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 // ============================================================================
  16 // declarations
  17 // ============================================================================
  18
  19 // ----------------------------------------------------------------------------
  20 // headers
  21 // ----------------------------------------------------------------------------
  22
  23 // for compilers that support precompilation, includes "wx.h".
  24 #include  "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27 #pragma hdrstop
  28 #endif
  29
  30 // other wxWindows headers
  31 #include  "wx/string.h"
  32 #include  "wx/intl.h"
  33 #include  "wx/log.h"
  34
  35 // Windows headers
  36 /*
  37 #define   STRICT
  38 #define   WIN32_LEAN_AND_MEAN
  39 */
  40
  41 #include  <windows.h>
  42
  43 // other std headers
  44 #include  <stdlib.h>      // for _MAX_PATH
  45
  46 #ifndef _MAX_PATH
  47         #define _MAX_PATH 512
  48 #endif
  49
  50 // our header
  51 #define   HKEY_DEFINED    // already defined in windows.h
  52 #include  "wx/msw/registry.h"
  53
  54 // some registry functions don't like signed chars
  55 typedef unsigned char *RegString;
  56
  57 // ----------------------------------------------------------------------------
  58 // constants
  59 // ----------------------------------------------------------------------------
  60
  61 // the standard key names, short names and handles all bundled together for
  62 // convenient access
  63 static struct
  64 {
  65   HKEY        hkey;
  66   const char *szName;
  67   const char *szShortName;
  68 }
  69 aStdKeys[] =
  70 {
  71   { HKEY_CLASSES_ROOT,      "HKEY_CLASSES_ROOT",      "HKCR" },
  72 #ifdef  __WIN32__
  73   { HKEY_CURRENT_USER,      "HKEY_CURRENT_USER",      "HKCU" },
  74   { HKEY_LOCAL_MACHINE,     "HKEY_LOCAL_MACHINE",     "HKLM" },
  75   { HKEY_USERS,             "HKEY_USERS",             "HKU"  }, // short name?
  76   { HKEY_PERFORMANCE_DATA,  "HKEY_PERFORMANCE_DATA",  "HKPD" },
  77 #if     WINVER >= 0x0400
  78   { HKEY_CURRENT_CONFIG,    "HKEY_CURRENT_CONFIG",    "HKCC" },
  79 #ifndef __GNUWIN32__
  80   { HKEY_DYN_DATA,          "HKEY_DYN_DATA",          "HKDD" }, // short name?
  81 #endif  //GNUWIN32
  82 #endif  //WINVER >= 4.0
  83 #endif  //WIN32
  84 };
  85
  86 // the registry name separator (perhaps one day MS will change it to '/' ;-)
  87 #define   REG_SEPARATOR     '\\'
  88
  89 // ----------------------------------------------------------------------------
  90 // macros
  91 // ----------------------------------------------------------------------------
  92 // @ const_cast<> is not yet supported by all compilers
  93 #define CONST_CAST    ((wxRegKey *)this)->
  94
  95 #if   !USE_MUTABLE
  96   #define m_dwLastError   CONST_CAST m_dwLastError
  97 #endif
  98
  99 // ----------------------------------------------------------------------------
 100 // non member functions
 101 // ----------------------------------------------------------------------------
 102
 103 // removes the trailing backslash from the string if it has one
 104 static inline void RemoveTrailingSeparator(wxString& str);
 105
 106 // returns TRUE if given registry key exists
 107 static bool KeyExists(HKEY hRootKey, const char *szKey);
 108
 109 // combines value and key name (uses static buffer!)
 110 static const char *GetFullName(const wxRegKey *pKey,
 111                                const char *szValue = NULL);
 112
 113 // ============================================================================
 114 // implementation of wxRegKey class
 115 // ============================================================================
 116
 117 // ----------------------------------------------------------------------------
 118 // static functions and variables
 119 // ----------------------------------------------------------------------------
 120
 121 const size_t wxRegKey::nStdKeys = WXSIZEOF(aStdKeys);
 122
 123 // @@ should take a `StdKey key', but as it's often going to be used in loops
 124 //    it would require casts in user code.
 125 const char *wxRegKey::GetStdKeyName(uint key)
 126 {
 127   // return empty string if key is invalid
 128   wxCHECK_MSG( key < nStdKeys, "", "invalid key in wxRegKey::GetStdKeyName" );
 129
 130   return aStdKeys[key].szName;
 131 }
 132
 133 const char *wxRegKey::GetStdKeyShortName(uint key)
 134 {
 135   // return empty string if key is invalid
 136   wxCHECK( key < nStdKeys, "" );
 137
 138   return aStdKeys[key].szShortName;
 139 }
 140
 141 wxRegKey::StdKey wxRegKey::ExtractKeyName(wxString& strKey)
 142 {
 143   wxString strRoot = strKey.Left(REG_SEPARATOR);
 144
 145   HKEY hRootKey;
 146   uint ui;
 147   for ( ui = 0; ui < nStdKeys; ui++ ) {
 148     if ( strRoot.CmpNoCase(aStdKeys[ui].szName) == 0 ||
 149          strRoot.CmpNoCase(aStdKeys[ui].szShortName) == 0 ) {
 150       hRootKey = aStdKeys[ui].hkey;
 151       break;
 152     }
 153   }
 154
 155   if ( ui == nStdKeys ) {
 156     wxFAIL_MSG("invalid key prefix in wxRegKey::ExtractKeyName.");
 157
 158     hRootKey = HKEY_CLASSES_ROOT;
 159   }
 160   else {
 161     strKey = strKey.After(REG_SEPARATOR);
 162     if ( !strKey.IsEmpty() && strKey.Last() == REG_SEPARATOR )
 163       strKey.Truncate(strKey.Len() - 1);
 164   }
 165
 166   return (wxRegKey::StdKey)(int)hRootKey;
 167 }
 168
 169 wxRegKey::StdKey wxRegKey::GetStdKeyFromHkey(HKEY hkey)
 170 {
 171   for ( uint ui = 0; ui < nStdKeys; ui++ ) {
 172     if ( aStdKeys[ui].hkey == hkey )
 173       return (StdKey)ui;
 174   }
 175
 176   wxFAIL_MSG("non root hkey passed to wxRegKey::GetStdKeyFromHkey.");
 177
 178   return HKCR;
 179 }
 180
 181 // ----------------------------------------------------------------------------
 182 // ctors and dtor
 183 // ----------------------------------------------------------------------------
 184
 185 wxRegKey::wxRegKey()
 186 {
 187   m_hKey = 0;
 188   m_hRootKey = aStdKeys[HKCR].hkey;
 189   m_dwLastError = 0;
 190 }
 191
 192 wxRegKey::wxRegKey(const wxString& strKey) : m_strKey(strKey)
 193 {
 194   m_hRootKey  = aStdKeys[ExtractKeyName(m_strKey)].hkey;
 195   m_hKey      = NULL;
 196   m_dwLastError = 0;
 197 }
 198
 199 // parent is a predefined (and preopened) key
 200 wxRegKey::wxRegKey(StdKey keyParent, const wxString& strKey) : m_strKey(strKey)
 201 {
 202   RemoveTrailingSeparator(m_strKey);
 203   m_hRootKey  = aStdKeys[keyParent].hkey;
 204   m_hKey      = NULL;
 205   m_dwLastError = 0;
 206 }
 207
 208 // parent is a normal regkey
 209 wxRegKey::wxRegKey(const wxRegKey& keyParent, const wxString& strKey)
 210         : m_strKey(keyParent.m_strKey)
 211 {
 212   // combine our name with parent's to get the full name
 213   if ( !strKey.IsEmpty() && strKey[0] != REG_SEPARATOR )
 214       m_strKey  += REG_SEPARATOR;
 215
 216   m_strKey += strKey;
 217   RemoveTrailingSeparator(m_strKey);
 218
 219   m_hRootKey  = keyParent.m_hRootKey;
 220   m_hKey      = NULL;
 221   m_dwLastError = 0;
 222 }
 223
 224 // dtor closes the key releasing system resource
 225 wxRegKey::~wxRegKey()
 226 {
 227   Close();
 228 }
 229
 230 // ----------------------------------------------------------------------------
 231 // change the key name/hkey
 232 // ----------------------------------------------------------------------------
 233
 234 // set the full key name
 235 void wxRegKey::SetName(const wxString& strKey)
 236 {
 237   Close();
 238
 239   m_strKey = strKey;
 240   m_hRootKey = aStdKeys[ExtractKeyName(m_strKey)].hkey;
 241 }
 242
 243 // the name is relative to the parent key
 244 void wxRegKey::SetName(StdKey keyParent, const wxString& strKey)
 245 {
 246   Close();
 247
 248   m_strKey = strKey;
 249   RemoveTrailingSeparator(m_strKey);
 250   m_hRootKey = aStdKeys[keyParent].hkey;
 251 }
 252
 253 // the name is relative to the parent key
 254 void wxRegKey::SetName(const wxRegKey& keyParent, const wxString& strKey)
 255 {
 256   Close();
 257
 258   // combine our name with parent's to get the full name
 259   m_strKey = keyParent.m_strKey;
 260   if ( !strKey.IsEmpty() && strKey[0] != REG_SEPARATOR )
 261     m_strKey += REG_SEPARATOR;
 262   m_strKey += strKey;
 263
 264   RemoveTrailingSeparator(m_strKey);
 265
 266   m_hRootKey = keyParent.m_hRootKey;
 267 }
 268
 269 // hKey should be opened and will be closed in wxRegKey dtor
 270 void wxRegKey::SetHkey(HKEY hKey)
 271 {
 272   Close();
 273
 274   m_hKey = hKey;
 275 }
 276
 277 // ----------------------------------------------------------------------------
 278 // info about the key
 279 // ----------------------------------------------------------------------------
 280
 281 // returns TRUE if the key exists
 282 bool wxRegKey::Exists() const
 283 {
 284   // opened key has to exist, try to open it if not done yet
 285   return IsOpened() ? TRUE : KeyExists(m_hRootKey, m_strKey);
 286 }
 287
 288 // returns the full name of the key (prefix is abbreviated if bShortPrefix)
 289 wxString wxRegKey::GetName(bool bShortPrefix) const
 290 {
 291   StdKey key = GetStdKeyFromHkey(m_hRootKey);
 292   wxString str = bShortPrefix ? aStdKeys[key].szShortName
 293                               : aStdKeys[key].szName;
 294   if ( !m_strKey.IsEmpty() )
 295     str << "\\" << m_strKey;
 296
 297   return str;
 298 }
 299
 300 #ifdef __GNUWIN32__
 301 bool wxRegKey::GetKeyInfo(uint* pnSubKeys,
 302                           uint* pnMaxKeyLen,
 303                           uint* pnValues,
 304                           uint* pnMaxValueLen) const
 305 #else
 306 bool wxRegKey::GetKeyInfo(ulong *pnSubKeys,
 307                           ulong *pnMaxKeyLen,
 308                           ulong *pnValues,
 309                           ulong *pnMaxValueLen) const
 310 #endif
 311 {
 312 #ifdef  __WIN32__
 313   m_dwLastError = ::RegQueryInfoKey
 314                   (
 315                     m_hKey,
 316                     NULL,           // class name
 317                     NULL,           // (ptr to) size of class name buffer
 318                     RESERVED,
 319                     pnSubKeys,      // [out] number of subkeys
 320                     pnMaxKeyLen,    // [out] max length of a subkey name
 321                     NULL,           // longest subkey class name
 322                     pnValues,       // [out] number of values
 323                     pnMaxValueLen,  // [out] max length of a value name
 324                     NULL,           // longest value data
 325                     NULL,           // security descriptor
 326                     NULL            // time of last modification
 327                   );
 328
 329   if ( m_dwLastError != ERROR_SUCCESS ) {
 330     wxLogSysError(m_dwLastError, _("can't get info about registry key '%s'"),
 331                   GetName().c_str());
 332     return FALSE;
 333   }
 334   else
 335     return TRUE;
 336 #else // Win16
 337   wxFAIL_MSG("GetKeyInfo() not implemented");
 338
 339   return FALSE;
 340 #endif
 341 }
 342
 343 // ----------------------------------------------------------------------------
 344 // operations
 345 // ----------------------------------------------------------------------------
 346
 347 // opens key (it's not an error to call Open() on an already opened key)
 348 bool wxRegKey::Open()
 349 {
 350   if ( IsOpened() )
 351     return TRUE;
 352
 353   m_dwLastError = RegOpenKey(m_hRootKey, m_strKey, &m_hKey);
 354   if ( m_dwLastError != ERROR_SUCCESS ) {
 355     wxLogSysError(m_dwLastError, _("can't open registry key '%s'"),
 356                   GetName().c_str());
 357     return FALSE;
 358   }
 359   else
 360     return TRUE;
 361 }
 362
 363 // creates key, failing if it exists and !bOkIfExists
 364 bool wxRegKey::Create(bool bOkIfExists)
 365 {
 366   // check for existence only if asked (i.e. order is important!)
 367   if ( !bOkIfExists && Exists() ) {
 368     return FALSE;
 369   }
 370
 371   if ( IsOpened() )
 372     return TRUE;
 373
 374   m_dwLastError = RegCreateKey(m_hRootKey, m_strKey, &m_hKey);
 375   if ( m_dwLastError != ERROR_SUCCESS ) {
 376     wxLogSysError(m_dwLastError, _("can't create registry key '%s'"),
 377                   GetName().c_str());
 378     return FALSE;
 379   }
 380   else
 381     return TRUE;
 382 }
 383
 384 // close the key, it's not an error to call it when not opened
 385 bool wxRegKey::Close()
 386 {
 387   if ( IsOpened() ) {
 388     m_dwLastError = RegCloseKey(m_hKey);
 389     if ( m_dwLastError != ERROR_SUCCESS ) {
 390       wxLogSysError(m_dwLastError, _("can't close registry key '%s'"),
 391                     GetName().c_str());
 392
 393       m_hKey = 0;
 394       return FALSE;
 395     }
 396     else {
 397       m_hKey = 0;
 398     }
 399   }
 400
 401   return TRUE;
 402 }
 403
 404 // ----------------------------------------------------------------------------
 405 // delete keys/values
 406 // ----------------------------------------------------------------------------
 407 bool wxRegKey::DeleteSelf()
 408 {
 409   {
 410     wxLogNull nolog;
 411     if ( !Open() ) {
 412       // it already doesn't exist - ok!
 413       return TRUE;
 414     }
 415   }
 416
 417   // we can't delete keys while enumerating because it confuses GetNextKey, so
 418   // we first save the key names and then delete them all
 419   wxArrayString astrSubkeys;
 420
 421   wxString strKey;
 422   long lIndex;
 423   bool bCont = GetFirstKey(strKey, lIndex);
 424   while ( bCont ) {
 425     astrSubkeys.Add(strKey);
 426
 427     bCont = GetNextKey(strKey, lIndex);
 428   }
 429
 430   uint nKeyCount = astrSubkeys.Count();
 431   for ( uint nKey = 0; nKey < nKeyCount; nKey++ ) {
 432     wxRegKey key(*this, astrSubkeys[nKey]);
 433     if ( !key.DeleteSelf() )
 434       return FALSE;
 435   }
 436
 437   // now delete this key itself
 438   Close();
 439
 440   m_dwLastError = RegDeleteKey(m_hRootKey, m_strKey);
 441   if ( m_dwLastError != ERROR_SUCCESS ) {
 442     wxLogSysError(m_dwLastError, _("can't delete key '%s'"),
 443                   GetName().c_str());
 444     return FALSE;
 445   }
 446
 447   return TRUE;
 448 }
 449
 450 bool wxRegKey::DeleteKey(const char *szKey)
 451 {
 452   if ( !Open() )
 453     return FALSE;
 454
 455   wxRegKey key(*this, szKey);
 456   return key.DeleteSelf();
 457 }
 458
 459 bool wxRegKey::DeleteValue(const char *szValue)
 460 {
 461   if ( !Open() )
 462     return FALSE;
 463
 464   #ifdef  __WIN32__
 465     m_dwLastError = RegDeleteValue(m_hKey, szValue);
 466     if ( m_dwLastError != ERROR_SUCCESS ) {
 467       wxLogSysError(m_dwLastError, _("can't delete value '%s' from key '%s'"),
 468                     szValue, GetName().c_str());
 469       return FALSE;
 470     }
 471   #else   //WIN16
 472     // named registry values don't exist in Win16 world
 473     wxASSERT( IsEmpty(szValue) );
 474
 475     // just set the (default and unique) value of the key to ""
 476     m_dwLastError = RegSetValue(m_hKey, NULL, REG_SZ, "", RESERVED);
 477     if ( m_dwLastError != ERROR_SUCCESS ) {
 478       wxLogSysError(m_dwLastError, _("can't delete value of key '%s'"),
 479                     GetName().c_str());
 480       return FALSE;
 481     }
 482   #endif  //WIN16/32
 483
 484   return TRUE;
 485 }
 486
 487 // ----------------------------------------------------------------------------
 488 // access to values and subkeys
 489 // ----------------------------------------------------------------------------
 490
 491 // return TRUE if value exists
 492 bool wxRegKey::HasValue(const char *szValue) const
 493 {
 494   #ifdef  __WIN32__
 495     if ( CONST_CAST Open() ) {
 496       return RegQueryValueEx(m_hKey, szValue, RESERVED,
 497                              NULL, NULL, NULL) == ERROR_SUCCESS;
 498     }
 499     else
 500       return FALSE;
 501   #else   // WIN16
 502     // only unnamed value exists
 503     return IsEmpty(szValue);
 504   #endif  // WIN16/32
 505 }
 506
 507 // returns TRUE if this key has any subkeys
 508 bool wxRegKey::HasSubkeys() const
 509 {
 510   // just call GetFirstKey with dummy parameters
 511   wxString str;
 512   long     l;
 513   return CONST_CAST GetFirstKey(str, l);
 514 }
 515
 516 // returns TRUE if given subkey exists
 517 bool wxRegKey::HasSubKey(const char *szKey) const
 518 {
 519   if ( CONST_CAST Open() )
 520     return KeyExists(m_hKey, szKey);
 521   else
 522     return FALSE;
 523 }
 524
 525 wxRegKey::ValueType wxRegKey::GetValueType(const char *szValue)
 526 {
 527   #ifdef  __WIN32__
 528     if ( !Open() )
 529       return Type_None;
 530
 531     DWORD dwType;
 532     m_dwLastError = RegQueryValueEx(m_hKey, szValue, RESERVED,
 533                                     &dwType, NULL, NULL);
 534     if ( m_dwLastError != ERROR_SUCCESS ) {
 535       wxLogSysError(m_dwLastError, _("can't read value of key '%s'"),
 536                     GetName().c_str());
 537       return Type_None;
 538     }
 539
 540     return (ValueType)dwType;
 541   #else   //WIN16
 542     return IsEmpty(szValue) ? Type_String : Type_None;
 543   #endif  //WIN16/32
 544 }
 545
 546 #ifdef  __WIN32__
 547 bool wxRegKey::SetValue(const char *szValue, long lValue)
 548 {
 549   if ( CONST_CAST Open() ) {
 550     m_dwLastError = RegSetValueEx(m_hKey, szValue, RESERVED, REG_DWORD,
 551                                   (RegString)&lValue, sizeof(lValue));
 552     if ( m_dwLastError == ERROR_SUCCESS )
 553       return TRUE;
 554   }
 555
 556   wxLogSysError(m_dwLastError, _("can't set value of '%s'"),
 557                 GetFullName(this, szValue));
 558   return FALSE;
 559 }
 560
 561 bool wxRegKey::QueryValue(const char *szValue, long *plValue) const
 562 {
 563   if ( CONST_CAST Open() ) {
 564     DWORD dwType, dwSize = sizeof(DWORD);
 565     RegString pBuf = (RegString)plValue;
 566     m_dwLastError = RegQueryValueEx(m_hKey, szValue, RESERVED,
 567                                     &dwType, pBuf, &dwSize);
 568     if ( m_dwLastError != ERROR_SUCCESS ) {
 569       wxLogSysError(m_dwLastError, _("can't read value of key '%s'"),
 570                     GetName().c_str());
 571       return FALSE;
 572     }
 573     else {
 574       // check that we read the value of right type
 575       wxASSERT_MSG( dwType == REG_DWORD,
 576                     "Type mismatch in wxRegKey::QueryValue()."  );
 577
 578       return TRUE;
 579     }
 580   }
 581   else
 582     return FALSE;
 583 }
 584
 585 #endif  //Win32
 586
 587 bool wxRegKey::QueryValue(const char *szValue, wxString& strValue) const
 588 {
 589   if ( CONST_CAST Open() ) {
 590     #ifdef  __WIN32__
 591       // first get the type and size of the data
 592       DWORD dwType, dwSize;
 593       m_dwLastError = RegQueryValueEx(m_hKey, szValue, RESERVED,
 594                                       &dwType, NULL, &dwSize);
 595       if ( m_dwLastError == ERROR_SUCCESS ) {
 596         RegString pBuf = (RegString)strValue.GetWriteBuf(dwSize);
 597         m_dwLastError = RegQueryValueEx(m_hKey, szValue, RESERVED,
 598                                         &dwType, pBuf, &dwSize);
 599         strValue.UngetWriteBuf();
 600         if ( m_dwLastError == ERROR_SUCCESS ) {
 601           // check that it was the right type
 602           wxASSERT_MSG( dwType == REG_SZ,
 603                         "Type mismatch in wxRegKey::QueryValue()." );
 604
 605           return TRUE;
 606         }
 607       }
 608     #else   //WIN16
 609       // named registry values don't exist in Win16
 610       wxASSERT( IsEmpty(szValue) );
 611
 612       m_dwLastError = RegQueryValue(m_hKey, 0, strValue.GetWriteBuf(256), &l);
 613       strValue.UngetWriteBuf();
 614       if ( m_dwLastError == ERROR_SUCCESS )
 615         return TRUE;
 616     #endif  //WIN16/32
 617   }
 618
 619   wxLogSysError(m_dwLastError, _("can't read value of '%s'"),
 620                 GetFullName(this, szValue));
 621   return FALSE;
 622 }
 623
 624 bool wxRegKey::SetValue(const char *szValue, const wxString& strValue)
 625 {
 626   if ( CONST_CAST Open() ) {
 627     #ifdef  __WIN32__
 628       m_dwLastError = RegSetValueEx(m_hKey, szValue, RESERVED, REG_SZ,
 629                                     (RegString)strValue.c_str(),
 630                                     strValue.Len() + 1);
 631       if ( m_dwLastError == ERROR_SUCCESS )
 632         return TRUE;
 633     #else   //WIN16
 634       // named registry values don't exist in Win16
 635       wxASSERT( IsEmpty(szValue) );
 636
 637       m_dwLastError = RegSetValue(m_hKey, NULL, REG_SZ, strValue, NULL);
 638       if ( m_dwLastError == ERROR_SUCCESS )
 639         return TRUE;
 640     #endif  //WIN16/32
 641   }
 642
 643   wxLogSysError(m_dwLastError, _("can't set value of '%s'"),
 644                 GetFullName(this, szValue));
 645   return FALSE;
 646 }
 647
 648 wxRegKey::operator wxString() const
 649 {
 650   wxString str;
 651   QueryValue(NULL, str);
 652   return str;
 653 }
 654
 655 // ----------------------------------------------------------------------------
 656 // enumeration
 657 // NB: all these functions require an index variable which allows to have
 658 //     several concurrently running indexations on the same key
 659 // ----------------------------------------------------------------------------
 660
 661 bool wxRegKey::GetFirstValue(wxString& strValueName, long& lIndex)
 662 {
 663   if ( !Open() )
 664     return FALSE;
 665
 666   lIndex = 0;
 667   return GetNextValue(strValueName, lIndex);
 668 }
 669
 670 bool wxRegKey::GetNextValue(wxString& strValueName, long& lIndex) const
 671 {
 672   wxASSERT( IsOpened() );
 673
 674   // are we already at the end of enumeration?
 675   if ( lIndex == -1 )
 676     return FALSE;
 677
 678   #ifdef  __WIN32__
 679     char  szValueName[1024];                  // @@ use RegQueryInfoKey...
 680     DWORD dwValueLen = WXSIZEOF(szValueName);
 681
 682     lIndex++;
 683     m_dwLastError = RegEnumValue(m_hKey, lIndex,
 684                                  szValueName, &dwValueLen,
 685                                  RESERVED,
 686                                  NULL,            // [out] type
 687                                  NULL,            // [out] buffer for value
 688                                  NULL);           // [i/o]  it's length
 689
 690     if ( m_dwLastError != ERROR_SUCCESS ) {
 691       if ( m_dwLastError == ERROR_NO_MORE_ITEMS ) {
 692         m_dwLastError = ERROR_SUCCESS;
 693         lIndex = -1;
 694       }
 695       else {
 696         wxLogSysError(m_dwLastError, _("can't enumerate values of key '%s'"),
 697                       GetName().c_str());
 698       }
 699
 700       return FALSE;
 701     }
 702
 703     strValueName = szValueName;
 704   #else   //WIN16
 705     // only one unnamed value
 706     wxASSERT( lIndex == 0 );
 707
 708     lIndex = -1;
 709     strValueName.Empty();
 710   #endif
 711
 712   return TRUE;
 713 }
 714
 715 bool wxRegKey::GetFirstKey(wxString& strKeyName, long& lIndex)
 716 {
 717   if ( !Open() )
 718     return FALSE;
 719
 720   lIndex = 0;
 721   return GetNextKey(strKeyName, lIndex);
 722 }
 723
 724 bool wxRegKey::GetNextKey(wxString& strKeyName, long& lIndex) const
 725 {
 726   wxASSERT( IsOpened() );
 727
 728   // are we already at the end of enumeration?
 729   if ( lIndex == -1 )
 730     return FALSE;
 731
 732   char szKeyName[_MAX_PATH + 1];
 733   m_dwLastError = RegEnumKey(m_hKey, lIndex++, szKeyName, WXSIZEOF(szKeyName));
 734
 735   if ( m_dwLastError != ERROR_SUCCESS ) {
 736     if ( m_dwLastError == ERROR_NO_MORE_ITEMS ) {
 737       m_dwLastError = ERROR_SUCCESS;
 738       lIndex = -1;
 739     }
 740     else {
 741       wxLogSysError(m_dwLastError, _("can't enumerate subkeys of key '%s'"),
 742                     GetName().c_str());
 743     }
 744
 745     return FALSE;
 746   }
 747
 748   strKeyName = szKeyName;
 749   return TRUE;
 750 }
 751
 752 // ============================================================================
 753 // implementation of global functions
 754 // ============================================================================
 755 bool KeyExists(HKEY hRootKey, const char *szKey)
 756 {
 757   HKEY hkeyDummy;
 758   if ( RegOpenKey(hRootKey, szKey, &hkeyDummy) == ERROR_SUCCESS ) {
 759     RegCloseKey(hkeyDummy);
 760     return TRUE;
 761   }
 762   else
 763     return FALSE;
 764 }
 765
 766 const char *GetFullName(const wxRegKey *pKey, const char *szValue)
 767 {
 768   static wxString s_str;
 769   s_str = pKey->GetName();
 770   if ( !IsEmpty(szValue) )
 771     s_str << "\\" << szValue;
 772
 773   return s_str.c_str();
 774 }
 775
 776 void RemoveTrailingSeparator(wxString& str)
 777 {
 778   if ( !str.IsEmpty() && str.Last() == REG_SEPARATOR )
 779     str.Truncate(str.Len() - 1);
 780 }