dlls/ole32/errorinfo.c

   1 /*
   2  * ErrorInfo API
   3  *
   4  * Copyright 2000 Patrik Stridvall, Juergen Schmied
   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  *
  22  * The errorinfo is a per-thread object. The reference is stored in the
  23  * TEB at offset 0xf80.
  24  */
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28
  29 #define COBJMACROS
  30
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "objbase.h"
  34 #include "oleauto.h"
  35 #include "winerror.h"
  36
  37 #include "wine/unicode.h"
  38 #include "compobj_private.h"
  39
  40 #include "wine/debug.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  43
  44 /* this code is from SysAllocStringLen (ole2disp.c in oleaut32) */
  45 static BSTR WINAPI ERRORINFO_SysAllocString(const OLECHAR* in)
  46 {
  47     DWORD  bufferSize;
  48     DWORD* newBuffer;
  49     WCHAR* stringBuffer;
  50     DWORD len;
  51
  52     if (in == NULL)
  53         return NULL;
  54     /*
  55      * Find the lenth of the buffer passed-in in bytes.
  56      */
  57     len = strlenW(in);
  58     bufferSize = len * sizeof (WCHAR);
  59
  60     /*
  61      * Allocate a new buffer to hold the string.
  62      * don't forget to keep an empty spot at the beginning of the
  63      * buffer for the character count and an extra character at the
  64      * end for the '\0'.
  65      */
  66     newBuffer = HeapAlloc(GetProcessHeap(), 0,
  67                                  bufferSize + sizeof(WCHAR) + sizeof(DWORD));
  68
  69     /*
  70      * If the memory allocation failed, return a null pointer.
  71      */
  72     if (newBuffer==0)
  73       return 0;
  74
  75     /*
  76      * Copy the length of the string in the placeholder.
  77      */
  78     *newBuffer = bufferSize;
  79
  80     /*
  81      * Skip the byte count.
  82      */
  83     newBuffer++;
  84
  85     /*
  86      * Copy the information in the buffer.
  87      * Since it is valid to pass a NULL pointer here, we'll initialize the
  88      * buffer to nul if it is the case.
  89      */
  90     if (in != 0)
  91       memcpy(newBuffer, in, bufferSize);
  92     else
  93       memset(newBuffer, 0, bufferSize);
  94
  95     /*
  96      * Make sure that there is a nul character at the end of the
  97      * string.
  98      */
  99     stringBuffer = (WCHAR*)newBuffer;
 100     stringBuffer[len] = 0;
 101
 102     return (LPWSTR)stringBuffer;
 103 }
 104
 105 /* this code is from SysFreeString (ole2disp.c in oleaut32)*/
 106 static VOID WINAPI ERRORINFO_SysFreeString(BSTR in)
 107 {
 108     DWORD* bufferPointer;
 109
 110     /* NULL is a valid parameter */
 111     if(!in) return;
 112
 113     /*
 114      * We have to be careful when we free a BSTR pointer, it points to
 115      * the beginning of the string but it skips the byte count contained
 116      * before the string.
 117      */
 118     bufferPointer = (DWORD*)in;
 119
 120     bufferPointer--;
 121
 122     /*
 123      * Free the memory from it's "real" origin.
 124      */
 125     HeapFree(GetProcessHeap(), 0, bufferPointer);
 126 }
 127
 128
 129 typedef struct ErrorInfoImpl
 130 {
 131         const IErrorInfoVtbl           *lpvtei;
 132         const ICreateErrorInfoVtbl     *lpvtcei;
 133         const ISupportErrorInfoVtbl    *lpvtsei;
 134         LONG                            ref;
 135
 136         GUID m_Guid;
 137         BSTR bstrSource;
 138         BSTR bstrDescription;
 139         BSTR bstrHelpFile;
 140         DWORD m_dwHelpContext;
 141 } ErrorInfoImpl;
 142
 143 static const IErrorInfoVtbl        IErrorInfoImpl_VTable;
 144 static const ICreateErrorInfoVtbl  ICreateErrorInfoImpl_VTable;
 145 static const ISupportErrorInfoVtbl ISupportErrorInfoImpl_VTable;
 146
 147 /*
 148  converts an object pointer to This
 149  */
 150
 151 static inline ErrorInfoImpl *impl_from_IErrorInfo( IErrorInfo *iface )
 152 {
 153     return (ErrorInfoImpl *)((char*)iface - FIELD_OFFSET(ErrorInfoImpl, lpvtei));
 154 }
 155
 156 static inline ErrorInfoImpl *impl_from_ICreateErrorInfo( ICreateErrorInfo *iface )
 157 {
 158     return (ErrorInfoImpl *)((char*)iface - FIELD_OFFSET(ErrorInfoImpl, lpvtcei));
 159 }
 160
 161 static inline ErrorInfoImpl *impl_from_ISupportErrorInfo( ISupportErrorInfo *iface )
 162 {
 163     return (ErrorInfoImpl *)((char*)iface - FIELD_OFFSET(ErrorInfoImpl, lpvtsei));
 164 }
 165
 166
 167 /*
 168  converts This to an object pointer
 169  */
 170 #define _IErrorInfo_(This)              (IErrorInfo*)&(This->lpvtei)
 171 #define _ICreateErrorInfo_(This)        (ICreateErrorInfo*)&(This->lpvtcei)
 172 #define _ISupportErrorInfo_(This)       (ISupportErrorInfo*)&(This->lpvtsei)
 173
 174 IErrorInfo * IErrorInfoImpl_Constructor(void)
 175 {
 176         ErrorInfoImpl * ei = HeapAlloc(GetProcessHeap(), 0, sizeof(ErrorInfoImpl));
 177         if (ei)
 178         {
 179           ei->lpvtei = &IErrorInfoImpl_VTable;
 180           ei->lpvtcei = &ICreateErrorInfoImpl_VTable;
 181           ei->lpvtsei = &ISupportErrorInfoImpl_VTable;
 182           ei->ref = 1;
 183           ei->bstrSource = NULL;
 184           ei->bstrDescription = NULL;
 185           ei->bstrHelpFile = NULL;
 186           ei->m_dwHelpContext = 0;
 187         }
 188         return (IErrorInfo *)ei;
 189 }
 190
 191
 192 static HRESULT WINAPI IErrorInfoImpl_QueryInterface(
 193         IErrorInfo* iface,
 194         REFIID     riid,
 195         VOID**     ppvoid)
 196 {
 197         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 198         TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvoid);
 199
 200         *ppvoid = NULL;
 201
 202         if(IsEqualIID(riid, &IID_IErrorInfo))
 203         {
 204           *ppvoid = _IErrorInfo_(This);
 205         }
 206         else if(IsEqualIID(riid, &IID_ICreateErrorInfo))
 207         {
 208           *ppvoid = _ICreateErrorInfo_(This);
 209         }
 210         else if(IsEqualIID(riid, &IID_ISupportErrorInfo))
 211         {
 212           *ppvoid = _ISupportErrorInfo_(This);
 213         }
 214
 215         if(*ppvoid)
 216         {
 217           IUnknown_AddRef( (IUnknown*)*ppvoid );
 218           TRACE("-- Interface: (%p)->(%p)\n",ppvoid,*ppvoid);
 219           return S_OK;
 220         }
 221         TRACE("-- Interface: E_NOINTERFACE\n");
 222         return E_NOINTERFACE;
 223 }
 224
 225 static ULONG WINAPI IErrorInfoImpl_AddRef(
 226         IErrorInfo* iface)
 227 {
 228         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 229         TRACE("(%p)->(count=%lu)\n",This,This->ref);
 230         return InterlockedIncrement(&This->ref);
 231 }
 232
 233 static ULONG WINAPI IErrorInfoImpl_Release(
 234         IErrorInfo* iface)
 235 {
 236         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 237         ULONG ref = InterlockedDecrement(&This->ref);
 238
 239         TRACE("(%p)->(count=%lu)\n",This,ref+1);
 240
 241         if (!ref)
 242         {
 243           TRACE("-- destroying IErrorInfo(%p)\n",This);
 244           HeapFree(GetProcessHeap(),0,This);
 245           return 0;
 246         }
 247         return ref;
 248 }
 249
 250 static HRESULT WINAPI IErrorInfoImpl_GetGUID(
 251         IErrorInfo* iface,
 252         GUID * pGUID)
 253 {
 254         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 255         TRACE("(%p)->(count=%lu)\n",This,This->ref);
 256         if(!pGUID )return E_INVALIDARG;
 257         memcpy(pGUID, &This->m_Guid, sizeof(GUID));
 258         return S_OK;
 259 }
 260
 261 static HRESULT WINAPI IErrorInfoImpl_GetSource(
 262         IErrorInfo* iface,
 263         BSTR *pBstrSource)
 264 {
 265         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 266         TRACE("(%p)->(pBstrSource=%p)\n",This,pBstrSource);
 267         if (pBstrSource == NULL)
 268             return E_INVALIDARG;
 269         *pBstrSource = ERRORINFO_SysAllocString(This->bstrSource);
 270         return S_OK;
 271 }
 272
 273 static HRESULT WINAPI IErrorInfoImpl_GetDescription(
 274         IErrorInfo* iface,
 275         BSTR *pBstrDescription)
 276 {
 277         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 278
 279         TRACE("(%p)->(pBstrDescription=%p)\n",This,pBstrDescription);
 280         if (pBstrDescription == NULL)
 281             return E_INVALIDARG;
 282         *pBstrDescription = ERRORINFO_SysAllocString(This->bstrDescription);
 283
 284         return S_OK;
 285 }
 286
 287 static HRESULT WINAPI IErrorInfoImpl_GetHelpFile(
 288         IErrorInfo* iface,
 289         BSTR *pBstrHelpFile)
 290 {
 291         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 292
 293         TRACE("(%p)->(pBstrHelpFile=%p)\n",This, pBstrHelpFile);
 294         if (pBstrHelpFile == NULL)
 295             return E_INVALIDARG;
 296         *pBstrHelpFile = ERRORINFO_SysAllocString(This->bstrHelpFile);
 297
 298         return S_OK;
 299 }
 300
 301 static HRESULT WINAPI IErrorInfoImpl_GetHelpContext(
 302         IErrorInfo* iface,
 303         DWORD *pdwHelpContext)
 304 {
 305         ErrorInfoImpl *This = impl_from_IErrorInfo(iface);
 306         TRACE("(%p)->(pdwHelpContext=%p)\n",This, pdwHelpContext);
 307         if (pdwHelpContext == NULL)
 308             return E_INVALIDARG;
 309         *pdwHelpContext = This->m_dwHelpContext;
 310
 311         return S_OK;
 312 }
 313
 314 static const IErrorInfoVtbl IErrorInfoImpl_VTable =
 315 {
 316   IErrorInfoImpl_QueryInterface,
 317   IErrorInfoImpl_AddRef,
 318   IErrorInfoImpl_Release,
 319
 320   IErrorInfoImpl_GetGUID,
 321   IErrorInfoImpl_GetSource,
 322   IErrorInfoImpl_GetDescription,
 323   IErrorInfoImpl_GetHelpFile,
 324   IErrorInfoImpl_GetHelpContext
 325 };
 326
 327
 328 static HRESULT WINAPI ICreateErrorInfoImpl_QueryInterface(
 329         ICreateErrorInfo* iface,
 330         REFIID     riid,
 331         VOID**     ppvoid)
 332 {
 333         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 334         TRACE("(%p)\n", This);
 335         return IErrorInfo_QueryInterface(_IErrorInfo_(This), riid, ppvoid);
 336 }
 337
 338 static ULONG WINAPI ICreateErrorInfoImpl_AddRef(
 339         ICreateErrorInfo* iface)
 340 {
 341         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 342         TRACE("(%p)\n", This);
 343         return IErrorInfo_AddRef(_IErrorInfo_(This));
 344 }
 345
 346 static ULONG WINAPI ICreateErrorInfoImpl_Release(
 347         ICreateErrorInfo* iface)
 348 {
 349         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 350         TRACE("(%p)\n", This);
 351         return IErrorInfo_Release(_IErrorInfo_(This));
 352 }
 353
 354
 355 static HRESULT WINAPI ICreateErrorInfoImpl_SetGUID(
 356         ICreateErrorInfo* iface,
 357         REFGUID rguid)
 358 {
 359         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 360         TRACE("(%p)->(%s)\n", This, debugstr_guid(rguid));
 361         memcpy(&This->m_Guid,  rguid, sizeof(GUID));
 362         return S_OK;
 363 }
 364
 365 static HRESULT WINAPI ICreateErrorInfoImpl_SetSource(
 366         ICreateErrorInfo* iface,
 367         LPOLESTR szSource)
 368 {
 369         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 370         TRACE("(%p): %s\n",This, debugstr_w(szSource));
 371         if (This->bstrSource != NULL)
 372             ERRORINFO_SysFreeString(This->bstrSource);
 373         This->bstrSource = ERRORINFO_SysAllocString(szSource);
 374
 375         return S_OK;
 376 }
 377
 378 static HRESULT WINAPI ICreateErrorInfoImpl_SetDescription(
 379         ICreateErrorInfo* iface,
 380         LPOLESTR szDescription)
 381 {
 382         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 383         TRACE("(%p): %s\n",This, debugstr_w(szDescription));
 384         if (This->bstrDescription != NULL)
 385             ERRORINFO_SysFreeString(This->bstrDescription);
 386         This->bstrDescription = ERRORINFO_SysAllocString(szDescription);
 387
 388         return S_OK;
 389 }
 390
 391 static HRESULT WINAPI ICreateErrorInfoImpl_SetHelpFile(
 392         ICreateErrorInfo* iface,
 393         LPOLESTR szHelpFile)
 394 {
 395         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 396         TRACE("(%p,%s)\n",This,debugstr_w(szHelpFile));
 397         if (This->bstrHelpFile != NULL)
 398             ERRORINFO_SysFreeString(This->bstrHelpFile);
 399         This->bstrHelpFile = ERRORINFO_SysAllocString(szHelpFile);
 400         return S_OK;
 401 }
 402
 403 static HRESULT WINAPI ICreateErrorInfoImpl_SetHelpContext(
 404         ICreateErrorInfo* iface,
 405         DWORD dwHelpContext)
 406 {
 407         ErrorInfoImpl *This = impl_from_ICreateErrorInfo(iface);
 408         TRACE("(%p,%ld)\n",This,dwHelpContext);
 409         This->m_dwHelpContext = dwHelpContext;
 410         return S_OK;
 411 }
 412
 413 static const ICreateErrorInfoVtbl ICreateErrorInfoImpl_VTable =
 414 {
 415   ICreateErrorInfoImpl_QueryInterface,
 416   ICreateErrorInfoImpl_AddRef,
 417   ICreateErrorInfoImpl_Release,
 418
 419   ICreateErrorInfoImpl_SetGUID,
 420   ICreateErrorInfoImpl_SetSource,
 421   ICreateErrorInfoImpl_SetDescription,
 422   ICreateErrorInfoImpl_SetHelpFile,
 423   ICreateErrorInfoImpl_SetHelpContext
 424 };
 425
 426 static HRESULT WINAPI ISupportErrorInfoImpl_QueryInterface(
 427         ISupportErrorInfo* iface,
 428         REFIID     riid,
 429         VOID**     ppvoid)
 430 {
 431         ErrorInfoImpl *This = impl_from_ISupportErrorInfo(iface);
 432         TRACE("(%p)\n", This);
 433
 434         return IErrorInfo_QueryInterface(_IErrorInfo_(This), riid, ppvoid);
 435 }
 436
 437 static ULONG WINAPI ISupportErrorInfoImpl_AddRef(
 438         ISupportErrorInfo* iface)
 439 {
 440         ErrorInfoImpl *This = impl_from_ISupportErrorInfo(iface);
 441         TRACE("(%p)\n", This);
 442         return IErrorInfo_AddRef(_IErrorInfo_(This));
 443 }
 444
 445 static ULONG WINAPI ISupportErrorInfoImpl_Release(
 446         ISupportErrorInfo* iface)
 447 {
 448         ErrorInfoImpl *This = impl_from_ISupportErrorInfo(iface);
 449         TRACE("(%p)\n", This);
 450         return IErrorInfo_Release(_IErrorInfo_(This));
 451 }
 452
 453
 454 static HRESULT WINAPI ISupportErrorInfoImpl_InterfaceSupportsErrorInfo(
 455         ISupportErrorInfo* iface,
 456         REFIID riid)
 457 {
 458         ErrorInfoImpl *This = impl_from_ISupportErrorInfo(iface);
 459         TRACE("(%p)->(%s)\n", This, debugstr_guid(riid));
 460         return (IsEqualIID(riid, &This->m_Guid)) ? S_OK : S_FALSE;
 461 }
 462
 463 static const ISupportErrorInfoVtbl ISupportErrorInfoImpl_VTable =
 464 {
 465   ISupportErrorInfoImpl_QueryInterface,
 466   ISupportErrorInfoImpl_AddRef,
 467   ISupportErrorInfoImpl_Release,
 468
 469
 470   ISupportErrorInfoImpl_InterfaceSupportsErrorInfo
 471 };
 472 /***********************************************************************
 473  *              CreateErrorInfo (OLE32.@)
 474  */
 475 HRESULT WINAPI CreateErrorInfo(ICreateErrorInfo **pperrinfo)
 476 {
 477         IErrorInfo * pei;
 478         HRESULT res;
 479         TRACE("(%p): stub:\n", pperrinfo);
 480         if(! pperrinfo ) return E_INVALIDARG;
 481         if(!(pei=IErrorInfoImpl_Constructor()))return E_OUTOFMEMORY;
 482
 483         res = IErrorInfo_QueryInterface(pei, &IID_ICreateErrorInfo, (LPVOID*)pperrinfo);
 484         IErrorInfo_Release(pei);
 485         return res;
 486 }
 487
 488 /***********************************************************************
 489  *              GetErrorInfo (OLE32.@)
 490  */
 491 HRESULT WINAPI GetErrorInfo(ULONG dwReserved, IErrorInfo **pperrinfo)
 492 {
 493         TRACE("(%ld, %p, %p)\n", dwReserved, pperrinfo, COM_CurrentInfo()->errorinfo);
 494
 495         if(!pperrinfo) return E_INVALIDARG;
 496
 497         if (!COM_CurrentInfo()->errorinfo)
 498         {
 499            *pperrinfo = NULL;
 500            return S_FALSE;
 501         }
 502
 503         *pperrinfo = COM_CurrentInfo()->errorinfo;
 504
 505         /* clear thread error state */
 506         COM_CurrentInfo()->errorinfo = NULL;
 507         return S_OK;
 508 }
 509
 510 /***********************************************************************
 511  *              SetErrorInfo (OLE32.@)
 512  */
 513 HRESULT WINAPI SetErrorInfo(ULONG dwReserved, IErrorInfo *perrinfo)
 514 {
 515         IErrorInfo * pei;
 516
 517         TRACE("(%ld, %p)\n", dwReserved, perrinfo);
 518
 519         /* release old errorinfo */
 520         pei = COM_CurrentInfo()->errorinfo;
 521         if (pei) IErrorInfo_Release(pei);
 522
 523         /* set to new value */
 524         COM_CurrentInfo()->errorinfo = perrinfo;
 525         if (perrinfo) IErrorInfo_AddRef(perrinfo);
 526
 527         return S_OK;
 528 }