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