src/msw/registry.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/registry.cpp
   3 // Purpose:     implementation of registry classes and functions
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     03.04.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 // TODO:        - parsing of registry key names
  11 //              - support of other (than REG_SZ/REG_DWORD) registry types
  12 //              - add high level functions (RegisterOleServer, ...)
  13 ///////////////////////////////////////////////////////////////////////////////
  14
  15 #ifdef __GNUG__
  16 #pragma implementation "registry.h"
  17 #endif
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include  "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23 #pragma hdrstop
  24 #endif
  25
  26 // other wxWindows headers
  27 #include  "wx/string.h"
  28 #include  "wx/intl.h"
  29 #include  "wx/log.h"
  30
  31 #ifndef __WIN16__
  32
  33 // Windows headers
  34 /*
  35 #define   STRICT
  36 #define   WIN32_LEAN_AND_MEAN
  37 */
  38
  39 #include  <windows.h>
  40
  41 // other std headers
  42 #include  <stdlib.h>      // for _MAX_PATH
  43
  44 #ifndef _MAX_PATH
  45     #define _MAX_PATH 512
  46 #endif
  47
  48 // our header
  49 #define   HKEY_DEFINED    // already defined in windows.h
  50 #include  "wx/msw/registry.h"
  51
  52 // some registry functions don't like signed chars
  53 typedef unsigned char *RegString;
  54
  55 // ----------------------------------------------------------------------------
  56 // constants
  57 // ----------------------------------------------------------------------------
  58
  59 // the standard key names, short names and handles all bundled together for
  60 // convenient access
  61 static struct
  62 {
  63   HKEY        hkey;
  64   const wxChar *szName;
  65   const wxChar *szShortName;
  66 }
  67 aStdKeys[] =
  68 {
  69   { HKEY_CLASSES_ROOT,      wxT("HKEY_CLASSES_ROOT"),      wxT("HKCR") },
  70 #ifdef  __WIN32__
  71   { HKEY_CURRENT_USER,      wxT("HKEY_CURRENT_USER"),      wxT("HKCU") },
  72   { HKEY_LOCAL_MACHINE,     wxT("HKEY_LOCAL_MACHINE"),     wxT("HKLM") },
  73   { HKEY_USERS,             wxT("HKEY_USERS"),             wxT("HKU")  }, // short name?
  74   { HKEY_PERFORMANCE_DATA,  wxT("HKEY_PERFORMANCE_DATA"),  wxT("HKPD") },
  75 #if     WINVER >= 0x0400
  76   { HKEY_CURRENT_CONFIG,    wxT("HKEY_CURRENT_CONFIG"),    wxT("HKCC") },
  77 #ifndef __GNUWIN32__
  78   { HKEY_DYN_DATA,          wxT("HKEY_DYN_DATA"),          wxT("HKDD") }, // short name?
  79 #endif  //GNUWIN32
  80 #endif  //WINVER >= 4.0
  81 #endif  //WIN32
  82 };
  83
  84 // the registry name separator (perhaps one day MS will change it to '/' ;-)
  85 #define   REG_SEPARATOR     wxT('\\')
  86
  87 // useful for Windows programmers: makes somewhat more clear all these zeroes
  88 // being passed to Windows APIs
  89 #define   RESERVED        (NULL)
  90
  91 // ----------------------------------------------------------------------------
  92 // macros
  93 // ----------------------------------------------------------------------------
  94
  95 // const_cast<> is not yet supported by all compilers
  96 #define CONST_CAST    ((wxRegKey *)this)->
  97
  98 // and neither is mutable which m_dwLastError should be
  99 #define m_dwLastError   CONST_CAST m_dwLastError
 100
 101 // ----------------------------------------------------------------------------
 102 // non member functions
 103 // ----------------------------------------------------------------------------
 104
 105 // removes the trailing backslash from the string if it has one
 106 static inline void RemoveTrailingSeparator(wxString& str);
 107
 108 // returns TRUE if given registry key exists
 109 static bool KeyExists(WXHKEY hRootKey, const wxChar *szKey);
 110
 111 // combines value and key name (uses static buffer!)
 112 static const wxChar *GetFullName(const wxRegKey *pKey,
 113                                const wxChar *szValue = NULL);
 114
 115 // ============================================================================
 116 // implementation of wxRegKey class
 117 // ============================================================================
 118
 119 // ----------------------------------------------------------------------------
 120 // static functions and variables
 121 // ----------------------------------------------------------------------------
 122
 123 const size_t wxRegKey::nStdKeys = WXSIZEOF(aStdKeys);
 124
 125 // @@ should take a `StdKey key', but as it's often going to be used in loops
 126 //    it would require casts in user code.
 127 const wxChar *wxRegKey::GetStdKeyName(size_t key)
 128 {
 129   // return empty string if key is invalid
 130   wxCHECK_MSG( key < nStdKeys, wxT(""), wxT("invalid key in wxRegKey::GetStdKeyName") );
 131
 132   return aStdKeys[key].szName;
 133 }
 134
 135 const wxChar *wxRegKey::GetStdKeyShortName(size_t key)
 136 {
 137   // return empty string if key is invalid
 138   wxCHECK( key < nStdKeys, wxT("") );
 139
 140   return aStdKeys[key].szShortName;
 141 }
 142
 143 wxRegKey::StdKey wxRegKey::ExtractKeyName(wxString& strKey)
 144 {
 145   wxString strRoot = strKey.BeforeFirst(REG_SEPARATOR);
 146
 147   HKEY hRootKey = 0;
 148   size_t ui;
 149   for ( ui = 0; ui < nStdKeys; ui++ ) {
 150     if ( strRoot.CmpNoCase(aStdKeys[ui].szName) == 0 ||
 151          strRoot.CmpNoCase(aStdKeys[ui].szShortName) == 0 ) {
 152       hRootKey = aStdKeys[ui].hkey;
 153       break;
 154     }
 155   }
 156
 157   if ( ui == nStdKeys ) {
 158     wxFAIL_MSG(wxT("invalid key prefix in wxRegKey::ExtractKeyName."));
 159
 160     hRootKey = HKEY_CLASSES_ROOT;
 161   }
 162   else {
 163     strKey = strKey.After(REG_SEPARATOR);
 164     if ( !strKey.IsEmpty() && strKey.Last() == REG_SEPARATOR )
 165       strKey.Truncate(strKey.Len() - 1);
 166   }
 167
 168   return (wxRegKey::StdKey)(int)hRootKey;
 169 }
 170
 171 wxRegKey::StdKey wxRegKey::GetStdKeyFromHkey(WXHKEY hkey)
 172 {
 173   for ( size_t ui = 0; ui < nStdKeys; ui++ ) {
 174     if ( (int) aStdKeys[ui].hkey == (int) hkey )
 175       return (StdKey)ui;
 176   }
 177
 178   wxFAIL_MSG(wxT("non root hkey passed to wxRegKey::GetStdKeyFromHkey."));
 179
 180   return HKCR;
 181 }
 182
 183 // ----------------------------------------------------------------------------
 184 // ctors and dtor
 185 // ----------------------------------------------------------------------------
 186
 187 wxRegKey::wxRegKey()
 188 {
 189   m_hRootKey = (WXHKEY) aStdKeys[HKCR].hkey;
 190
 191   Init();
 192 }
 193
 194 wxRegKey::wxRegKey(const wxString& strKey) : m_strKey(strKey)
 195 {
 196   m_hRootKey  = (WXHKEY) aStdKeys[ExtractKeyName(m_strKey)].hkey;
 197
 198   Init();
 199 }
 200
 201 // parent is a predefined (and preopened) key
 202 wxRegKey::wxRegKey(StdKey keyParent, const wxString& strKey) : m_strKey(strKey)
 203 {
 204   RemoveTrailingSeparator(m_strKey);
 205   m_hRootKey  = (WXHKEY) aStdKeys[keyParent].hkey;
 206
 207   Init();
 208 }
 209
 210 // parent is a normal regkey
 211 wxRegKey::wxRegKey(const wxRegKey& keyParent, const wxString& strKey)
 212         : m_strKey(keyParent.m_strKey)
 213 {
 214   // combine our name with parent's to get the full name
 215   if ( !m_strKey.IsEmpty() &&
 216        (strKey.IsEmpty() || strKey[0] != REG_SEPARATOR) ) {
 217       m_strKey += REG_SEPARATOR;
 218   }
 219
 220   m_strKey += strKey;
 221   RemoveTrailingSeparator(m_strKey);
 222
 223   m_hRootKey  = keyParent.m_hRootKey;
 224
 225   Init();
 226 }
 227
 228 // dtor closes the key releasing system resource
 229 wxRegKey::~wxRegKey()
 230 {
 231   Close();
 232 }
 233
 234 // ----------------------------------------------------------------------------
 235 // change the key name/hkey
 236 // ----------------------------------------------------------------------------
 237
 238 // set the full key name
 239 void wxRegKey::SetName(const wxString& strKey)
 240 {
 241   Close();
 242
 243   m_strKey = strKey;
 244   m_hRootKey = (WXHKEY) aStdKeys[ExtractKeyName(m_strKey)].hkey;
 245 }
 246
 247 // the name is relative to the parent key
 248 void wxRegKey::SetName(StdKey keyParent, const wxString& strKey)
 249 {
 250   Close();
 251
 252   m_strKey = strKey;
 253   RemoveTrailingSeparator(m_strKey);
 254   m_hRootKey = (WXHKEY) aStdKeys[keyParent].hkey;
 255 }
 256
 257 // the name is relative to the parent key
 258 void wxRegKey::SetName(const wxRegKey& keyParent, const wxString& strKey)
 259 {
 260   Close();
 261
 262   // combine our name with parent's to get the full name
 263
 264   // NB: this method is called by wxRegConfig::SetPath() which is a performance
 265   //     critical function and so it preallocates space for our m_strKey to
 266   //     gain some speed - this is why we only use += here and not = which
 267   //     would just free the prealloc'd buffer and would have to realloc it the
 268   //     next line!
 269   m_strKey.clear();
 270   m_strKey += keyParent.m_strKey;
 271   if ( !strKey.IsEmpty() && strKey[0] != REG_SEPARATOR )
 272     m_strKey += REG_SEPARATOR;
 273   m_strKey += strKey;
 274
 275   RemoveTrailingSeparator(m_strKey);
 276
 277   m_hRootKey = keyParent.m_hRootKey;
 278 }
 279
 280 // hKey should be opened and will be closed in wxRegKey dtor
 281 void wxRegKey::SetHkey(WXHKEY hKey)
 282 {
 283   Close();
 284
 285   m_hKey = hKey;
 286 }
 287
 288 // ----------------------------------------------------------------------------
 289 // info about the key
 290 // ----------------------------------------------------------------------------
 291
 292 // returns TRUE if the key exists
 293 bool wxRegKey::Exists() const
 294 {
 295   // opened key has to exist, try to open it if not done yet
 296   return IsOpened() ? TRUE : KeyExists(m_hRootKey, m_strKey);
 297 }
 298
 299 // returns the full name of the key (prefix is abbreviated if bShortPrefix)
 300 wxString wxRegKey::GetName(bool bShortPrefix) const
 301 {
 302   StdKey key = GetStdKeyFromHkey((StdKey) m_hRootKey);
 303   wxString str = bShortPrefix ? aStdKeys[key].szShortName
 304                               : aStdKeys[key].szName;
 305   if ( !m_strKey.IsEmpty() )
 306     str << _T("\\") << m_strKey;
 307
 308   return str;
 309 }
 310
 311 bool wxRegKey::GetKeyInfo(size_t *pnSubKeys,
 312                           size_t *pnMaxKeyLen,
 313                           size_t *pnValues,
 314                           size_t *pnMaxValueLen) const
 315 {
 316 #if defined(__WIN32__) && !defined(__TWIN32__)
 317
 318     // old gcc headers incorrectly prototype RegQueryInfoKey()
 319 #if defined(__GNUWIN32_OLD__) && !defined(__CYGWIN10__)
 320     #define REG_PARAM   (size_t *)
 321 #else
 322     #define REG_PARAM   (LPDWORD)
 323 #endif
 324
 325   // it might be unexpected to some that this function doesn't open the key
 326   wxASSERT_MSG( IsOpened(), _T("key should be opened in GetKeyInfo") );
 327
 328   m_dwLastError = ::RegQueryInfoKey
 329                   (
 330                     (HKEY) m_hKey,
 331                     NULL,           // class name
 332                     NULL,           // (ptr to) size of class name buffer
 333                     RESERVED,
 334                     REG_PARAM
 335                     pnSubKeys,      // [out] number of subkeys
 336                     REG_PARAM
 337                     pnMaxKeyLen,    // [out] max length of a subkey name
 338                     NULL,           // longest subkey class name
 339                     REG_PARAM
 340                     pnValues,       // [out] number of values
 341                     REG_PARAM
 342                     pnMaxValueLen,  // [out] max length of a value name
 343                     NULL,           // longest value data
 344                     NULL,           // security descriptor
 345                     NULL            // time of last modification
 346                   );
 347
 348 #undef REG_PARAM
 349
 350   if ( m_dwLastError != ERROR_SUCCESS ) {
 351     wxLogSysError(m_dwLastError, _("Can't get info about registry key '%s'"),
 352                   GetName().c_str());
 353     return FALSE;
 354   }
 355
 356   return TRUE;
 357 #else // Win16
 358   wxFAIL_MSG("GetKeyInfo() not implemented");
 359
 360   return FALSE;
 361 #endif
 362 }
 363
 364 // ----------------------------------------------------------------------------
 365 // operations
 366 // ----------------------------------------------------------------------------
 367
 368 // opens key (it's not an error to call Open() on an already opened key)
 369 bool wxRegKey::Open()
 370 {
 371   if ( IsOpened() )
 372     return TRUE;
 373
 374   HKEY tmpKey;
 375   m_dwLastError = RegOpenKey((HKEY) m_hRootKey, m_strKey, &tmpKey);
 376   if ( m_dwLastError != ERROR_SUCCESS ) {
 377     wxLogSysError(m_dwLastError, _("Can't open registry key '%s'"),
 378                   GetName().c_str());
 379     return FALSE;
 380   }
 381   else
 382   {
 383     m_hKey = (WXHKEY) tmpKey;
 384     return TRUE;
 385   }
 386 }
 387
 388 // creates key, failing if it exists and !bOkIfExists
 389 bool wxRegKey::Create(bool bOkIfExists)
 390 {
 391   // check for existence only if asked (i.e. order is important!)
 392   if ( !bOkIfExists && Exists() ) {
 393     return FALSE;
 394   }
 395
 396   if ( IsOpened() )
 397     return TRUE;
 398
 399   HKEY tmpKey;
 400   m_dwLastError = RegCreateKey((HKEY) m_hRootKey, m_strKey, &tmpKey);
 401   if ( m_dwLastError != ERROR_SUCCESS ) {
 402     wxLogSysError(m_dwLastError, _("Can't create registry key '%s'"),
 403                   GetName().c_str());
 404     return FALSE;
 405   }
 406   else
 407   {
 408     m_hKey = (WXHKEY) tmpKey;
 409     return TRUE;
 410   }
 411 }
 412
 413 // close the key, it's not an error to call it when not opened
 414 bool wxRegKey::Close()
 415 {
 416   if ( IsOpened() ) {
 417     m_dwLastError = RegCloseKey((HKEY) m_hKey);
 418     m_hKey = 0;
 419
 420     if ( m_dwLastError != ERROR_SUCCESS ) {
 421       wxLogSysError(m_dwLastError, _("Can't close registry key '%s'"),
 422                     GetName().c_str());
 423
 424       return FALSE;
 425     }
 426   }
 427
 428   return TRUE;
 429 }
 430
 431 bool wxRegKey::RenameValue(const wxChar *szValueOld, const wxChar *szValueNew)
 432 {
 433     bool ok = TRUE;
 434     if ( HasValue(szValueNew) ) {
 435         wxLogError(_("Registry value '%s' already exists."), szValueNew);
 436
 437         ok = FALSE;
 438     }
 439
 440     if ( !ok ||
 441          !CopyValue(szValueOld, *this, szValueNew) ||
 442          !DeleteValue(szValueOld) ) {
 443         wxLogError(_("Failed to rename registry value '%s' to '%s'."),
 444                    szValueOld, szValueNew);
 445
 446         return FALSE;
 447     }
 448
 449     return TRUE;
 450 }
 451
 452 bool wxRegKey::CopyValue(const wxChar *szValue,
 453                          wxRegKey& keyDst,
 454                          const wxChar *szValueNew)
 455 {
 456     if ( !szValueNew ) {
 457         // by default, use the same name
 458         szValueNew = szValue;
 459     }
 460
 461     switch ( GetValueType(szValue) ) {
 462         case Type_String:
 463             {
 464                 wxString strVal;
 465                 return QueryValue(szValue, strVal) &&
 466                        keyDst.SetValue(szValueNew, strVal);
 467             }
 468
 469         case Type_Dword:
 470         /* case Type_Dword_little_endian: == Type_Dword */
 471             {
 472                 long dwVal;
 473                 return QueryValue(szValue, &dwVal) &&
 474                        keyDst.SetValue(szValueNew, dwVal);
 475             }
 476
 477         // these types are unsupported because I am not sure about how
 478         // exactly they should be copied and because they shouldn't
 479         // occur among the application keys (supposedly created with
 480         // this class)
 481 #ifdef  __WIN32__
 482         case Type_None:
 483         case Type_Expand_String:
 484         case Type_Binary:
 485         case Type_Dword_big_endian:
 486         case Type_Link:
 487         case Type_Multi_String:
 488         case Type_Resource_list:
 489         case Type_Full_resource_descriptor:
 490         case Type_Resource_requirements_list:
 491 #endif // Win32
 492         default:
 493             wxLogError(_("Can't copy values of unsupported type %d."),
 494                        GetValueType(szValue));
 495             return FALSE;
 496     }
 497 }
 498
 499 bool wxRegKey::Rename(const wxChar *szNewName)
 500 {
 501     wxCHECK_MSG( !!m_strKey, FALSE, _T("registry hives can't be renamed") );
 502
 503     if ( !Exists() ) {
 504         wxLogError(_("Registry key '%s' does not exist, cannot rename it."),
 505                    GetFullName(this));
 506
 507         return FALSE;
 508     }
 509
 510     // do we stay in the same hive?
 511     bool inSameHive = !wxStrchr(szNewName, REG_SEPARATOR);
 512
 513     // construct the full new name of the key
 514     wxRegKey keyDst;
 515
 516     if ( inSameHive ) {
 517         // rename the key to the new name under the same parent
 518         wxString strKey = m_strKey.BeforeLast(REG_SEPARATOR);
 519         if ( !!strKey ) {
 520             // don't add '\\' in the start if strFullNewName is empty
 521             strKey += REG_SEPARATOR;
 522         }
 523
 524         strKey += szNewName;
 525
 526         keyDst.SetName(GetStdKeyFromHkey(m_hRootKey), strKey);
 527     }
 528     else {
 529         // this is the full name already
 530         keyDst.SetName(szNewName);
 531     }
 532
 533     bool ok = keyDst.Create(FALSE /* fail if alredy exists */);
 534     if ( !ok ) {
 535         wxLogError(_("Registry key '%s' already exists."),
 536                    GetFullName(&keyDst));
 537     }
 538     else {
 539         ok = Copy(keyDst) && DeleteSelf();
 540     }
 541
 542     if ( !ok ) {
 543         wxLogError(_("Failed to rename the registry key '%s' to '%s'."),
 544                    GetFullName(this), GetFullName(&keyDst));
 545     }
 546     else {
 547         m_hRootKey = keyDst.m_hRootKey;
 548         m_strKey = keyDst.m_strKey;
 549     }
 550
 551     return ok;
 552 }
 553
 554 bool wxRegKey::Copy(const wxChar *szNewName)
 555 {
 556     // create the new key first
 557     wxRegKey keyDst(szNewName);
 558     bool ok = keyDst.Create(FALSE /* fail if alredy exists */);
 559     if ( ok ) {
 560         ok = Copy(keyDst);
 561
 562         // we created the dest key but copying to it failed - delete it
 563         if ( !ok ) {
 564             (void)keyDst.DeleteSelf();
 565         }
 566     }
 567
 568     return ok;
 569 }
 570
 571 bool wxRegKey::Copy(wxRegKey& keyDst)
 572 {
 573     bool ok = TRUE;
 574
 575     // copy all sub keys to the new location
 576     wxString strKey;
 577     long lIndex;
 578     bool bCont = GetFirstKey(strKey, lIndex);
 579     while ( ok && bCont ) {
 580         wxRegKey key(*this, strKey);
 581         wxString keyName;
 582         keyName << GetFullName(&keyDst) << REG_SEPARATOR << strKey;
 583         ok = key.Copy((const wxChar*) keyName);
 584
 585         if ( ok )
 586             bCont = GetNextKey(strKey, lIndex);
 587     }
 588
 589     // copy all values
 590     wxString strVal;
 591     bCont = GetFirstValue(strVal, lIndex);
 592     while ( ok && bCont ) {
 593         ok = CopyValue(strVal, keyDst);
 594
 595         if ( !ok ) {
 596             wxLogSysError(m_dwLastError,
 597                           _("Failed to copy registry value '%s'"),
 598                           strVal.c_str());
 599         }
 600         else {
 601             bCont = GetNextValue(strVal, lIndex);
 602         }
 603     }
 604
 605     if ( !ok ) {
 606         wxLogError(_("Failed to copy the contents of registry key '%s' to '%s'."), GetFullName(this), GetFullName(&keyDst));
 607     }
 608
 609     return ok;
 610 }
 611
 612 // ----------------------------------------------------------------------------
 613 // delete keys/values
 614 // ----------------------------------------------------------------------------
 615 bool wxRegKey::DeleteSelf()
 616 {
 617   {
 618     wxLogNull nolog;
 619     if ( !Open() ) {
 620       // it already doesn't exist - ok!
 621       return TRUE;
 622     }
 623   }
 624
 625   // prevent a buggy program from erasing one of the root registry keys or an
 626   // immediate subkey (i.e. one which doesn't have '\\' inside) of any other
 627   // key except HKCR (HKCR has some "deleteable" subkeys)
 628   if ( m_strKey.IsEmpty() ||
 629        ((m_hRootKey != (WXHKEY) aStdKeys[HKCR].hkey) &&
 630         (m_strKey.Find(REG_SEPARATOR) == wxNOT_FOUND)) ) {
 631       wxLogError(_("Registry key '%s' is needed for normal system operation,\ndeleting it will leave your system in unusable state:\noperation aborted."), GetFullName(this));
 632
 633       return FALSE;
 634   }
 635
 636   // we can't delete keys while enumerating because it confuses GetNextKey, so
 637   // we first save the key names and then delete them all
 638   wxArrayString astrSubkeys;
 639
 640   wxString strKey;
 641   long lIndex;
 642   bool bCont = GetFirstKey(strKey, lIndex);
 643   while ( bCont ) {
 644     astrSubkeys.Add(strKey);
 645
 646     bCont = GetNextKey(strKey, lIndex);
 647   }
 648
 649   size_t nKeyCount = astrSubkeys.Count();
 650   for ( size_t nKey = 0; nKey < nKeyCount; nKey++ ) {
 651     wxRegKey key(*this, astrSubkeys[nKey]);
 652     if ( !key.DeleteSelf() )
 653       return FALSE;
 654   }
 655
 656   // now delete this key itself
 657   Close();
 658
 659   m_dwLastError = RegDeleteKey((HKEY) m_hRootKey, m_strKey);
 660   if ( m_dwLastError != ERROR_SUCCESS ) {
 661     wxLogSysError(m_dwLastError, _("Can't delete key '%s'"),
 662                   GetName().c_str());
 663     return FALSE;
 664   }
 665
 666   return TRUE;
 667 }
 668
 669 bool wxRegKey::DeleteKey(const wxChar *szKey)
 670 {
 671   if ( !Open() )
 672     return FALSE;
 673
 674   wxRegKey key(*this, szKey);
 675   return key.DeleteSelf();
 676 }
 677
 678 bool wxRegKey::DeleteValue(const wxChar *szValue)
 679 {
 680   if ( !Open() )
 681     return FALSE;
 682
 683 #if defined(__WIN32__) && !defined(__TWIN32__)
 684     m_dwLastError = RegDeleteValue((HKEY) m_hKey, WXSTRINGCAST szValue);
 685     if ( m_dwLastError != ERROR_SUCCESS ) {
 686       wxLogSysError(m_dwLastError, _("Can't delete value '%s' from key '%s'"),
 687                     szValue, GetName().c_str());
 688       return FALSE;
 689     }
 690   #else   //WIN16
 691     // named registry values don't exist in Win16 world
 692     wxASSERT( IsEmpty(szValue) );
 693
 694     // just set the (default and unique) value of the key to ""
 695     m_dwLastError = RegSetValue((HKEY) m_hKey, NULL, REG_SZ, "", RESERVED);
 696     if ( m_dwLastError != ERROR_SUCCESS ) {
 697       wxLogSysError(m_dwLastError, _("Can't delete value of key '%s'"),
 698                     GetName().c_str());
 699       return FALSE;
 700     }
 701   #endif  //WIN16/32
 702
 703   return TRUE;
 704 }
 705
 706 // ----------------------------------------------------------------------------
 707 // access to values and subkeys
 708 // ----------------------------------------------------------------------------
 709
 710 // return TRUE if value exists
 711 bool wxRegKey::HasValue(const wxChar *szValue) const
 712 {
 713   // this function should be silent, so suppress possible messages from Open()
 714   wxLogNull nolog;
 715
 716   #ifdef  __WIN32__
 717     if ( !CONST_CAST Open() )
 718         return FALSE;
 719
 720     LONG dwRet = ::RegQueryValueEx((HKEY) m_hKey,
 721                                    WXSTRINGCAST szValue,
 722                                    RESERVED,
 723                                    NULL, NULL, NULL);
 724     return dwRet == ERROR_SUCCESS;
 725   #else   // WIN16
 726     // only unnamed value exists
 727     return IsEmpty(szValue);
 728   #endif  // WIN16/32
 729 }
 730
 731 // returns TRUE if this key has any values
 732 bool wxRegKey::HasValues() const
 733 {
 734   // suppress possible messages from GetFirstValue()
 735   wxLogNull nolog;
 736
 737   // just call GetFirstValue with dummy parameters
 738   wxString str;
 739   long     l;
 740   return CONST_CAST GetFirstValue(str, l);
 741 }
 742
 743 // returns TRUE if this key has any subkeys
 744 bool wxRegKey::HasSubkeys() const
 745 {
 746   // suppress possible messages from GetFirstKey()
 747   wxLogNull nolog;
 748
 749   // just call GetFirstKey with dummy parameters
 750   wxString str;
 751   long     l;
 752   return CONST_CAST GetFirstKey(str, l);
 753 }
 754
 755 // returns TRUE if given subkey exists
 756 bool wxRegKey::HasSubKey(const wxChar *szKey) const
 757 {
 758   // this function should be silent, so suppress possible messages from Open()
 759   wxLogNull nolog;
 760
 761   if ( !CONST_CAST Open() )
 762     return FALSE;
 763
 764   return KeyExists(m_hKey, szKey);
 765 }
 766
 767 wxRegKey::ValueType wxRegKey::GetValueType(const wxChar *szValue) const
 768 {
 769   #ifdef  __WIN32__
 770     if ( ! CONST_CAST Open() )
 771       return Type_None;
 772
 773     DWORD dwType;
 774     m_dwLastError = RegQueryValueEx((HKEY) m_hKey, WXSTRINGCAST szValue, RESERVED,
 775                                     &dwType, NULL, NULL);
 776     if ( m_dwLastError != ERROR_SUCCESS ) {
 777       wxLogSysError(m_dwLastError, _("Can't read value of key '%s'"),
 778                     GetName().c_str());
 779       return Type_None;
 780     }
 781
 782     return (ValueType)dwType;
 783   #else   //WIN16
 784     return IsEmpty(szValue) ? Type_String : Type_None;
 785   #endif  //WIN16/32
 786 }
 787
 788 #ifdef  __WIN32__
 789 bool wxRegKey::SetValue(const wxChar *szValue, long lValue)
 790 {
 791 #ifdef __TWIN32__
 792   wxFAIL_MSG("RegSetValueEx not implemented by TWIN32");
 793   return FALSE;
 794 #else
 795   if ( CONST_CAST Open() ) {
 796     m_dwLastError = RegSetValueEx((HKEY) m_hKey, szValue, (DWORD) RESERVED, REG_DWORD,
 797                                   (RegString)&lValue, sizeof(lValue));
 798     if ( m_dwLastError == ERROR_SUCCESS )
 799       return TRUE;
 800   }
 801
 802   wxLogSysError(m_dwLastError, _("Can't set value of '%s'"),
 803                 GetFullName(this, szValue));
 804   return FALSE;
 805 #endif
 806 }
 807
 808 bool wxRegKey::QueryValue(const wxChar *szValue, long *plValue) const
 809 {
 810   if ( CONST_CAST Open() ) {
 811     DWORD dwType, dwSize = sizeof(DWORD);
 812     RegString pBuf = (RegString)plValue;
 813     m_dwLastError = RegQueryValueEx((HKEY) m_hKey, WXSTRINGCAST szValue, RESERVED,
 814                                     &dwType, pBuf, &dwSize);
 815     if ( m_dwLastError != ERROR_SUCCESS ) {
 816       wxLogSysError(m_dwLastError, _("Can't read value of key '%s'"),
 817                     GetName().c_str());
 818       return FALSE;
 819     }
 820     else {
 821       // check that we read the value of right type
 822       wxASSERT_MSG( IsNumericValue(szValue),
 823                     wxT("Type mismatch in wxRegKey::QueryValue().")  );
 824
 825       return TRUE;
 826     }
 827   }
 828   else
 829     return FALSE;
 830 }
 831
 832 #endif  //Win32
 833
 834 bool wxRegKey::QueryValue(const wxChar *szValue,
 835                           wxString& strValue,
 836                           bool raw) const
 837 {
 838   if ( CONST_CAST Open() ) {
 839     #ifdef  __WIN32__
 840       // first get the type and size of the data
 841       DWORD dwType, dwSize;
 842       m_dwLastError = RegQueryValueEx((HKEY) m_hKey, WXSTRINGCAST szValue, RESERVED,
 843                                       &dwType, NULL, &dwSize);
 844       if ( m_dwLastError == ERROR_SUCCESS ) {
 845         if ( !dwSize ) {
 846             // must treat this case specially as GetWriteBuf() doesn't like
 847             // being called with 0 size
 848             strValue.Empty();
 849         }
 850         else {
 851             RegString pBuf = (RegString)strValue.GetWriteBuf(dwSize);
 852             m_dwLastError = RegQueryValueEx((HKEY) m_hKey,
 853                                             WXSTRINGCAST szValue,
 854                                             RESERVED,
 855                                             &dwType,
 856                                             pBuf,
 857                                             &dwSize);
 858             strValue.UngetWriteBuf();
 859
 860             // expand the var expansions in the string unless disabled
 861             if ( (dwType == REG_EXPAND_SZ) && !raw )
 862             {
 863                 DWORD dwExpSize = ::ExpandEnvironmentStrings(strValue, NULL, 0);
 864                 bool ok = dwExpSize != 0;
 865                 if ( ok )
 866                 {
 867                     wxString strExpValue;
 868                     ok = ::ExpandEnvironmentStrings
 869                            (
 870                             strValue,
 871                             strExpValue.GetWriteBuf(dwExpSize),
 872                             dwExpSize
 873                            ) != 0;
 874                     strExpValue.UngetWriteBuf();
 875                     strValue = strExpValue;
 876                 }
 877
 878                 if ( !ok )
 879                 {
 880                     wxLogLastError(_T("ExpandEnvironmentStrings"));
 881                 }
 882             }
 883         }
 884
 885         if ( m_dwLastError == ERROR_SUCCESS ) {
 886           // check that it was the right type
 887           wxASSERT_MSG( !IsNumericValue(szValue),
 888                         wxT("Type mismatch in wxRegKey::QueryValue().") );
 889
 890           return TRUE;
 891         }
 892       }
 893     #else   //WIN16
 894       // named registry values don't exist in Win16
 895       wxASSERT( IsEmpty(szValue) );
 896
 897       m_dwLastError = RegQueryValue((HKEY) m_hKey, 0, strValue.GetWriteBuf(256), &l);
 898       strValue.UngetWriteBuf();
 899       if ( m_dwLastError == ERROR_SUCCESS )
 900         return TRUE;
 901     #endif  //WIN16/32
 902   }
 903
 904   wxLogSysError(m_dwLastError, _("Can't read value of '%s'"),
 905                 GetFullName(this, szValue));
 906   return FALSE;
 907 }
 908
 909 bool wxRegKey::SetValue(const wxChar *szValue, const wxString& strValue)
 910 {
 911   if ( CONST_CAST Open() ) {
 912 #if defined( __WIN32__) && !defined(__TWIN32__)
 913       m_dwLastError = RegSetValueEx((HKEY) m_hKey, szValue, (DWORD) RESERVED, REG_SZ,
 914                                     (RegString)strValue.c_str(),
 915                                     (strValue.Len() + 1)*sizeof(wxChar));
 916       if ( m_dwLastError == ERROR_SUCCESS )
 917         return TRUE;
 918     #else   //WIN16
 919       // named registry values don't exist in Win16
 920       wxASSERT( IsEmpty(szValue) );
 921
 922       m_dwLastError = RegSetValue((HKEY) m_hKey, NULL, REG_SZ, strValue, NULL);
 923       if ( m_dwLastError == ERROR_SUCCESS )
 924         return TRUE;
 925     #endif  //WIN16/32
 926   }
 927
 928   wxLogSysError(m_dwLastError, _("Can't set value of '%s'"),
 929                 GetFullName(this, szValue));
 930   return FALSE;
 931 }
 932
 933 wxString wxRegKey::QueryDefaultValue() const
 934 {
 935   wxString str;
 936   QueryValue(NULL, str);
 937   return str;
 938 }
 939
 940 // ----------------------------------------------------------------------------
 941 // enumeration
 942 // NB: all these functions require an index variable which allows to have
 943 //     several concurrently running indexations on the same key
 944 // ----------------------------------------------------------------------------
 945
 946 bool wxRegKey::GetFirstValue(wxString& strValueName, long& lIndex)
 947 {
 948   if ( !Open() )
 949     return FALSE;
 950
 951   lIndex = 0;
 952   return GetNextValue(strValueName, lIndex);
 953 }
 954
 955 bool wxRegKey::GetNextValue(wxString& strValueName, long& lIndex) const
 956 {
 957   wxASSERT( IsOpened() );
 958
 959   // are we already at the end of enumeration?
 960   if ( lIndex == -1 )
 961     return FALSE;
 962
 963 #if defined( __WIN32__) && !defined(__TWIN32__)
 964     wxChar  szValueName[1024];                  // @@ use RegQueryInfoKey...
 965     DWORD dwValueLen = WXSIZEOF(szValueName);
 966
 967     m_dwLastError = RegEnumValue((HKEY) m_hKey, lIndex++,
 968                                  szValueName, &dwValueLen,
 969                                  RESERVED,
 970                                  NULL,            // [out] type
 971                                  NULL,            // [out] buffer for value
 972                                  NULL);           // [i/o]  it's length
 973
 974     if ( m_dwLastError != ERROR_SUCCESS ) {
 975       if ( m_dwLastError == ERROR_NO_MORE_ITEMS ) {
 976         m_dwLastError = ERROR_SUCCESS;
 977         lIndex = -1;
 978       }
 979       else {
 980         wxLogSysError(m_dwLastError, _("Can't enumerate values of key '%s'"),
 981                       GetName().c_str());
 982       }
 983
 984       return FALSE;
 985     }
 986
 987     strValueName = szValueName;
 988   #else   //WIN16
 989     // only one unnamed value
 990     wxASSERT( lIndex == 0 );
 991
 992     lIndex = -1;
 993     strValueName.Empty();
 994   #endif
 995
 996   return TRUE;
 997 }
 998
 999 bool wxRegKey::GetFirstKey(wxString& strKeyName, long& lIndex)
1000 {
1001   if ( !Open() )
1002     return FALSE;
1003
1004   lIndex = 0;
1005   return GetNextKey(strKeyName, lIndex);
1006 }
1007
1008 bool wxRegKey::GetNextKey(wxString& strKeyName, long& lIndex) const
1009 {
1010   wxASSERT( IsOpened() );
1011
1012   // are we already at the end of enumeration?
1013   if ( lIndex == -1 )
1014     return FALSE;
1015
1016   wxChar szKeyName[_MAX_PATH + 1];
1017   m_dwLastError = RegEnumKey((HKEY) m_hKey, lIndex++, szKeyName, WXSIZEOF(szKeyName));
1018
1019   if ( m_dwLastError != ERROR_SUCCESS ) {
1020     if ( m_dwLastError == ERROR_NO_MORE_ITEMS ) {
1021       m_dwLastError = ERROR_SUCCESS;
1022       lIndex = -1;
1023     }
1024     else {
1025       wxLogSysError(m_dwLastError, _("Can't enumerate subkeys of key '%s'"),
1026                     GetName().c_str());
1027     }
1028
1029     return FALSE;
1030   }
1031
1032   strKeyName = szKeyName;
1033   return TRUE;
1034 }
1035
1036 // returns TRUE if the value contains a number (else it's some string)
1037 bool wxRegKey::IsNumericValue(const wxChar *szValue) const
1038   {
1039       ValueType type = GetValueType(szValue);
1040       switch ( type ) {
1041         case Type_Dword:
1042         /* case Type_Dword_little_endian: == Type_Dword */
1043         case Type_Dword_big_endian:
1044             return TRUE;
1045
1046         default:
1047             return FALSE;
1048       }
1049   }
1050
1051 // ============================================================================
1052 // implementation of global private functions
1053 // ============================================================================
1054
1055 bool KeyExists(WXHKEY hRootKey, const wxChar *szKey)
1056 {
1057   // don't close this key itself for the case of empty szKey!
1058   if ( wxIsEmpty(szKey) )
1059     return TRUE;
1060
1061   HKEY hkeyDummy;
1062   if ( RegOpenKey( (HKEY) hRootKey, szKey, &hkeyDummy) == ERROR_SUCCESS ) {
1063     RegCloseKey(hkeyDummy);
1064     return TRUE;
1065   }
1066   else
1067     return FALSE;
1068 }
1069
1070 const wxChar *GetFullName(const wxRegKey *pKey, const wxChar *szValue)
1071 {
1072   static wxString s_str;
1073   s_str = pKey->GetName();
1074   if ( !wxIsEmpty(szValue) )
1075     s_str << wxT("\\") << szValue;
1076
1077   return s_str.c_str();
1078 }
1079
1080 void RemoveTrailingSeparator(wxString& str)
1081 {
1082   if ( !str.IsEmpty() && str.Last() == REG_SEPARATOR )
1083     str.Truncate(str.Len() - 1);
1084 }
1085
1086 #endif
1087   // __WIN16__
1088