reactos/win32ss/user/user32/windows/hook.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /*
  20  *
  21  * PROJECT:         ReactOS user32.dll
  22  * FILE:            dll/win32/user32/windows/hook.c
  23  * PURPOSE:         Hooks
  24  * PROGRAMMER:      Casper S. Hornstrup (chorns@users.sourceforge.net)
  25  * UPDATE HISTORY:
  26  *      09-05-2001  CSH  Created
  27  */
  28
  29 /* INCLUDES ******************************************************************/
  30
  31 #include <user32.h>
  32
  33 #include <wine/debug.h>
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(user32);
  36
  37 typedef struct _NOTIFYEVENT
  38 {
  39    DWORD event;
  40    LONG  idObject;
  41    LONG  idChild;
  42    DWORD flags;
  43 } NOTIFYEVENT, *PNOTIFYEVENT;
  44
  45 /* PRIVATE FUNCTIONS *********************************************************/
  46
  47 static
  48 DWORD
  49 FASTCALL
  50 GetMaskFromEvent(DWORD Event)
  51 {
  52   DWORD Ret = 0;
  53
  54   if ( Event > EVENT_OBJECT_STATECHANGE )
  55   {
  56     if ( Event == EVENT_OBJECT_LOCATIONCHANGE ) return SRV_EVENT_LOCATIONCHANGE;
  57     if ( Event == EVENT_OBJECT_NAMECHANGE )     return SRV_EVENT_NAMECHANGE;
  58     if ( Event == EVENT_OBJECT_VALUECHANGE )    return SRV_EVENT_VALUECHANGE;
  59     return SRV_EVENT_CREATE;
  60   }
  61
  62   if ( Event == EVENT_OBJECT_STATECHANGE ) return SRV_EVENT_STATECHANGE;
  63
  64   Ret = SRV_EVENT_RUNNING;
  65
  66   if ( Event < EVENT_SYSTEM_MENUSTART )    return SRV_EVENT_CREATE;
  67
  68   if ( Event <= EVENT_SYSTEM_MENUPOPUPEND )
  69   {
  70     Ret = SRV_EVENT_MENU;
  71   }
  72   else
  73   {
  74     if ( Event <= EVENT_CONSOLE_CARET-1 )         return SRV_EVENT_CREATE;
  75     if ( Event <= EVENT_CONSOLE_END_APPLICATION ) return SRV_EVENT_END_APPLICATION;
  76     if ( Event != EVENT_OBJECT_FOCUS )            return SRV_EVENT_CREATE;
  77   }
  78   return Ret;
  79 }
  80
  81 static
  82 HHOOK
  83 FASTCALL
  84 IntSetWindowsHook(
  85     int idHook,
  86     HOOKPROC lpfn,
  87     HINSTANCE hMod,
  88     DWORD dwThreadId,
  89     BOOL bAnsi)
  90 {
  91   WCHAR ModuleName[MAX_PATH];
  92   UNICODE_STRING USModuleName;
  93
  94   if (NULL != hMod)
  95     {
  96       if (0 == GetModuleFileNameW(hMod, ModuleName, MAX_PATH))
  97         {
  98           return NULL;
  99         }
 100       RtlInitUnicodeString(&USModuleName, ModuleName);
 101     }
 102   else
 103     {
 104       RtlInitUnicodeString(&USModuleName, NULL);
 105     }
 106
 107   return NtUserSetWindowsHookEx(hMod, &USModuleName, dwThreadId, idHook, lpfn, bAnsi);
 108 }
 109
 110 /*
 111    Since ReactOS uses User32 as the main message source this was needed.
 112    Base on the funny rules from the wine tests it left it with this option.
 113    8^(
 114  */
 115 VOID
 116 FASTCALL
 117 IntNotifyWinEvent(
 118                  DWORD event,
 119                  HWND  hwnd,
 120                  LONG  idObject,
 121                  LONG  idChild,
 122                  DWORD flags
 123                  )
 124 {
 125   NOTIFYEVENT ne;
 126   ne.event    = event;
 127   ne.idObject = idObject;
 128   ne.idChild  = idChild;
 129   ne.flags    = flags;
 130   if (gpsi->dwInstalledEventHooks & GetMaskFromEvent(event))
 131   NtUserxNotifyWinEvent(hwnd, &ne);
 132 }
 133
 134 /* FUNCTIONS *****************************************************************/
 135
 136 #if 0
 137 BOOL
 138 WINAPI
 139 CallMsgFilter(
 140   LPMSG lpMsg,
 141   int nCode)
 142 {
 143   UNIMPLEMENTED;
 144   return FALSE;
 145 }
 146 #endif
 147
 148 /*
 149  * @implemented
 150  */
 151 BOOL
 152 WINAPI
 153 CallMsgFilterA(
 154   LPMSG lpMsg,
 155   int nCode)
 156 {
 157   MSG Msg;
 158   if ( NtCurrentTeb()->Win32ThreadInfo &&
 159       (ISITHOOKED(WH_MSGFILTER) || ISITHOOKED(WH_SYSMSGFILTER)) )
 160   {
 161      if ( lpMsg->message & ~WM_MAXIMUM )
 162      {
 163         SetLastError(ERROR_INVALID_PARAMETER);
 164         return FALSE;
 165      }
 166      RtlCopyMemory(&Msg, lpMsg, sizeof(MSG));
 167      return NtUserCallMsgFilter( &Msg, nCode);
 168   }
 169   return FALSE;
 170 }
 171
 172
 173 /*
 174  * @implemented
 175  */
 176 BOOL
 177 WINAPI
 178 CallMsgFilterW(
 179   LPMSG lpMsg,
 180   int nCode)
 181 {
 182   MSG Msg;
 183   if ( NtCurrentTeb()->Win32ThreadInfo &&
 184       (ISITHOOKED(WH_MSGFILTER) || ISITHOOKED(WH_SYSMSGFILTER)) )
 185   {
 186      if ( lpMsg->message & ~WM_MAXIMUM )
 187      {
 188         SetLastError(ERROR_INVALID_PARAMETER);
 189         return FALSE;
 190      }
 191      RtlCopyMemory(&Msg, lpMsg, sizeof(MSG));
 192      return  NtUserCallMsgFilter( &Msg, nCode);
 193   }
 194   return FALSE;
 195 }
 196
 197
 198 /*
 199  * @implemented
 200  */
 201 LRESULT
 202 WINAPI
 203 CallNextHookEx(
 204   HHOOK Hook,  // Windows NT/XP/2003: Ignored.
 205   int Code,
 206   WPARAM wParam,
 207   LPARAM lParam)
 208 {
 209   PCLIENTINFO ClientInfo;
 210   DWORD Flags, Save;
 211   PHOOK pHook, phkNext;
 212   LRESULT lResult = 0;
 213
 214   //GetConnected();
 215
 216   ClientInfo = GetWin32ClientInfo();
 217
 218   if (!ClientInfo->phkCurrent) return 0;
 219
 220   pHook = DesktopPtrToUser(ClientInfo->phkCurrent);
 221
 222   if (!pHook->phkNext) return 0; // Nothing to do....
 223
 224   phkNext = DesktopPtrToUser(pHook->phkNext);
 225
 226   if ( phkNext->HookId == WH_CALLWNDPROC ||
 227        phkNext->HookId == WH_CALLWNDPROCRET)
 228   {
 229      Save = ClientInfo->dwHookData;
 230      Flags = ClientInfo->CI_flags & CI_CURTHPRHOOK;
 231 // wParam: If the message was sent by the current thread/process, it is
 232 // nonzero; otherwise, it is zero.
 233      if (wParam) ClientInfo->CI_flags |= CI_CURTHPRHOOK;
 234      else        ClientInfo->CI_flags &= ~CI_CURTHPRHOOK;
 235
 236      if (phkNext->HookId == WH_CALLWNDPROC)
 237      {
 238         PCWPSTRUCT pCWP = (PCWPSTRUCT)lParam;
 239
 240         NtUserMessageCall( pCWP->hwnd,
 241                            pCWP->message,
 242                            pCWP->wParam,
 243                            pCWP->lParam,
 244                           (ULONG_PTR)&lResult,
 245                            FNID_CALLWNDPROC,
 246                            phkNext->Ansi);
 247      }
 248      else
 249      {
 250         PCWPRETSTRUCT pCWPR = (PCWPRETSTRUCT)lParam;
 251
 252         ClientInfo->dwHookData = pCWPR->lResult;
 253
 254         NtUserMessageCall( pCWPR->hwnd,
 255                            pCWPR->message,
 256                            pCWPR->wParam,
 257                            pCWPR->lParam,
 258                           (ULONG_PTR)&lResult,
 259                            FNID_CALLWNDPROCRET,
 260                            phkNext->Ansi);
 261      }
 262      ClientInfo->CI_flags ^= ((ClientInfo->CI_flags ^ Flags) & CI_CURTHPRHOOK);
 263      ClientInfo->dwHookData = Save;
 264   }
 265   else
 266      lResult = NtUserCallNextHookEx(Code, wParam, lParam, pHook->Ansi);
 267
 268   return lResult;
 269 }
 270
 271
 272 /*
 273  * @implemented
 274  */
 275 HHOOK
 276 WINAPI
 277 SetWindowsHookW(int idHook, HOOKPROC lpfn)
 278 {
 279   DWORD ThreadId = PtrToUint(NtCurrentTeb()->ClientId.UniqueThread);
 280   return IntSetWindowsHook(idHook, lpfn, NULL, ThreadId, FALSE);
 281 //  return NtUserSetWindowsHookAW(idHook, lpfn, FALSE);
 282 }
 283
 284 /*
 285  * @implemented
 286  */
 287 HHOOK
 288 WINAPI
 289 SetWindowsHookA(int idHook, HOOKPROC lpfn)
 290 {
 291   DWORD ThreadId = PtrToUint(NtCurrentTeb()->ClientId.UniqueThread);
 292   return IntSetWindowsHook(idHook, lpfn, NULL, ThreadId, TRUE);
 293 //  return NtUserSetWindowsHookAW(idHook, lpfn, TRUE);
 294 }
 295
 296 /*
 297  * @unimplemented
 298  */
 299 BOOL
 300 WINAPI
 301 DeregisterShellHookWindow(HWND hWnd)
 302 {
 303   return NtUserxDeregisterShellHookWindow(hWnd);
 304 }
 305
 306 /*
 307  * @unimplemented
 308  */
 309 BOOL
 310 WINAPI
 311 RegisterShellHookWindow(HWND hWnd)
 312 {
 313   return NtUserxRegisterShellHookWindow(hWnd);
 314 }
 315
 316 /*
 317  * @implemented
 318  */
 319 BOOL
 320 WINAPI
 321 UnhookWindowsHook ( int nCode, HOOKPROC pfnFilterProc )
 322 {
 323   return NtUserxUnhookWindowsHook(nCode, pfnFilterProc);
 324 }
 325
 326 /*
 327  * @implemented
 328  */
 329 VOID
 330 WINAPI
 331 NotifyWinEvent(
 332                DWORD event,
 333                HWND  hwnd,
 334                LONG  idObject,
 335                LONG  idChild
 336                )
 337 {
 338 // "Servers call NotifyWinEvent to announce the event to the system after the
 339 // event has occurred; they must never notify the system of an event before
 340 // the event has occurred." msdn on NotifyWinEvent.
 341   if (gpsi->dwInstalledEventHooks & GetMaskFromEvent(event)) // Check to see.
 342       NtUserNotifyWinEvent(event, hwnd, idObject, idChild);
 343 }
 344
 345 /*
 346  * @implemented
 347  */
 348 HWINEVENTHOOK
 349 WINAPI
 350 SetWinEventHook(
 351                 UINT         eventMin,
 352                 UINT         eventMax,
 353                 HMODULE      hmodWinEventProc,
 354                 WINEVENTPROC pfnWinEventProc,
 355                 DWORD        idProcess,
 356                 DWORD        idThread,
 357                 UINT         dwFlags
 358                 )
 359 {
 360   WCHAR ModuleName[MAX_PATH];
 361   UNICODE_STRING USModuleName;
 362
 363   if ((hmodWinEventProc != NULL) && (dwFlags & WINEVENT_INCONTEXT))
 364   {
 365       if (0 == GetModuleFileNameW(hmodWinEventProc, ModuleName, MAX_PATH))
 366       {
 367           return NULL;
 368       }
 369       RtlInitUnicodeString(&USModuleName, ModuleName);
 370   }
 371   else
 372   {
 373       RtlInitUnicodeString(&USModuleName, NULL);
 374   }
 375
 376   return NtUserSetWinEventHook(eventMin,
 377                                eventMax,
 378                        hmodWinEventProc,
 379                           &USModuleName,
 380                         pfnWinEventProc,
 381                               idProcess,
 382                                idThread,
 383                                 dwFlags);
 384 }
 385
 386 /*
 387  * @implemented
 388  */
 389 BOOL
 390 WINAPI
 391 IsWinEventHookInstalled(
 392     DWORD event)
 393 {
 394   if ((PTHREADINFO)NtCurrentTeb()->Win32ThreadInfo)
 395   {
 396      return (gpsi->dwInstalledEventHooks & GetMaskFromEvent(event)) != 0;
 397   }
 398   return FALSE;
 399 }
 400
 401 /*
 402  * @implemented
 403  */
 404 HHOOK
 405 WINAPI
 406 SetWindowsHookExA(
 407     int idHook,
 408     HOOKPROC lpfn,
 409     HINSTANCE hMod,
 410     DWORD dwThreadId)
 411 {
 412   return IntSetWindowsHook(idHook, lpfn, hMod, dwThreadId, TRUE);
 413 }
 414
 415
 416 /*
 417  * @implemented
 418  */
 419 HHOOK
 420 WINAPI
 421 SetWindowsHookExW(
 422     int idHook,
 423     HOOKPROC lpfn,
 424     HINSTANCE hMod,
 425     DWORD dwThreadId)
 426 {
 427   return IntSetWindowsHook(idHook, lpfn, hMod, dwThreadId, FALSE);
 428 }
 429
 430 static
 431 BOOL
 432 ClientLoadLibrary(
 433     PUNICODE_STRING pstrLibName,
 434     PUNICODE_STRING pstrInitFunc,
 435     BOOL bUnload,
 436     BOOL bApiHook)
 437 {
 438     HINSTANCE hLibrary;
 439     PVOID pInitFunction;
 440     NTSTATUS Status;
 441     ANSI_STRING InitFuncName;
 442     BOOL bResult = FALSE;
 443
 444     TRACE("ClientLoadLibrary: pid: %d, strLibraryName: %S, "
 445           "strInitFuncName: %S, bUnload: %d, bApiHook:%d\n",
 446           GetCurrentProcessId(),
 447           pstrLibName->Buffer,
 448           pstrInitFunc->Buffer,
 449           bUnload,
 450           bApiHook);
 451
 452     /* Check if we have to load the module */
 453     if (bUnload == FALSE)
 454     {
 455         ASSERT(pstrLibName->Buffer != NULL);
 456
 457         /* Load it */
 458         hLibrary = LoadLibrary(pstrLibName->Buffer);
 459         if (hLibrary == 0)
 460         {
 461             return FALSE;
 462         }
 463
 464         if (!bApiHook)
 465         {
 466             /* There is nothing more to do for a global hook*/
 467             return TRUE;
 468         }
 469
 470         /* Initialize the user api hook */
 471         ASSERT(pstrInitFunc->Buffer);
 472         Status = RtlUnicodeStringToAnsiString(&InitFuncName,
 473                                               pstrInitFunc,
 474                                               TRUE);
 475         if (!NT_SUCCESS(Status))
 476         {
 477             FreeLibrary(hLibrary);
 478             return FALSE;
 479         }
 480
 481         /* Get the address of the initialization routine */
 482         pInitFunction = GetProcAddress(hLibrary, InitFuncName.Buffer);
 483         if (pInitFunction)
 484         {
 485             /* Call the initialization routine */
 486             bResult = InitUserApiHook(hLibrary, (USERAPIHOOKPROC)pInitFunction);
 487         }
 488
 489         RtlFreeAnsiString(&InitFuncName);
 490
 491         /* In case of error unload the library */
 492         if (bResult == FALSE)
 493         {
 494             FreeLibrary(hLibrary);
 495         }
 496     }
 497     else
 498     {
 499         /* Cleanup user api hook before unloading */
 500         if (bApiHook)
 501         {
 502             hLibrary = ghmodUserApiHook;
 503             bResult = ClearUserApiHook(ghmodUserApiHook);
 504
 505             /* Check if we can we unload it now */
 506             if (!bResult)
 507             {
 508                 /* Return success because we are going to free
 509                    the library in EndUserApiHook*/
 510                 return TRUE;
 511             }
 512         }
 513         else
 514         {
 515             /* Get the library handle from the name */
 516             hLibrary = GetModuleHandle(pstrLibName->Buffer);
 517             if (hLibrary == NULL)
 518             {
 519                 return FALSE;
 520             }
 521         }
 522
 523         bResult = FreeLibrary(hLibrary);
 524     }
 525
 526     return bResult;
 527 }
 528
 529 NTSTATUS WINAPI
 530 User32CallClientLoadLibraryFromKernel(PVOID Arguments, ULONG ArgumentLength)
 531 {
 532     BOOL bResult;
 533     PCLIENT_LOAD_LIBRARY_ARGUMENTS Argument;
 534
 535     /* Retireve the callback parameters */
 536     Argument = (PCLIENT_LOAD_LIBRARY_ARGUMENTS)Arguments;
 537     if(Argument->strLibraryName.Buffer != NULL)
 538     {
 539         Argument->strLibraryName.Buffer = (PWCHAR)((ULONG_PTR)Argument->strLibraryName.Buffer + (ULONG_PTR)Argument);
 540     }
 541     if(Argument->strInitFuncName.Buffer != NULL)
 542     {
 543         Argument->strInitFuncName.Buffer = (PWCHAR)((ULONG_PTR)Argument->strInitFuncName.Buffer + (ULONG_PTR)Argument);
 544     }
 545
 546     /* Call the implementation of the callback */
 547     bResult = ClientLoadLibrary(&Argument->strLibraryName,
 548                                 &Argument->strInitFuncName,
 549                                 Argument->Unload,
 550                                 Argument->ApiHook);
 551
 552     return ZwCallbackReturn(&bResult, sizeof(HINSTANCE), STATUS_SUCCESS);
 553 }
 554
 555 NTSTATUS WINAPI
 556 User32CallHookProcFromKernel(PVOID Arguments, ULONG ArgumentLength)
 557 {
 558   PHOOKPROC_CALLBACK_ARGUMENTS Common;
 559   CREATESTRUCTW Csw;
 560   CBT_CREATEWNDW CbtCreatewndw;
 561   PHOOKPROC_CBT_CREATEWND_EXTRA_ARGUMENTS CbtCreatewndExtra = NULL;
 562   KBDLLHOOKSTRUCT KeyboardLlData, *pKeyboardLlData;
 563   MSLLHOOKSTRUCT MouseLlData, *pMouseLlData;
 564   MSG *pcMsg, *pMsg;
 565   PMOUSEHOOKSTRUCT pMHook;
 566   CWPSTRUCT *pCWP;
 567   CWPRETSTRUCT *pCWPR;
 568   PRECTL prl;
 569   LPCBTACTIVATESTRUCT pcbtas;
 570   WPARAM wParam = 0;
 571   LPARAM lParam = 0;
 572   LRESULT Result = 0;
 573   BOOL Hit = FALSE;
 574
 575   Common = (PHOOKPROC_CALLBACK_ARGUMENTS) Arguments;
 576
 577   switch(Common->HookId)
 578   {
 579     case WH_CBT:
 580     {
 581       //ERR("WH_CBT: Code %d\n", Common->Code);
 582       switch(Common->Code)
 583       {
 584         case HCBT_CREATEWND:
 585           CbtCreatewndExtra = (PHOOKPROC_CBT_CREATEWND_EXTRA_ARGUMENTS)
 586                               ((PCHAR) Common + Common->lParam);
 587           RtlCopyMemory(&Csw, &CbtCreatewndExtra->Cs, sizeof(CREATESTRUCTW));
 588           CbtCreatewndw.lpcs = &Csw;
 589           CbtCreatewndw.hwndInsertAfter = CbtCreatewndExtra->WndInsertAfter;
 590           wParam = Common->wParam;
 591           lParam = (LPARAM) &CbtCreatewndw;
 592           //ERR("HCBT_CREATEWND: hWnd 0x%x Name 0x%x Class 0x%x\n", Common->wParam, Csw.lpszName, Csw.lpszClass);
 593           break;
 594         case HCBT_CLICKSKIPPED:
 595             pMHook = (PMOUSEHOOKSTRUCT)((PCHAR) Common + Common->lParam);
 596             lParam = (LPARAM) pMHook;
 597             break;
 598         case HCBT_MOVESIZE:
 599             prl = (PRECTL)((PCHAR) Common + Common->lParam);
 600             lParam = (LPARAM) prl;
 601             break;
 602         case HCBT_ACTIVATE:
 603             pcbtas = (LPCBTACTIVATESTRUCT)((PCHAR) Common + Common->lParam);
 604             lParam = (LPARAM) pcbtas;
 605             break;
 606         case HCBT_KEYSKIPPED: /* The rest SEH support */
 607         case HCBT_MINMAX:
 608         case HCBT_SETFOCUS:
 609         case HCBT_SYSCOMMAND:
 610         case HCBT_DESTROYWND:
 611         case HCBT_QS:
 612             wParam = Common->wParam;
 613             lParam = Common->lParam;
 614             break;
 615         default:
 616           ERR("HCBT_ not supported = %d\n", Common->Code);
 617           return ZwCallbackReturn(NULL, 0, STATUS_NOT_SUPPORTED);
 618       }
 619
 620       if (Common->Proc)
 621       {
 622          _SEH2_TRY
 623          {
 624             Result = Common->Proc(Common->Code, wParam, lParam);
 625          }
 626          _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 627          {
 628             Hit = TRUE;
 629          }
 630          _SEH2_END;
 631       }
 632       else
 633       {
 634          ERR("Null Proc! Common = 0x%x, Proc = 0x%x\n",Common,Common->Proc);
 635       }
 636       switch(Common->Code)
 637       {
 638         case HCBT_CREATEWND:
 639           CbtCreatewndExtra->WndInsertAfter = CbtCreatewndw.hwndInsertAfter;
 640           CbtCreatewndExtra->Cs.x = CbtCreatewndw.lpcs->x;
 641           CbtCreatewndExtra->Cs.y = CbtCreatewndw.lpcs->y;
 642           CbtCreatewndExtra->Cs.cx = CbtCreatewndw.lpcs->cx;
 643           CbtCreatewndExtra->Cs.cy = CbtCreatewndw.lpcs->cy;
 644           break;
 645       }
 646       break;
 647     }
 648     case WH_KEYBOARD_LL:
 649       //ERR("WH_KEYBOARD_LL: Code %d, wParam %d\n",Common->Code,Common->wParam);
 650       pKeyboardLlData = (PKBDLLHOOKSTRUCT)((PCHAR) Common + Common->lParam);
 651       RtlCopyMemory(&KeyboardLlData, pKeyboardLlData, sizeof(KBDLLHOOKSTRUCT));
 652       Result = Common->Proc(Common->Code, Common->wParam, (LPARAM) &KeyboardLlData);
 653       break;
 654     case WH_MOUSE_LL:
 655       //ERR("WH_MOUSE_LL: Code %d, wParam %d\n",Common->Code,Common->wParam);
 656       pMouseLlData = (PMSLLHOOKSTRUCT)((PCHAR) Common + Common->lParam);
 657       RtlCopyMemory(&MouseLlData, pMouseLlData, sizeof(MSLLHOOKSTRUCT));
 658       Result = Common->Proc(Common->Code, Common->wParam, (LPARAM) &MouseLlData);
 659       break;
 660     case WH_MOUSE: /* SEH support */
 661       pMHook = (PMOUSEHOOKSTRUCT)((PCHAR) Common + Common->lParam);
 662       _SEH2_TRY
 663       {
 664          Result = Common->Proc(Common->Code, Common->wParam, (LPARAM) pMHook);
 665       }
 666       _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 667       {
 668          Hit = TRUE;
 669       }
 670       _SEH2_END;
 671       break;
 672     case WH_CALLWNDPROC:
 673 //      ERR("WH_CALLWNDPROC: Code %d, wParam %d\n",Common->Code,Common->wParam);
 674       pCWP = HeapAlloc(GetProcessHeap(), 0, ArgumentLength - sizeof(HOOKPROC_CALLBACK_ARGUMENTS));
 675       RtlCopyMemory(pCWP, (PCHAR) Common + Common->lParam, sizeof(CWPSTRUCT));
 676       /* If more memory is reserved, then lParam is a pointer.
 677        * Size of the buffer is stocked in the lParam member, and its content
 678        * is at the end of the argument buffer */
 679       if(ArgumentLength > (sizeof(CWPSTRUCT) + sizeof(HOOKPROC_CALLBACK_ARGUMENTS)))
 680       {
 681          RtlCopyMemory((PCHAR)pCWP + sizeof(CWPSTRUCT),
 682             (PCHAR)Common + Common->lParam + sizeof(CWPSTRUCT),
 683             pCWP->lParam);
 684          pCWP->lParam = (LPARAM)((PCHAR)pCWP + sizeof(CWPSTRUCT));
 685       }
 686       Result = Common->Proc(Common->Code, Common->wParam, (LPARAM) pCWP);
 687       HeapFree(GetProcessHeap(), 0, pCWP);
 688       break;
 689     case WH_CALLWNDPROCRET:
 690       /* Almost the same as WH_CALLWNDPROC */
 691       pCWPR = HeapAlloc(GetProcessHeap(), 0, ArgumentLength - sizeof(HOOKPROC_CALLBACK_ARGUMENTS));
 692       RtlCopyMemory(pCWPR, (PCHAR) Common + Common->lParam, sizeof(CWPRETSTRUCT));
 693       if(ArgumentLength > (sizeof(CWPRETSTRUCT) + sizeof(HOOKPROC_CALLBACK_ARGUMENTS)))
 694       {
 695          RtlCopyMemory((PCHAR)pCWPR + sizeof(CWPRETSTRUCT),
 696             (PCHAR)Common + Common->lParam + sizeof(CWPRETSTRUCT),
 697             pCWPR->lParam);
 698          pCWPR->lParam = (LPARAM)((PCHAR)pCWPR + sizeof(CWPRETSTRUCT));
 699       }
 700       Result = Common->Proc(Common->Code, Common->wParam, (LPARAM) pCWPR);
 701       HeapFree(GetProcessHeap(), 0, pCWPR);
 702       break;
 703     case WH_MSGFILTER: /* All SEH support */
 704     case WH_SYSMSGFILTER:
 705     case WH_GETMESSAGE:
 706       pMsg = (PMSG)((PCHAR) Common + Common->lParam);
 707       pcMsg = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(MSG));
 708       RtlCopyMemory(pcMsg, pMsg, sizeof(MSG));
 709 //      ERR("pMsg %d  pcMsg %d\n",pMsg->message, pcMsg->message);
 710       _SEH2_TRY
 711       {
 712          Result = Common->Proc(Common->Code, Common->wParam, (LPARAM) pcMsg);
 713       }
 714       _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 715       {
 716          Hit = TRUE;
 717       }
 718       _SEH2_END;
 719       if (!Hit && Common->HookId == WH_GETMESSAGE)
 720          RtlCopyMemory(pMsg, pcMsg, sizeof(MSG));
 721       HeapFree( GetProcessHeap(), 0, pcMsg );
 722       break;
 723     case WH_KEYBOARD:
 724     case WH_SHELL:
 725       Result = Common->Proc(Common->Code, Common->wParam, Common->lParam);
 726       break;
 727     case WH_FOREGROUNDIDLE: /* <-- SEH support */
 728       _SEH2_TRY
 729       {
 730          Result = Common->Proc(Common->Code, Common->wParam, Common->lParam);
 731       }
 732       _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 733       {
 734          Hit = TRUE;
 735       }
 736       _SEH2_END;
 737       break;
 738     default:
 739       return ZwCallbackReturn(NULL, 0, STATUS_NOT_SUPPORTED);
 740   }
 741   if (Hit)
 742   {
 743      ERR("Hook Exception! Id: %d, Code %d, Proc 0x%x\n",Common->HookId,Common->Code,Common->Proc);
 744   }
 745   return ZwCallbackReturn(&Result, sizeof(LRESULT), STATUS_SUCCESS);
 746 }
 747
 748 NTSTATUS WINAPI
 749 User32CallEventProcFromKernel(PVOID Arguments, ULONG ArgumentLength)
 750 {
 751   PEVENTPROC_CALLBACK_ARGUMENTS Common;
 752
 753   Common = (PEVENTPROC_CALLBACK_ARGUMENTS) Arguments;
 754
 755   Common->Proc(Common->hook,
 756                Common->event,
 757                Common->hwnd,
 758                Common->idObject,
 759                Common->idChild,
 760                Common->dwEventThread,
 761                Common->dwmsEventTime);
 762
 763   return ZwCallbackReturn(NULL, 0, STATUS_SUCCESS);
 764 }
 765
 766
 767