA.lpcs = &csA;
 224         cbtcwA.hwndInsertAfter = cbtcwW->hwndInsertAfter;
 225         csA = *(CREATESTRUCTA *)cbtcwW->lpcs;
 226
 227         if (HIWORD(cbtcwW->lpcs->lpszName))
 228             csA.lpszName = HEAP_strdupWtoA( GetProcessHeap(), 0, cbtcwW->lpcs->lpszName );
 229         if (HIWORD(cbtcwW->lpcs->lpszClass))
 230             csA.lpszClass = HEAP_strdupWtoA( GetProcessHeap(), 0, cbtcwW->lpcs->lpszClass );
 231         ret = proc( code, wparam, (LPARAM)&cbtcwA );
 232         cbtcwW->hwndInsertAfter = cbtcwA.hwndInsertAfter;
 233         if (HIWORD(csA.lpszName)) HeapFree( GetProcessHeap(), 0, (LPSTR)csA.lpszName );
 234         if (HIWORD(csA.lpszClass)) HeapFree( GetProcessHeap(), 0, (LPSTR)csA.lpszClass );
 235     }
 236     return ret;
 237 }
 238
 239
 240 /***********************************************************************
 241  *              call_hook
 242  */
 243 static LRESULT call_hook( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam,
 244                           BOOL prev_unicode, BOOL next_unicode )
 245 {
 246     LRESULT ret;
 247
 248     if (TRACE_ON(relay))
 249         DPRINTF( "%04lx:Call hook proc %p (id=%s,code=%x,wp=%08x,lp=%08lx)\n",
 250                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 251
 252     if (!prev_unicode == !next_unicode) ret = proc( code, wparam, lparam );
 253     else if (prev_unicode) ret = call_hook_WtoA( proc, id, code, wparam, lparam );
 254     else ret = call_hook_AtoW( proc, id, code, wparam, lparam );
 255
 256     if (TRACE_ON(relay))
 257         DPRINTF( "%04lx:Ret  hook proc %p (id=%s,code=%x,wp=%08x,lp=%08lx) retval=%08lx\n",
 258                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, ret );
 259
 260     return ret;
 261 }
 262
 263
 264 /***********************************************************************
 265  *              get_hook_proc
 266  *
 267  * Retrieve the hook procedure real value for a module-relative proc
 268  */
 269 static HOOKPROC get_hook_proc( HOOKPROC proc, const WCHAR *module )
 270 {
 271     HMODULE mod;
 272
 273     if (!(mod = GetModuleHandleW(module)))
 274     {
 275         TRACE( "loading %s\n", debugstr_w(module) );
 276         /* FIXME: the library will never be freed */
 277         if (!(mod = LoadLibraryW(module))) return NULL;
 278     }
 279     return (HOOKPROC)((char *)mod + (ULONG_PTR)proc);
 280 }
 281
 282
 283 /***********************************************************************
 284  *              HOOK_CallHooks
 285  */
 286 LRESULT HOOK_CallHooks( INT id, INT code, WPARAM wparam, LPARAM lparam, BOOL unicode )
 287 {
 288     MESSAGEQUEUE *queue = QUEUE_Current();
 289     HOOKPROC proc = NULL;
 290     HHOOK handle = 0;
 291     DWORD pid = 0, tid = 0;
 292     WCHAR module[MAX_PATH];
 293     BOOL unicode_hook = FALSE;
 294     LRESULT ret = 0;
 295
 296     if (!queue) return 0;
 297     SERVER_START_REQ( start_hook_chain )
 298     {
 299         req->id = id;
 300         wine_server_set_reply( req, module, sizeof(module)-sizeof(WCHAR) );
 301         if (!wine_server_call( req ))
 302         {
 303             module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 304             handle       = reply->handle;
 305             proc         = reply->proc;
 306             pid          = reply->pid;
 307             tid          = reply->tid;
 308             unicode_hook = reply->unicode;
 309         }
 310     }
 311     SERVER_END_REQ;
 312
 313     if (tid)
 314     {
 315         TRACE( "calling hook in thread %04lx %s code %x wp %x lp %lx\n",
 316                tid, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 317
 318         switch(id)
 319         {
 320         case WH_KEYBOARD_LL:
 321             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_KEYBOARD_LL_HOOK, wparam, lparam,
 322                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 323             break;
 324         case WH_MOUSE_LL:
 325             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_MOUSE_LL_HOOK, wparam, lparam,
 326                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 327             break;
 328         }
 329     }
 330     else if (proc)
 331     {
 332         TRACE( "calling hook %p %s code %x wp %x lp %lx module %s\n",
 333                proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, debugstr_w(module) );
 334
 335         if (!module[0] || (proc = get_hook_proc( proc, module )) != NULL)
 336         {
 337             int locks = WIN_SuspendWndsLock();
 338             HHOOK prev = queue->hook;
 339             queue->hook = handle;
 340             ret = call_hook( proc, id, code, wparam, lparam, unicode, unicode_hook );
 341             queue->hook = prev;
 342             WIN_RestoreWndsLock( locks );
 343         }
 344
 345     }
 346     else return 0;
 347
 348     SERVER_START_REQ( finish_hook_chain )
 349     {
 350         req->id = id;
 351         wine_server_call( req );
 352     }
 353     SERVER_END_REQ;
 354     return ret;
 355 }
 356
 357
 358 /***********************************************************************
 359  *           HOOK_IsHooked
 360  */
 361 BOOL HOOK_IsHooked( INT id )
 362 {
 363     return TRUE;  /* FIXME */
 364 }
 365
 366
 367 /***********************************************************************
 368  *              SetWindowsHookA (USER32.@)
 369  */
 370 HHOOK WINAPI SetWindowsHookA( INT id, HOOKPROC proc )
 371 {
 372     return SetWindowsHookExA( id, proc, 0, GetCurrentThreadId() );
 373 }
 374
 375
 376 /***********************************************************************
 377  *              SetWindowsHookW (USER32.@)
 378  */
 379 HHOOK WINAPI SetWindowsHookW( INT id, HOOKPROC proc )
 380 {
 381     return SetWindowsHookExW( id, proc, 0, GetCurrentThreadId() );
 382 }
 383
 384
 385 /***********************************************************************
 386  *              SetWindowsHookExA (USER32.@)
 387  */
 388 HHOOK WINAPI SetWindowsHookExA( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 389 {
 390     return set_windows_hook( id, proc, inst, tid, FALSE );
 391 }
 392
 393 /***********************************************************************
 394  *              SetWindowsHookExW (USER32.@)
 395  */
 396 HHOOK WINAPI SetWindowsHookExW( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 397 {
 398     return set_windows_hook( id, proc, inst, tid, TRUE );
 399 }
 400
 401
 402 /***********************************************************************
 403  *              UnhookWindowsHook (USER32.@)
 404  */
 405 BOOL WINAPI UnhookWindowsHook( INT id, HOOKPROC proc )
 406 {
 407     BOOL ret;
 408
 409     TRACE( "%s %p\n", hook_names[id-WH_MINHOOK], proc );
 410
 411     SERVER_START_REQ( remove_hook )
 412     {
 413         req->handle = 0;
 414         req->id   = id;
 415         req->proc = proc;
 416         ret = !wine_server_call_err( req );
 417     }
 418     SERVER_END_REQ;
 419     return ret;
 420 }
 421
 422
 423
 424 /***********************************************************************
 425  *              UnhookWindowsHookEx (USER32.@)
 426  */
 427 BOOL WINAPI UnhookWindowsHookEx( HHOOK hhook )
 428 {
 429     BOOL ret;
 430
 431     TRACE( "%p\n", hhook );
 432
 433     SERVER_START_REQ( remove_hook )
 434     {
 435         req->handle = hhook;
 436         ret = !wine_server_call_err( req );
 437     }
 438     SERVER_END_REQ;
 439     return ret;
 440 }
 441
 442
 443 /***********************************************************************
 444  *              CallNextHookEx (USER32.@)
 445  */
 446 LRESULT WINAPI CallNextHookEx( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 447 {
 448     MESSAGEQUEUE *queue = QUEUE_Current();
 449     HOOKPROC proc = NULL;
 450     WCHAR module[MAX_PATH];
 451     HHOOK handle = 0;
 452     DWORD pid = 0, tid = 0;
 453     INT id = 0;
 454     BOOL prev_unicode = FALSE, next_unicode = FALSE;
 455     LRESULT ret = 0;
 456
 457     if (!queue) return 0;
 458
 459     SERVER_START_REQ( get_next_hook )
 460     {
 461         req->handle = queue->hook;
 462         wine_server_set_reply( req, module, sizeof(module)-sizeof(WCHAR) );
 463         if (!wine_server_call_err( req ))
 464         {
 465             module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 466             handle       = reply->next;
 467             id           = reply->id;
 468             pid          = reply->pid;
 469             tid          = reply->tid;
 470             proc         = reply->proc;
 471             prev_unicode = reply->prev_unicode;
 472             next_unicode = reply->next_unicode;
 473         }
 474     }
 475     SERVER_END_REQ;
 476
 477     if (tid)
 478     {
 479         TRACE( "calling hook in thread %04lx %s code %x wp %x lp %lx\n",
 480                tid, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 481
 482         switch(id)
 483         {
 484         case WH_KEYBOARD_LL:
 485             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_KEYBOARD_LL_HOOK, wparam, lparam,
 486                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 487             break;
 488         case WH_MOUSE_LL:
 489             MSG_SendInternalMessageTimeout( pid, tid, WM_WINE_MOUSE_LL_HOOK, wparam, lparam,
 490                                             SMTO_ABORTIFHUNG, get_ll_hook_timeout(), &ret );
 491             break;
 492         }
 493     }
 494     else if (proc)
 495     {
 496         TRACE( "calling hook %p %s code %x wp %x lp %lx module %s\n",
 497                proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, debugstr_w(module) );
 498
 499         if (!module[0] || (proc = get_hook_proc( proc, module )) != NULL)
 500         {
 501             HHOOK prev = queue->hook;
 502             queue->hook = handle;
 503             ret = call_hook( proc, id, code, wparam, lparam, prev_unicode, next_unicode );
 504             queue->hook = prev;
 505         }
 506     }
 507     return ret;
 508 }
 509
 510
 511 /***********************************************************************
 512  *              CallMsgFilterA (USER32.@)
 513  */
 514 BOOL WINAPI CallMsgFilterA( LPMSG msg, INT code )
 515 {
 516     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, FALSE )) return TRUE;
 517     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, FALSE );
 518 }
 519
 520
 521 /***********************************************************************
 522  *              CallMsgFilterW (USER32.@)
 523  */
 524 BOOL WINAPI CallMsgFilterW( LPMSG msg, INT code )
 525 {
 526     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, TRUE )) return TRUE;
 527     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, TRUE );
 528 }
 529
 530
 531 /***********************************************************************
 532  *           SetWinEventHook                            [USER32.@]
 533  *
 534  * Set up an event hook for a set of events.
 535  *
 536  * PARAMS
 537  *  dwMin     [I] Lowest event handled by pfnProc
 538  *  dwMax     [I] Highest event handled by pfnProc
 539  *  hModule   [I] DLL containing pfnProc
 540  *  pfnProc   [I] Callback event hook function
 541  *  dwProcess [I] Process to get events from, or 0 for all processes
 542  *  dwThread  [I] Thread to get events from, or 0 for all threads
 543  *  dwFlags   [I] Flags indicating the status of pfnProc
 544  *
 545  * RETURNS
 546  *  Success: A handle representing the hook.
 547  *  Failure: A NULL handle.
 548  *
 549  * BUGS
 550  *  Not implemented.
 551  */
 552 HWINEVENTHOOK WINAPI SetWinEventHook(DWORD dwMin, DWORD dwMax, HMODULE hModule,
 553                                      WINEVENTPROC pfnProc, DWORD dwProcess,
 554                                      DWORD dwThread, DWORD dwFlags)
 555 {
 556     FIXME("(%ld,%ld,%p,%p,%ld,%ld,0x%08lx)-stub!\n", dwMin, dwMax, hModule,
 557           pfnProc, dwProcess, dwThread, dwFlags);
 558     return 0;
 559 }
 560
 561
 562 /***********************************************************************
 563  *           UnhookWinEvent                             [USER32.@]
 564  *
 565  * Remove an event hook for a set of events.
 566  *
 567  * PARAMS
 568  *  hEventHook [I] Event hook to remove
 569  *
 570  * RETURNS
 571  *  Success: TRUE. The event hook has been removed.
 572  *  Failure: FALSE, if hEventHook is invalid.
 573  *
 574  * BUGS
 575  *  Not implemented.
 576  */
 577 BOOL WINAPI UnhookWinEvent(HWINEVENTHOOK hEventHook)
 578 {
 579     FIXME("(%p)-stub!\n", hEventHook);
 580
 581     return (hEventHook != 0);
 582 }
 583
 584
 585 /***********************************************************************
 586  *           NotifyWinEvent                             [USER32.@]
 587  *
 588  * Inform the OS that an event has occurred.
 589  *
 590  * PARAMS
 591  *  dwEvent  [I] Id of the event
 592  *  hWnd     [I] Window holding the object that created the event
 593  *  nId      [I] Type of object that created the event
 594  *  nChildId [I] Child object of nId, or CHILDID_SELF.
 595  *
 596  * RETURNS
 597  *  Nothing.
 598  *
 599  * BUGS
 600  *  Not implemented.
 601  */
 602 void WINAPI NotifyWinEvent(DWORD dwEvent, HWND hWnd, LONG nId, LONG nChildId)
 603 {
 604     FIXME("(%ld,%p,%ld,%ld)-stub!\n", dwEvent, hWnd, nId, nChildId);
 605 }
 606
 607
 608 /***********************************************************************
 609  *           IsWinEventHookInstalled                       [USER32.@]
 610  *
 611  * Determine if an event hook is installed for an event.
 612  *
 613  * PARAMS
 614  *  dwEvent  [I] Id of the event
 615  *
 616  * RETURNS
 617  *  TRUE,  If there are any hooks installed for the event.
 618  *  FALSE, Otherwise.
 619  *
 620  * BUGS
 621  *  Not implemented.
 622  */
 623 BOOL WINAPI IsWinEventHookInstalled(DWORD dwEvent)
 624 {
 625     FIXME("(%ld)-stub!\n", dwEvent);
 626     return TRUE;
 627 }