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