dlls/shell32/shlfolder.c

   1 /*
   2  *      Shell Folder stuff
   3  *
   4  *      Copyright 1997                  Marcus Meissner
   5  *      Copyright 1998, 1999, 2002      Juergen Schmied
   6  *
   7  *      IShellFolder2 and related interfaces
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include "config.h"
  25 #include "wine/port.h"
  26
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <stdarg.h>
  30 #include <stdio.h>
  31
  32 #define COBJMACROS
  33
  34 #include "winerror.h"
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "winreg.h"
  38 #include "wingdi.h"
  39 #include "winuser.h"
  40
  41 #include "ole2.h"
  42 #include "shlguid.h"
  43
  44 #include "pidl.h"
  45 #include "undocshell.h"
  46 #include "shell32_main.h"
  47 #include "shlwapi.h"
  48 #include "wine/debug.h"
  49 #include "shfldr.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL (shell);
  52
  53 static const WCHAR wszDotShellClassInfo[] = {
  54     '.','S','h','e','l','l','C','l','a','s','s','I','n','f','o',0};
  55
  56 /***************************************************************************
  57  *  SHELL32_GetCustomFolderAttribute (internal function)
  58  *
  59  * Gets a value from the folder's desktop.ini file, if one exists.
  60  *
  61  * PARAMETERS
  62  *  pidl          [I] Folder containing the desktop.ini file.
  63  *  pwszHeading   [I] Heading in .ini file.
  64  *  pwszAttribute [I] Attribute in .ini file.
  65  *  pwszValue     [O] Buffer to store value into.
  66  *  cchValue      [I] Size in characters including NULL of buffer pointed to
  67  *                    by pwszValue.
  68  *
  69  *  RETURNS
  70  *    TRUE if returned non-NULL value.
  71  *    FALSE otherwise.
  72  */
  73 static inline BOOL SHELL32_GetCustomFolderAttributeFromPath(
  74     LPWSTR pwszFolderPath, LPCWSTR pwszHeading, LPCWSTR pwszAttribute,
  75     LPWSTR pwszValue, DWORD cchValue)
  76 {
  77     static const WCHAR wszDesktopIni[] =
  78             {'d','e','s','k','t','o','p','.','i','n','i',0};
  79     static const WCHAR wszDefault[] = {0};
  80
  81     PathAddBackslashW(pwszFolderPath);
  82     PathAppendW(pwszFolderPath, wszDesktopIni);
  83     return GetPrivateProfileStringW(pwszHeading, pwszAttribute, wszDefault,
  84                                     pwszValue, cchValue, pwszFolderPath);
  85 }
  86
  87 BOOL SHELL32_GetCustomFolderAttribute(
  88     LPCITEMIDLIST pidl, LPCWSTR pwszHeading, LPCWSTR pwszAttribute,
  89     LPWSTR pwszValue, DWORD cchValue)
  90 {
  91     DWORD dwAttrib = FILE_ATTRIBUTE_SYSTEM;
  92     WCHAR wszFolderPath[MAX_PATH];
  93
  94     /* Hack around not having system attribute on non-Windows file systems */
  95     if (0)
  96         dwAttrib = _ILGetFileAttributes(pidl, NULL, 0);
  97
  98     if (dwAttrib & FILE_ATTRIBUTE_SYSTEM)
  99     {
 100         if (!SHGetPathFromIDListW(pidl, wszFolderPath))
 101             return FALSE;
 102
 103         return SHELL32_GetCustomFolderAttributeFromPath(wszFolderPath, pwszHeading,
 104                                                 pwszAttribute, pwszValue, cchValue);
 105     }
 106     return FALSE;
 107 }
 108
 109 /***************************************************************************
 110  *  GetNextElement (internal function)
 111  *
 112  * gets a part of a string till the first backslash
 113  *
 114  * PARAMETERS
 115  *  pszNext [IN] string to get the element from
 116  *  pszOut  [IN] pointer to buffer whitch receives string
 117  *  dwOut   [IN] length of pszOut
 118  *
 119  *  RETURNS
 120  *    LPSTR pointer to first, not yet parsed char
 121  */
 122
 123 LPCWSTR GetNextElementW (LPCWSTR pszNext, LPWSTR pszOut, DWORD dwOut)
 124 {
 125     LPCWSTR pszTail = pszNext;
 126     DWORD dwCopy;
 127
 128     TRACE ("(%s %p 0x%08lx)\n", debugstr_w (pszNext), pszOut, dwOut);
 129
 130     *pszOut = 0x0000;
 131
 132     if (!pszNext || !*pszNext)
 133         return NULL;
 134
 135     while (*pszTail && (*pszTail != (WCHAR) '\\'))
 136         pszTail++;
 137
 138     dwCopy = (const WCHAR *) pszTail - (const WCHAR *) pszNext + 1;
 139     lstrcpynW (pszOut, pszNext, (dwOut < dwCopy) ? dwOut : dwCopy);
 140
 141     if (*pszTail)
 142         pszTail++;
 143     else
 144         pszTail = NULL;
 145
 146     TRACE ("--(%s %s 0x%08lx %p)\n", debugstr_w (pszNext), debugstr_w (pszOut), dwOut, pszTail);
 147     return pszTail;
 148 }
 149
 150 HRESULT SHELL32_ParseNextElement (IShellFolder2 * psf, HWND hwndOwner, LPBC pbc,
 151                                   LPITEMIDLIST * pidlInOut, LPOLESTR szNext, DWORD * pEaten, DWORD * pdwAttributes)
 152 {
 153     HRESULT hr = E_INVALIDARG;
 154     LPITEMIDLIST pidlOut = NULL,
 155       pidlTemp = NULL;
 156     IShellFolder *psfChild;
 157
 158     TRACE ("(%p, %p, %p, %s)\n", psf, pbc, pidlInOut ? *pidlInOut : NULL, debugstr_w (szNext));
 159
 160     /* get the shellfolder for the child pidl and let it analyse further */
 161     hr = IShellFolder_BindToObject (psf, *pidlInOut, pbc, &IID_IShellFolder, (LPVOID *) & psfChild);
 162
 163     if (SUCCEEDED(hr)) {
 164         hr = IShellFolder_ParseDisplayName (psfChild, hwndOwner, pbc, szNext, pEaten, &pidlOut, pdwAttributes);
 165         IShellFolder_Release (psfChild);
 166
 167         if (SUCCEEDED(hr)) {
 168             pidlTemp = ILCombine (*pidlInOut, pidlOut);
 169
 170             if (!pidlTemp)
 171                 hr = E_OUTOFMEMORY;
 172         }
 173
 174         if (pidlOut)
 175             ILFree (pidlOut);
 176     }
 177
 178     ILFree (*pidlInOut);
 179     *pidlInOut = pidlTemp;
 180
 181     TRACE ("-- pidl=%p ret=0x%08lx\n", pidlInOut ? *pidlInOut : NULL, hr);
 182     return hr;
 183 }
 184
 185 /***********************************************************************
 186  *      SHELL32_CoCreateInitSF
 187  *
 188  * Creates a shell folder and initializes it with a pidl and a root folder
 189  * via IPersistFolder3 or IPersistFolder.
 190  *
 191  * NOTES
 192  *   pathRoot can be NULL for Folders beeing a drive.
 193  *   In this case the absolute path is build from pidlChild (eg. C:)
 194  */
 195 HRESULT SHELL32_CoCreateInitSF (LPCITEMIDLIST pidlRoot, LPCSTR pathRoot,
 196     LPCITEMIDLIST pidlChild, REFCLSID clsid, REFIID riid, LPVOID * ppvOut)
 197 {
 198     HRESULT hr;
 199
 200     TRACE ("%p %s %p\n", pidlRoot, pathRoot, pidlChild);
 201
 202     if (SUCCEEDED ((hr = SHCoCreateInstance (NULL, clsid, NULL, riid, ppvOut)))) {
 203         LPITEMIDLIST pidlAbsolute = ILCombine (pidlRoot, pidlChild);
 204         IPersistFolder *pPF;
 205         IPersistFolder3 *ppf;
 206
 207         if (_ILIsFolder(pidlChild) &&
 208             SUCCEEDED (IUnknown_QueryInterface ((IUnknown *) * ppvOut, &IID_IPersistFolder3, (LPVOID *) & ppf)))
 209         {
 210             PERSIST_FOLDER_TARGET_INFO ppfti;
 211             char szDestPath[MAX_PATH];
 212
 213             ZeroMemory (&ppfti, sizeof (ppfti));
 214
 215             /* build path */
 216             if (pathRoot) {
 217                 lstrcpyA (szDestPath, pathRoot);
 218                 PathAddBackslashA(szDestPath);          /* FIXME: why have drives a backslash here ? */
 219             } else {
 220                 szDestPath[0] = '\0';
 221             }
 222
 223             if (pidlChild) {
 224                 LPSTR pszChild = _ILGetTextPointer(pidlChild);
 225
 226                 if (pszChild)
 227                     lstrcatA (szDestPath, pszChild);
 228                 else
 229                     hr = E_INVALIDARG;
 230             }
 231
 232             /* fill the PERSIST_FOLDER_TARGET_INFO */
 233             ppfti.dwAttributes = -1;
 234             ppfti.csidl = -1;
 235             MultiByteToWideChar (CP_ACP, 0, szDestPath, -1, ppfti.szTargetParsingName, MAX_PATH);
 236
 237             IPersistFolder3_InitializeEx (ppf, NULL, pidlAbsolute, &ppfti);
 238             IPersistFolder3_Release (ppf);
 239         }
 240         else if (SUCCEEDED ((hr = IUnknown_QueryInterface ((IUnknown *) * ppvOut, &IID_IPersistFolder, (LPVOID *) & pPF)))) {
 241             IPersistFolder_Initialize (pPF, pidlAbsolute);
 242             IPersistFolder_Release (pPF);
 243         }
 244         ILFree (pidlAbsolute);
 245     }
 246     TRACE ("-- (%p) ret=0x%08lx\n", *ppvOut, hr);
 247     return hr;
 248 }
 249
 250 /***********************************************************************
 251  *      SHELL32_BindToChild [Internal]
 252  *
 253  * Common code for IShellFolder_BindToObject.
 254  *
 255  * PARAMS
 256  *  pidlRoot     [I] The parent shell folder's absolute pidl.
 257  *  pathRoot     [I] Absolute dos path of the parent shell folder.
 258  *  pidlComplete [I] PIDL of the child. Relative to pidlRoot.
 259  *  riid         [I] GUID of the interface, which ppvOut shall be bound to.
 260  *  ppvOut       [O] A reference to the child's interface (riid).
 261  *
 262  * NOTES
 263  *  pidlComplete has to contain at least one non empty SHITEMID.
 264  *  This function makes special assumptions on the shell namespace, which
 265  *  means you probably can't use it for your IShellFolder implementation.
 266  */
 267 HRESULT SHELL32_BindToChild (LPCITEMIDLIST pidlRoot,
 268                              LPCSTR pathRoot, LPCITEMIDLIST pidlComplete, REFIID riid, LPVOID * ppvOut)
 269 {
 270     GUID const *clsid;
 271     IShellFolder *pSF;
 272     HRESULT hr;
 273     LPITEMIDLIST pidlChild;
 274
 275     if (!pidlRoot || !ppvOut || !pidlComplete || !pidlComplete->mkid.cb)
 276         return E_INVALIDARG;
 277
 278     *ppvOut = NULL;
 279
 280     pidlChild = ILCloneFirst (pidlComplete);
 281
 282     if ((clsid = _ILGetGUIDPointer (pidlChild))) {
 283         /* virtual folder */
 284         hr = SHELL32_CoCreateInitSF (pidlRoot, pathRoot, pidlChild, clsid, &IID_IShellFolder, (LPVOID *) & pSF);
 285     } else {
 286         /* file system folder */
 287         CLSID clsidFolder = CLSID_ShellFSFolder;
 288         static const WCHAR wszCLSID[] = {'C','L','S','I','D',0};
 289         WCHAR wszCLSIDValue[CHARS_IN_GUID], wszFolderPath[MAX_PATH], *pwszPathTail = wszFolderPath;
 290
 291         /* see if folder CLSID should be overridden by desktop.ini file */
 292         if (pathRoot) {
 293             MultiByteToWideChar(CP_ACP, 0, pathRoot, -1, wszFolderPath, MAX_PATH);
 294             pwszPathTail = PathAddBackslashW(wszFolderPath);
 295         }
 296         MultiByteToWideChar(CP_ACP, 0, _ILGetTextPointer(pidlChild), -1, pwszPathTail, MAX_PATH);
 297         if (SHELL32_GetCustomFolderAttributeFromPath (wszFolderPath,
 298             wszDotShellClassInfo, wszCLSID, wszCLSIDValue, CHARS_IN_GUID))
 299             CLSIDFromString (wszCLSIDValue, &clsidFolder);
 300
 301                 hr = SHELL32_CoCreateInitSF (pidlRoot, pathRoot, pidlChild,
 302             &clsidFolder, &IID_IShellFolder, (LPVOID *)&pSF);
 303     }
 304     ILFree (pidlChild);
 305
 306     if (SUCCEEDED (hr)) {
 307         if (_ILIsPidlSimple (pidlComplete)) {
 308             /* no sub folders */
 309             hr = IShellFolder_QueryInterface (pSF, riid, ppvOut);
 310         } else {
 311             /* go deeper */
 312             hr = IShellFolder_BindToObject (pSF, ILGetNext (pidlComplete), NULL, riid, ppvOut);
 313         }
 314         IShellFolder_Release (pSF);
 315     }
 316
 317     TRACE ("-- returning (%p) %08lx\n", *ppvOut, hr);
 318
 319     return hr;
 320 }
 321
 322 /***********************************************************************
 323  *      SHELL32_GetDisplayNameOfChild
 324  *
 325  * Retrives the display name of a child object of a shellfolder.
 326  *
 327  * For a pidl eg. [subpidl1][subpidl2][subpidl3]:
 328  * - it binds to the child shellfolder [subpidl1]
 329  * - asks it for the displayname of [subpidl2][subpidl3]
 330  *
 331  * Is possible the pidl is a simple pidl. In this case it asks the
 332  * subfolder for the displayname of an empty pidl. The subfolder
 333  * returns the own displayname eg. "::{guid}". This is used for
 334  * virtual folders with the registry key WantsFORPARSING set.
 335  */
 336 HRESULT SHELL32_GetDisplayNameOfChild (IShellFolder2 * psf,
 337                                        LPCITEMIDLIST pidl, DWORD dwFlags, LPSTR szOut, DWORD dwOutLen)
 338 {
 339     LPITEMIDLIST pidlFirst;
 340     HRESULT hr = E_INVALIDARG;
 341
 342     TRACE ("(%p)->(pidl=%p 0x%08lx %p 0x%08lx)\n", psf, pidl, dwFlags, szOut, dwOutLen);
 343     pdump (pidl);
 344
 345     pidlFirst = ILCloneFirst (pidl);
 346     if (pidlFirst) {
 347         IShellFolder2 *psfChild;
 348
 349         hr = IShellFolder_BindToObject (psf, pidlFirst, NULL, &IID_IShellFolder, (LPVOID *) & psfChild);
 350         if (SUCCEEDED (hr)) {
 351             STRRET strTemp;
 352             LPITEMIDLIST pidlNext = ILGetNext (pidl);
 353
 354             hr = IShellFolder_GetDisplayNameOf (psfChild, pidlNext, dwFlags, &strTemp);
 355             if (SUCCEEDED (hr)) {
 356                 hr = StrRetToStrNA (szOut, dwOutLen, &strTemp, pidlNext);
 357             }
 358             IShellFolder_Release (psfChild);
 359         }
 360         ILFree (pidlFirst);
 361     } else
 362         hr = E_OUTOFMEMORY;
 363
 364     TRACE ("-- ret=0x%08lx %s\n", hr, szOut);
 365
 366     return hr;
 367 }
 368
 369 /***********************************************************************
 370  *  SHELL32_GetItemAttributes
 371  *
 372  * NOTES
 373  * observerd values:
 374  *  folder:     0xE0000177      FILESYSTEM | HASSUBFOLDER | FOLDER
 375  *  file:       0x40000177      FILESYSTEM
 376  *  drive:      0xf0000144      FILESYSTEM | HASSUBFOLDER | FOLDER | FILESYSANCESTOR
 377  *  mycomputer: 0xb0000154      HASSUBFOLDER | FOLDER | FILESYSANCESTOR
 378  *  (seems to be default for shell extensions if no registry entry exists)
 379  *
 380  * win2k:
 381  *  folder:    0xF0400177      FILESYSTEM | HASSUBFOLDER | FOLDER | FILESYSANCESTOR | CANMONIKER
 382  *  file:      0x40400177      FILESYSTEM | CANMONIKER
 383  *  drive      0xF0400154      FILESYSTEM | HASSUBFOLDER | FOLDER | FILESYSANCESTOR | CANMONIKER | CANRENAME (LABEL)
 384  *
 385  * This function does not set flags!! It only resets flags when necessary.
 386  */
 387 HRESULT SHELL32_GetItemAttributes (IShellFolder * psf, LPCITEMIDLIST pidl, LPDWORD pdwAttributes)
 388 {
 389     DWORD dwAttributes;
 390     static const DWORD dwSupportedAttr=
 391                           SFGAO_CANCOPY |           /*0x00000001 */
 392                           SFGAO_CANMOVE |           /*0x00000002 */
 393                           SFGAO_CANLINK |           /*0x00000004 */
 394                           SFGAO_CANRENAME |         /*0x00000010 */
 395                           SFGAO_CANDELETE |         /*0x00000020 */
 396                           SFGAO_HASPROPSHEET |      /*0x00000040 */
 397                           SFGAO_DROPTARGET |        /*0x00000100 */
 398                           SFGAO_LINK |              /*0x00010000 */
 399                           SFGAO_READONLY |          /*0x00040000 */
 400                           SFGAO_HIDDEN |            /*0x00080000 */
 401                           SFGAO_FILESYSANCESTOR |   /*0x10000000 */
 402                           SFGAO_FOLDER |            /*0x20000000 */
 403                           SFGAO_FILESYSTEM |        /*0x40000000 */
 404                           SFGAO_HASSUBFOLDER;       /*0x80000000 */
 405
 406     TRACE ("0x%08lx\n", *pdwAttributes);
 407
 408     if (*pdwAttributes & ~dwSupportedAttr)
 409     {
 410         WARN ("attributes 0x%08lx not implemented\n", (*pdwAttributes & ~dwSupportedAttr));
 411         *pdwAttributes &= dwSupportedAttr;
 412     }
 413
 414     if (_ILIsDrive (pidl)) {
 415         *pdwAttributes &= SFGAO_HASSUBFOLDER|SFGAO_FILESYSTEM|SFGAO_FOLDER|SFGAO_FILESYSANCESTOR|
 416             SFGAO_DROPTARGET|SFGAO_HASPROPSHEET|SFGAO_CANLINK;
 417     } else if (_ILGetGUIDPointer (pidl)) {
 418         if (!HCR_GetFolderAttributes (pidl, pdwAttributes)) {
 419             *pdwAttributes &= SFGAO_HASSUBFOLDER|SFGAO_FOLDER|SFGAO_FILESYSANCESTOR|
 420                 SFGAO_DROPTARGET|SFGAO_HASPROPSHEET|SFGAO_CANRENAME|SFGAO_CANLINK;
 421         }
 422     } else if (_ILGetDataPointer (pidl)) {
 423         dwAttributes = _ILGetFileAttributes (pidl, NULL, 0);
 424
 425         if ((SFGAO_FILESYSANCESTOR & *pdwAttributes) && !(dwAttributes & FILE_ATTRIBUTE_DIRECTORY))
 426             *pdwAttributes &= ~SFGAO_FILESYSANCESTOR;
 427
 428         if ((SFGAO_FOLDER & *pdwAttributes) && !(dwAttributes & FILE_ATTRIBUTE_DIRECTORY))
 429             *pdwAttributes &= ~(SFGAO_FOLDER | SFGAO_HASSUBFOLDER);
 430
 431         if ((SFGAO_HIDDEN & *pdwAttributes) && !(dwAttributes & FILE_ATTRIBUTE_HIDDEN))
 432             *pdwAttributes &= ~SFGAO_HIDDEN;
 433
 434         if ((SFGAO_READONLY & *pdwAttributes) && !(dwAttributes & FILE_ATTRIBUTE_READONLY))
 435             *pdwAttributes &= ~SFGAO_READONLY;
 436
 437         if (SFGAO_LINK & *pdwAttributes) {
 438             char ext[MAX_PATH];
 439
 440             if (!_ILGetExtension(pidl, ext, MAX_PATH) || lstrcmpiA(ext, "lnk"))
 441                 *pdwAttributes &= ~SFGAO_LINK;
 442         }
 443
 444         if (SFGAO_HASSUBFOLDER & *pdwAttributes)
 445         {
 446             IShellFolder *psf2;
 447             if (SUCCEEDED(IShellFolder_BindToObject(psf, pidl, 0, (REFIID)&IID_IShellFolder, (LPVOID *)&psf2)))
 448             {
 449                 IEnumIDList     *pEnumIL = NULL;
 450                 if (SUCCEEDED(IShellFolder_EnumObjects(psf2, 0, SHCONTF_FOLDERS, &pEnumIL)))
 451                 {
 452                     if (IEnumIDList_Skip(pEnumIL, 1) != S_OK)
 453                         *pdwAttributes &= ~SFGAO_HASSUBFOLDER;
 454                     IEnumIDList_Release(pEnumIL);
 455                 }
 456                 IShellFolder_Release(psf2);
 457             }
 458         }
 459     } else {
 460         *pdwAttributes &= SFGAO_HASSUBFOLDER|SFGAO_FOLDER|SFGAO_FILESYSANCESTOR|SFGAO_DROPTARGET|SFGAO_HASPROPSHEET|SFGAO_CANRENAME|SFGAO_CANLINK;
 461     }
 462     TRACE ("-- 0x%08lx\n", *pdwAttributes);
 463     return S_OK;
 464 }
 465
 466 /***********************************************************************
 467  *  SHELL32_CompareIDs
 468  */
 469 HRESULT SHELL32_CompareIDs (IShellFolder * iface, LPARAM lParam, LPCITEMIDLIST pidl1, LPCITEMIDLIST pidl2)
 470 {
 471     int type1,
 472       type2;
 473     char szTemp1[MAX_PATH];
 474     char szTemp2[MAX_PATH];
 475     HRESULT nReturn;
 476     LPITEMIDLIST firstpidl,
 477       nextpidl1,
 478       nextpidl2;
 479     IShellFolder *psf;
 480
 481     /* test for empty pidls */
 482     BOOL isEmpty1 = _ILIsDesktop (pidl1);
 483     BOOL isEmpty2 = _ILIsDesktop (pidl2);
 484
 485     if (isEmpty1 && isEmpty2)
 486         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, 0 );
 487     if (isEmpty1)
 488         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, (WORD)-1 );
 489     if (isEmpty2)
 490         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, 1 );
 491
 492     /* test for different types. Sort order is the PT_* constant */
 493     type1 = _ILGetDataPointer (pidl1)->type;
 494     type2 = _ILGetDataPointer (pidl2)->type;
 495     if (type1 < type2)
 496         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, (WORD)-1 );
 497     else if (type1 > type2)
 498         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, 1 );
 499
 500     /* test for name of pidl */
 501     _ILSimpleGetText (pidl1, szTemp1, MAX_PATH);
 502     _ILSimpleGetText (pidl2, szTemp2, MAX_PATH);
 503     nReturn = lstrcmpiA (szTemp1, szTemp2);
 504     if (nReturn < 0)
 505         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, (WORD)-1 );
 506     else if (nReturn > 0)
 507         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, 1 );
 508
 509     /* test of complex pidls */
 510     firstpidl = ILCloneFirst (pidl1);
 511     nextpidl1 = ILGetNext (pidl1);
 512     nextpidl2 = ILGetNext (pidl2);
 513
 514     /* optimizing: test special cases and bind not deeper */
 515     /* the deeper shellfolder would do the same */
 516     isEmpty1 = _ILIsDesktop (nextpidl1);
 517     isEmpty2 = _ILIsDesktop (nextpidl2);
 518
 519     if (isEmpty1 && isEmpty2) {
 520         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, 0 );
 521     } else if (isEmpty1) {
 522         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, (WORD)-1 );
 523     } else if (isEmpty2) {
 524         return MAKE_HRESULT( SEVERITY_SUCCESS, 0, 1 );
 525     /* optimizing end */
 526     } else if (SUCCEEDED (IShellFolder_BindToObject (iface, firstpidl, NULL, &IID_IShellFolder, (LPVOID *) & psf))) {
 527         nReturn = IShellFolder_CompareIDs (psf, lParam, nextpidl1, nextpidl2);
 528         IShellFolder_Release (psf);
 529     }
 530     ILFree (firstpidl);
 531     return nReturn;
 532 }
 533
 534 /***********************************************************************
 535  *  SHCreateLinks
 536  *
 537  *   Undocumented.
 538  */
 539 HRESULT WINAPI SHCreateLinks( HWND hWnd, LPCSTR lpszDir, LPDATAOBJECT lpDataObject,
 540                               UINT uFlags, LPITEMIDLIST *lppidlLinks)
 541 {
 542     FIXME("%p %s %p %08x %p\n",hWnd,lpszDir,lpDataObject,uFlags,lppidlLinks);
 543     return E_NOTIMPL;
 544 }