src/msw/regconf.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/regconf.cpp
   3 // Purpose:
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     27.04.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13 #pragma implementation "regconf.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24   #include  "wx/string.h"
  25   #include  "wx/intl.h"
  26 #endif //WX_PRECOMP
  27
  28 #include "wx/event.h"
  29 #include "wx/app.h"
  30 #include "wx/log.h"
  31
  32 #if wxUSE_CONFIG
  33
  34 #include "wx/config.h"
  35
  36 #ifndef __WIN16__
  37
  38 #include "wx/msw/registry.h"
  39 #include "wx/msw/regconf.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // constants
  43 // ----------------------------------------------------------------------------
  44
  45 // we put our data in HKLM\SOFTWARE_KEY\appname
  46 #define SOFTWARE_KEY    wxString(wxT("Software\\"))
  47
  48 // ----------------------------------------------------------------------------
  49 // global functions
  50 // ----------------------------------------------------------------------------
  51
  52 // get the value if the key is opened and it exists
  53 bool TryGetValue(const wxRegKey& key, const wxString& str, wxString& strVal)
  54 {
  55   return key.IsOpened() && key.HasValue(str) && key.QueryValue(str, strVal);
  56 }
  57
  58 bool TryGetValue(const wxRegKey& key, const wxString& str, long *plVal)
  59 {
  60   return key.IsOpened() && key.HasValue(str) && key.QueryValue(str, plVal);
  61 }
  62
  63 // ============================================================================
  64 // implementation
  65 // ============================================================================
  66
  67 // ----------------------------------------------------------------------------
  68 // ctor/dtor
  69 // ----------------------------------------------------------------------------
  70
  71 // create the config object which stores its data under HKCU\vendor\app and, if
  72 // style & wxCONFIG_USE_GLOBAL_FILE, under HKLM\vendor\app
  73 wxRegConfig::wxRegConfig(const wxString& appName, const wxString& vendorName,
  74                          const wxString& strLocal, const wxString& strGlobal,
  75                          long style)
  76            : wxConfigBase(appName, vendorName, strLocal, strGlobal, style)
  77 {
  78   wxString strRoot;
  79
  80   bool bDoUseGlobal = (style & wxCONFIG_USE_GLOBAL_FILE) != 0;
  81
  82   // the convention is to put the programs keys under <vendor>\<appname>
  83   // (but it can be overriden by specifying the pathes explicitly in strLocal
  84   // and/or strGlobal)
  85   if ( strLocal.IsEmpty() || (strGlobal.IsEmpty() && bDoUseGlobal) )
  86   {
  87     if ( vendorName.IsEmpty() )
  88     {
  89       if ( wxTheApp )
  90         strRoot = wxTheApp->GetVendorName();
  91     }
  92     else
  93     {
  94       strRoot = vendorName;
  95     }
  96
  97     // no '\\' needed if no vendor name
  98     if ( !strRoot.IsEmpty() )
  99     {
 100       strRoot += '\\';
 101     }
 102
 103     if ( appName.IsEmpty() )
 104     {
 105       wxCHECK_RET( wxTheApp, wxT("No application name in wxRegConfig ctor!") );
 106       strRoot << wxTheApp->GetAppName();
 107     }
 108     else
 109     {
 110       strRoot << appName;
 111     }
 112   }
 113   //else: we don't need to do all the complicated stuff above
 114
 115   wxString str = strLocal.IsEmpty() ? strRoot : strLocal;
 116
 117   // as we're going to change the name of these keys fairly often and as
 118   // there are only few of wxRegConfig objects (usually 1), we can allow
 119   // ourselves to be generous and spend some memory to significantly improve
 120   // performance of SetPath()
 121   static const size_t MEMORY_PREALLOC = 512;
 122
 123   m_keyLocalRoot.ReserveMemoryForName(MEMORY_PREALLOC);
 124   m_keyLocal.ReserveMemoryForName(MEMORY_PREALLOC);
 125
 126   m_keyLocalRoot.SetName(wxRegKey::HKCU, SOFTWARE_KEY + str);
 127   m_keyLocal.SetName(m_keyLocalRoot, wxEmptyString);
 128
 129   if ( bDoUseGlobal )
 130   {
 131     str = strGlobal.IsEmpty() ? strRoot : strGlobal;
 132
 133     m_keyGlobalRoot.ReserveMemoryForName(MEMORY_PREALLOC);
 134     m_keyGlobal.ReserveMemoryForName(MEMORY_PREALLOC);
 135
 136     m_keyGlobalRoot.SetName(wxRegKey::HKLM, SOFTWARE_KEY + str);
 137     m_keyGlobal.SetName(m_keyGlobalRoot, wxEmptyString);
 138   }
 139
 140   // Create() will Open() if key already exists
 141   m_keyLocalRoot.Create();
 142
 143   // as it's the same key, Open() shouldn't fail (i.e. no need for Create())
 144   m_keyLocal.Open();
 145
 146   // OTOH, this key may perfectly not exist, so suppress error messages the call
 147   // to Open() might generate
 148   if ( bDoUseGlobal )
 149   {
 150     wxLogNull nolog;
 151     m_keyGlobalRoot.Open(wxRegKey::Read);
 152     m_keyGlobal.Open(wxRegKey::Read);
 153   }
 154 }
 155
 156 wxRegConfig::~wxRegConfig()
 157 {
 158   // nothing to do - key will be closed in their dtors
 159 }
 160
 161 // ----------------------------------------------------------------------------
 162 // path management
 163 // ----------------------------------------------------------------------------
 164
 165 // this function is called a *lot* of times (as I learned after seeing from
 166 // profiler output that it is called ~12000 times from Mahogany start up code!)
 167 // so it is important to optimize it - in particular, avoid using generic
 168 // string functions here and do everything manually because it is faster
 169 //
 170 // I still kept the old version to be able to check that the optimized code has
 171 // the same output as the non optimized version.
 172 void wxRegConfig::SetPath(const wxString& strPath)
 173 {
 174     // remember the old path
 175     wxString strOldPath = m_strPath;
 176
 177 #ifdef WX_DEBUG_SET_PATH // non optimized version kept here for testing
 178     wxString m_strPathAlt;
 179
 180     {
 181         wxArrayString aParts;
 182
 183         // because GetPath() returns "" when we're at root, we must understand
 184         // empty string as "/"
 185         if ( strPath.IsEmpty() || (strPath[0] == wxCONFIG_PATH_SEPARATOR) ) {
 186             // absolute path
 187             wxSplitPath(aParts, strPath);
 188         }
 189         else {
 190             // relative path, combine with current one
 191             wxString strFullPath = GetPath();
 192             strFullPath << wxCONFIG_PATH_SEPARATOR << strPath;
 193             wxSplitPath(aParts, strFullPath);
 194         }
 195
 196         // recombine path parts in one variable
 197         wxString strRegPath;
 198         m_strPathAlt.Empty();
 199         for ( size_t n = 0; n < aParts.Count(); n++ ) {
 200             strRegPath << '\\' << aParts[n];
 201             m_strPathAlt << wxCONFIG_PATH_SEPARATOR << aParts[n];
 202         }
 203     }
 204 #endif // 0
 205
 206     // check for the most common case first
 207     if ( strPath.empty() )
 208     {
 209         m_strPath = wxCONFIG_PATH_SEPARATOR;
 210     }
 211     else // not root
 212     {
 213         // construct the full path
 214         wxString strFullPath;
 215         if ( strPath[0u] == wxCONFIG_PATH_SEPARATOR )
 216         {
 217             // absolute path
 218             strFullPath = strPath;
 219         }
 220         else // relative path
 221         {
 222             strFullPath.reserve(2*m_strPath.length());
 223
 224             strFullPath << m_strPath;
 225             if ( strFullPath.Len() == 0 ||
 226                  strFullPath.Last() != wxCONFIG_PATH_SEPARATOR )
 227                 strFullPath << wxCONFIG_PATH_SEPARATOR;
 228             strFullPath << strPath;
 229         }
 230
 231         // simplify it: we need to handle ".." here
 232
 233         // count the total number of slashes we have to know if we can go upper
 234         size_t totalSlashes = 0;
 235
 236         // position of the last slash to be able to backtrack to it quickly if
 237         // needed, but we set it to -1 if we don't have a valid position
 238         //
 239         // we only remember the last position which means that we handle ".."
 240         // quite efficiently but not "../.." - however the latter should be
 241         // much more rare, so it is probably ok
 242         int posLastSlash = -1;
 243
 244         const wxChar *src = strFullPath.c_str();
 245         size_t len = strFullPath.length();
 246         const wxChar *end = src + len;
 247
 248         wxStringBufferLength buf(m_strPath, len);
 249         wxChar *dst = buf;
 250         wxChar *start = dst;
 251
 252         for ( ; src < end; src++, dst++ )
 253         {
 254             if ( *src == wxCONFIG_PATH_SEPARATOR )
 255             {
 256                 // check for "/.."
 257
 258                 // note that we don't have to check for src < end here as
 259                 // *end == 0 so can't be '.'
 260                 if ( src[1] == _T('.') && src[2] == _T('.') &&
 261                      (src + 3 == end || src[3] == wxCONFIG_PATH_SEPARATOR) )
 262                 {
 263                     if ( !totalSlashes )
 264                     {
 265                         wxLogWarning(_("'%s' has extra '..', ignored."),
 266                                      strFullPath.c_str());
 267                     }
 268                     else // return to the previous path component
 269                     {
 270                         // do we already have its position?
 271                         if ( posLastSlash == -1 )
 272                         {
 273                             // no, find it: note that we are sure to have one
 274                             // because totalSlashes > 0 so we don't have to
 275                             // check the boundary condition below
 276
 277                             // this is more efficient than strrchr()
 278                             dst--;
 279                             while ( *dst != wxCONFIG_PATH_SEPARATOR )
 280                             {
 281                                 dst--;
 282                             }
 283                         }
 284                         else // the position of last slash was stored
 285                         {
 286                             // go directly there
 287                             dst = start + posLastSlash;
 288
 289                             // invalidate posLastSlash
 290                             posLastSlash = -1;
 291                         }
 292
 293                         // we must have found a slash one way or another!
 294                         wxASSERT_MSG( *dst == wxCONFIG_PATH_SEPARATOR,
 295                                       _T("error in wxRegConfig::SetPath") );
 296
 297                         // stay at the same position
 298                         dst--;
 299
 300                         // we killed one
 301                         totalSlashes--;
 302                     }
 303
 304                     // skip both dots
 305                     src += 2;
 306                 }
 307                 else // not "/.."
 308                 {
 309                     if ( (dst == start) || (dst[-1] != wxCONFIG_PATH_SEPARATOR) )
 310                     {
 311                         *dst = wxCONFIG_PATH_SEPARATOR;
 312
 313                         posLastSlash = dst - start;
 314
 315                         totalSlashes++;
 316                     }
 317                     else // previous char was a slash too
 318                     {
 319                         // squeeze several subsequent slashes into one: i.e.
 320                         // just ignore this one
 321                         dst--;
 322                     }
 323                 }
 324             }
 325             else // normal character
 326             {
 327                 // just copy
 328                 *dst = *src;
 329             }
 330         }
 331
 332         // NUL terminate the string
 333         if ( dst[-1] == wxCONFIG_PATH_SEPARATOR && (dst != start + 1) )
 334         {
 335             // if it has a trailing slash we remove it unless it is the only
 336             // string character
 337             dst--;
 338         }
 339
 340         *dst = _T('\0');
 341         buf.SetLength(dst - start);
 342     }
 343
 344 #ifdef WX_DEBUG_SET_PATH
 345     wxASSERT( m_strPath == m_strPathAlt );
 346 #endif
 347
 348     if ( m_strPath == strOldPath )
 349         return;
 350
 351     // registry APIs want backslashes instead of slashes
 352     wxString strRegPath;
 353     if ( !m_strPath.empty() )
 354     {
 355         size_t len = m_strPath.length();
 356
 357         const wxChar *src = m_strPath.c_str();
 358         wxStringBufferLength buf(strRegPath, len);
 359         wxChar *dst = buf;
 360
 361         const wxChar *end = src + len;
 362         for ( ; src < end; src++, dst++ )
 363         {
 364             if ( *src == wxCONFIG_PATH_SEPARATOR )
 365                 *dst = _T('\\');
 366             else
 367                 *dst = *src;
 368         }
 369
 370         buf.SetLength(len);
 371     }
 372
 373     // this is not needed any longer as we don't create keys unnecessarily any
 374     // more (now it is done on demand, i.e. only when they're going to contain
 375     // something)
 376 #if 0
 377     // as we create the registry key when SetPath(key) is done, we can be left
 378     // with plenty of empty keys if this was only done to try to read some
 379     // value which, in fact, doesn't exist - to prevent this from happening we
 380     // automatically delete the old key if it was empty
 381     if ( m_keyLocal.Exists() && LocalKey().IsEmpty() )
 382     {
 383         m_keyLocal.DeleteSelf();
 384     }
 385 #endif // 0
 386
 387     // change current key(s)
 388     m_keyLocal.SetName(m_keyLocalRoot, strRegPath);
 389
 390     if ( GetStyle() & wxCONFIG_USE_GLOBAL_FILE )
 391     {
 392       m_keyGlobal.SetName(m_keyGlobalRoot, strRegPath);
 393
 394       wxLogNull nolog;
 395       m_keyGlobal.Open(wxRegKey::Read);
 396     }
 397 }
 398
 399 // ----------------------------------------------------------------------------
 400 // enumeration (works only with current group)
 401 // ----------------------------------------------------------------------------
 402
 403 /*
 404   We want to enumerate all local keys/values after the global ones, but, of
 405   course, we don't want to repeat a key which appears locally as well as
 406   globally twice.
 407
 408   We use the 15th bit of lIndex for distinction between global and local.
 409  */
 410
 411 #define LOCAL_MASK        0x8000
 412 #define IS_LOCAL_INDEX(l) (((l) & LOCAL_MASK) != 0)
 413
 414 bool wxRegConfig::GetFirstGroup(wxString& str, long& lIndex) const
 415 {
 416   lIndex = 0;
 417   return GetNextGroup(str, lIndex);
 418 }
 419
 420 bool wxRegConfig::GetNextGroup(wxString& str, long& lIndex) const
 421 {
 422   // are we already enumerating local entries?
 423   if ( m_keyGlobal.IsOpened() && !IS_LOCAL_INDEX(lIndex) ) {
 424     // try to find a global entry which doesn't appear locally
 425     while ( m_keyGlobal.GetNextKey(str, lIndex) ) {
 426       if ( !m_keyLocal.Exists() || !LocalKey().HasSubKey(str) ) {
 427         // ok, found one - return it
 428         return TRUE;
 429       }
 430     }
 431
 432     // no more global entries
 433     lIndex |= LOCAL_MASK;
 434   }
 435
 436   // if we don't have the key at all, don't try to enumerate anything under it
 437   if ( !m_keyLocal.Exists() )
 438       return FALSE;
 439
 440   // much easier with local entries: get the next one we find
 441   // (don't forget to clear our flag bit and set it again later)
 442   lIndex &= ~LOCAL_MASK;
 443   bool bOk = LocalKey().GetNextKey(str, lIndex);
 444   lIndex |= LOCAL_MASK;
 445
 446   return bOk;
 447 }
 448
 449 bool wxRegConfig::GetFirstEntry(wxString& str, long& lIndex) const
 450 {
 451   lIndex = 0;
 452   return GetNextEntry(str, lIndex);
 453 }
 454
 455 bool wxRegConfig::GetNextEntry(wxString& str, long& lIndex) const
 456 {
 457   // are we already enumerating local entries?
 458   if ( m_keyGlobal.IsOpened() && !IS_LOCAL_INDEX(lIndex) ) {
 459     // try to find a global entry which doesn't appear locally
 460     while ( m_keyGlobal.GetNextValue(str, lIndex) ) {
 461       if ( !m_keyLocal.Exists() || !LocalKey().HasValue(str) ) {
 462         // ok, found one - return it
 463         return TRUE;
 464       }
 465     }
 466
 467     // no more global entries
 468     lIndex |= LOCAL_MASK;
 469   }
 470
 471   // if we don't have the key at all, don't try to enumerate anything under it
 472   if ( !m_keyLocal.Exists() )
 473       return FALSE;
 474
 475   // much easier with local entries: get the next one we find
 476   // (don't forget to clear our flag bit and set it again later)
 477   lIndex &= ~LOCAL_MASK;
 478   bool bOk = LocalKey().GetNextValue(str, lIndex);
 479   lIndex |= LOCAL_MASK;
 480
 481   return bOk;
 482 }
 483
 484 size_t wxRegConfig::GetNumberOfEntries(bool WXUNUSED(bRecursive)) const
 485 {
 486   size_t nEntries = 0;
 487
 488   // dummy vars
 489   wxString str;
 490   long l;
 491   bool bCont = ((wxRegConfig*)this)->GetFirstEntry(str, l);
 492   while ( bCont ) {
 493     nEntries++;
 494
 495     bCont = ((wxRegConfig*)this)->GetNextEntry(str, l);
 496   }
 497
 498   return nEntries;
 499 }
 500
 501 size_t wxRegConfig::GetNumberOfGroups(bool WXUNUSED(bRecursive)) const
 502 {
 503   size_t nGroups = 0;
 504
 505   // dummy vars
 506   wxString str;
 507   long l;
 508   bool bCont = ((wxRegConfig*)this)->GetFirstGroup(str, l);
 509   while ( bCont ) {
 510     nGroups++;
 511
 512     bCont = ((wxRegConfig*)this)->GetNextGroup(str, l);
 513   }
 514
 515   return nGroups;
 516 }
 517
 518 // ----------------------------------------------------------------------------
 519 // tests for existence
 520 // ----------------------------------------------------------------------------
 521
 522 bool wxRegConfig::HasGroup(const wxString& key) const
 523 {
 524     wxConfigPathChanger path(this, key);
 525
 526     wxString strName(path.Name());
 527
 528     return (m_keyLocal.Exists() && LocalKey().HasSubKey(strName)) ||
 529            m_keyGlobal.HasSubKey(strName);
 530 }
 531
 532 bool wxRegConfig::HasEntry(const wxString& key) const
 533 {
 534     wxConfigPathChanger path(this, key);
 535
 536     wxString strName(path.Name());
 537
 538     return (m_keyLocal.Exists() && LocalKey().HasValue(strName)) ||
 539            m_keyGlobal.HasValue(strName);
 540 }
 541
 542 wxConfigBase::EntryType wxRegConfig::GetEntryType(const wxString& key) const
 543 {
 544     wxConfigPathChanger path(this, key);
 545
 546     wxString strName(path.Name());
 547
 548     bool isNumeric;
 549     if ( m_keyLocal.Exists() && LocalKey().HasValue(strName) )
 550         isNumeric = m_keyLocal.IsNumericValue(strName);
 551     else if ( m_keyGlobal.HasValue(strName) )
 552         isNumeric = m_keyGlobal.IsNumericValue(strName);
 553     else
 554         return wxConfigBase::Type_Unknown;
 555
 556     return isNumeric ? wxConfigBase::Type_Integer : wxConfigBase::Type_String;
 557 }
 558
 559 // ----------------------------------------------------------------------------
 560 // reading/writing
 561 // ----------------------------------------------------------------------------
 562
 563 bool wxRegConfig::DoReadString(const wxString& key, wxString *pStr) const
 564 {
 565     wxCHECK_MSG( pStr, FALSE, _T("wxRegConfig::Read(): NULL param") );
 566
 567   wxConfigPathChanger path(this, key);
 568
 569   bool bQueryGlobal = TRUE;
 570
 571   // if immutable key exists in global key we must check that it's not
 572   // overriden by the local key with the same name
 573   if ( IsImmutable(path.Name()) ) {
 574     if ( TryGetValue(m_keyGlobal, path.Name(), *pStr) ) {
 575       if ( m_keyLocal.Exists() && LocalKey().HasValue(path.Name()) ) {
 576         wxLogWarning(wxT("User value for immutable key '%s' ignored."),
 577                    path.Name().c_str());
 578       }
 579
 580       return TRUE;
 581     }
 582     else {
 583       // don't waste time - it's not there anyhow
 584       bQueryGlobal = FALSE;
 585     }
 586   }
 587
 588   // first try local key
 589   if ( (m_keyLocal.Exists() && TryGetValue(LocalKey(), path.Name(), *pStr)) ||
 590        (bQueryGlobal && TryGetValue(m_keyGlobal, path.Name(), *pStr)) ) {
 591     return TRUE;
 592   }
 593
 594   return FALSE;
 595 }
 596
 597 // this exactly reproduces the string version above except for ExpandEnvVars(),
 598 // we really should avoid this code duplication somehow...
 599
 600 bool wxRegConfig::DoReadLong(const wxString& key, long *plResult) const
 601 {
 602     wxCHECK_MSG( plResult, FALSE, _T("wxRegConfig::Read(): NULL param") );
 603
 604   wxConfigPathChanger path(this, key);
 605
 606   bool bQueryGlobal = TRUE;
 607
 608   // if immutable key exists in global key we must check that it's not
 609   // overriden by the local key with the same name
 610   if ( IsImmutable(path.Name()) ) {
 611     if ( TryGetValue(m_keyGlobal, path.Name(), plResult) ) {
 612       if ( m_keyLocal.Exists() && LocalKey().HasValue(path.Name()) ) {
 613         wxLogWarning(wxT("User value for immutable key '%s' ignored."),
 614                      path.Name().c_str());
 615       }
 616
 617       return TRUE;
 618     }
 619     else {
 620       // don't waste time - it's not there anyhow
 621       bQueryGlobal = FALSE;
 622     }
 623   }
 624
 625   // first try local key
 626   if ( (m_keyLocal.Exists() && TryGetValue(LocalKey(), path.Name(), plResult)) ||
 627        (bQueryGlobal && TryGetValue(m_keyGlobal, path.Name(), plResult)) ) {
 628     return TRUE;
 629   }
 630
 631   return FALSE;
 632 }
 633
 634 bool wxRegConfig::DoWriteString(const wxString& key, const wxString& szValue)
 635 {
 636   wxConfigPathChanger path(this, key);
 637
 638   if ( IsImmutable(path.Name()) ) {
 639     wxLogError(wxT("Can't change immutable entry '%s'."), path.Name().c_str());
 640     return FALSE;
 641   }
 642
 643   return LocalKey().SetValue(path.Name(), szValue);
 644 }
 645
 646 bool wxRegConfig::DoWriteLong(const wxString& key, long lValue)
 647 {
 648   wxConfigPathChanger path(this, key);
 649
 650   if ( IsImmutable(path.Name()) ) {
 651     wxLogError(wxT("Can't change immutable entry '%s'."), path.Name().c_str());
 652     return FALSE;
 653   }
 654
 655   return LocalKey().SetValue(path.Name(), lValue);
 656 }
 657
 658 // ----------------------------------------------------------------------------
 659 // renaming
 660 // ----------------------------------------------------------------------------
 661
 662 bool wxRegConfig::RenameEntry(const wxString& oldName, const wxString& newName)
 663 {
 664     // check that the old entry exists...
 665     if ( !HasEntry(oldName) )
 666         return FALSE;
 667
 668     // and that the new one doesn't
 669     if ( HasEntry(newName) )
 670         return FALSE;
 671
 672     return m_keyLocal.RenameValue(oldName, newName);
 673 }
 674
 675 bool wxRegConfig::RenameGroup(const wxString& oldName, const wxString& newName)
 676 {
 677     // check that the old group exists...
 678     if ( !HasGroup(oldName) )
 679         return FALSE;
 680
 681     // and that the new one doesn't
 682     if ( HasGroup(newName) )
 683         return FALSE;
 684
 685     return wxRegKey(m_keyLocal, oldName).Rename(newName);
 686 }
 687
 688 // ----------------------------------------------------------------------------
 689 // deleting
 690 // ----------------------------------------------------------------------------
 691
 692 bool wxRegConfig::DeleteEntry(const wxString& value, bool bGroupIfEmptyAlso)
 693 {
 694   wxConfigPathChanger path(this, value);
 695
 696   if ( m_keyLocal.Exists() ) {
 697     if ( !m_keyLocal.DeleteValue(path.Name()) )
 698       return FALSE;
 699
 700     if ( bGroupIfEmptyAlso && m_keyLocal.IsEmpty() ) {
 701       wxString strKey = GetPath().AfterLast(wxCONFIG_PATH_SEPARATOR);
 702       SetPath(_T(".."));  // changes m_keyLocal
 703       return LocalKey().DeleteKey(strKey);
 704     }
 705   }
 706
 707   return TRUE;
 708 }
 709
 710 bool wxRegConfig::DeleteGroup(const wxString& key)
 711 {
 712   wxConfigPathChanger path(this, key);
 713
 714   return m_keyLocal.Exists() ? LocalKey().DeleteKey(path.Name()) : TRUE;
 715 }
 716
 717 bool wxRegConfig::DeleteAll()
 718 {
 719   m_keyLocal.Close();
 720   m_keyGlobal.Close();
 721
 722   bool bOk = m_keyLocalRoot.DeleteSelf();
 723
 724   // make sure that we opened m_keyGlobalRoot and so it has a reasonable name:
 725   // otherwise we will delete HKEY_CLASSES_ROOT recursively
 726   if ( bOk && m_keyGlobalRoot.IsOpened() )
 727     bOk = m_keyGlobalRoot.DeleteSelf();
 728
 729   return bOk;
 730 }
 731
 732 #endif
 733   // __WIN16__
 734
 735 #endif
 736   // wxUSE_CONFIG