mcs/class/corlib/Microsoft.Win32/Win32RegistryApi.cs

   1 //
   2 // Microsoft.Win32/Win32RegistryApi.cs: wrapper for win32 registry API
   3 //
   4 // Authos:
   5 //      Erik LeBel (eriklebel@yahoo.ca)
   6 //      Jackson Harper (jackson@ximian.com)
   7 //      Miguel de Icaza (miguel@gnome.org)
   8 //
   9 // Copyright (C) Erik LeBel 2004
  10 // (C) 2004, 2005 Novell, Inc (http://www.novell.com)
  11 //
  12
  13 //
  14 // Copyright (C) 2004, 2005 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 #if !MOBILE
  37
  38 using System;
  39 using System.Collections;
  40 using System.Collections.Generic;
  41 using System.IO;
  42 using System.Runtime.InteropServices;
  43 using System.Security;
  44 using System.Text;
  45 using Microsoft.Win32.SafeHandles;
  46
  47 namespace Microsoft.Win32
  48 {
  49         /// <summary>
  50         ///     Function stubs, constants and helper functions for
  51         ///     the Win32 registry manipulation utilities.
  52         /// </summary>
  53         internal class Win32RegistryApi : IRegistryApi
  54         {
  55                 // bit masks for registry key open access permissions
  56                 const int OpenRegKeyRead = 0x00020019;
  57                 const int OpenRegKeyWrite = 0x00020006;
  58
  59                 // FIXME must be a way to determin this dynamically?
  60                 const int Int32ByteSize = 4;
  61                 const int Int64ByteSize = 8;
  62
  63                 // FIXME this is hard coded on Mono, can it be determined dynamically?
  64                 readonly int NativeBytesPerCharacter = Marshal.SystemDefaultCharSize;
  65
  66                 const int RegOptionsNonVolatile = 0x00000000;
  67                 const int RegOptionsVolatile = 0x00000001;
  68
  69                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegCreateKeyEx")]
  70                 static extern int RegCreateKeyEx (IntPtr keyBase, string keyName, int reserved,
  71                         IntPtr lpClass, int options, int access, IntPtr securityAttrs,
  72                         out IntPtr keyHandle, out int disposition);
  73
  74                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegCloseKey")]
  75                 static extern int RegCloseKey (IntPtr keyHandle);
  76
  77                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode)]
  78                 static extern int RegConnectRegistry (string machineName, IntPtr hKey,
  79                                 out IntPtr keyHandle);
  80
  81                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegFlushKey")]
  82                 private static extern int RegFlushKey (IntPtr keyHandle);
  83
  84                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegOpenKeyEx")]
  85                 private static extern int RegOpenKeyEx (IntPtr keyBase,
  86                                 string keyName, IntPtr reserved, int access,
  87                                 out IntPtr keyHandle);
  88
  89                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegDeleteKey")]
  90                 private static extern int RegDeleteKey (IntPtr keyHandle, string valueName);
  91
  92                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegDeleteValue")]
  93                 private static extern int RegDeleteValue (IntPtr keyHandle, string valueName);
  94
  95                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegEnumKey")]
  96                 private static extern int RegEnumKey (IntPtr keyBase, int index, StringBuilder nameBuffer, int bufferLength);
  97
  98                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegEnumValue")]
  99                 private static extern int RegEnumValue (IntPtr keyBase,
 100                                 int index, StringBuilder nameBuffer,
 101                                 ref int nameLength, IntPtr reserved,
 102                                 ref RegistryValueKind type, IntPtr data, IntPtr dataLength);
 103
 104 //              [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegSetValueEx")]
 105 //              private static extern int RegSetValueEx (IntPtr keyBase,
 106 //                              string valueName, IntPtr reserved, RegistryValueKind type,
 107 //                              StringBuilder data, int rawDataLength);
 108
 109                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegSetValueEx")]
 110                 private static extern int RegSetValueEx (IntPtr keyBase,
 111                                 string valueName, IntPtr reserved, RegistryValueKind type,
 112                                 string data, int rawDataLength);
 113
 114                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegSetValueEx")]
 115                 private static extern int RegSetValueEx (IntPtr keyBase,
 116                                 string valueName, IntPtr reserved, RegistryValueKind type,
 117                                 byte[] rawData, int rawDataLength);
 118
 119                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegSetValueEx")]
 120                 private static extern int RegSetValueEx (IntPtr keyBase,
 121                                 string valueName, IntPtr reserved, RegistryValueKind type,
 122                                 ref int data, int rawDataLength);
 123
 124                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegSetValueEx")]
 125                 private static extern int RegSetValueEx (IntPtr keyBase,
 126                                 string valueName, IntPtr reserved, RegistryValueKind type,
 127                                 ref long data, int rawDataLength);
 128
 129                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegQueryValueEx")]
 130                 private static extern int RegQueryValueEx (IntPtr keyBase,
 131                                 string valueName, IntPtr reserved, ref RegistryValueKind type,
 132                                 IntPtr zero, ref int dataSize);
 133
 134                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegQueryValueEx")]
 135                 private static extern int RegQueryValueEx (IntPtr keyBase,
 136                                 string valueName, IntPtr reserved, ref RegistryValueKind type,
 137                                 [Out] byte[] data, ref int dataSize);
 138
 139                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegQueryValueEx")]
 140                 private static extern int RegQueryValueEx (IntPtr keyBase,
 141                                 string valueName, IntPtr reserved, ref RegistryValueKind type,
 142                                 ref int data, ref int dataSize);
 143
 144                 [DllImport ("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegQueryValueEx")]
 145                 private static extern int RegQueryValueEx (IntPtr keyBase,
 146                                 string valueName, IntPtr reserved, ref RegistryValueKind type,
 147                                 ref long data, ref int dataSize);
 148
 149                 // Returns our handle from the RegistryKey
 150                 public IntPtr GetHandle (RegistryKey key)
 151                 {
 152                         return (IntPtr) key.InternalHandle;
 153                 }
 154
 155                 static bool IsHandleValid (RegistryKey key)
 156                 {
 157                         return key.InternalHandle != null;
 158                 }
 159
 160                 public RegistryValueKind GetValueKind (RegistryKey rkey, string name)
 161                 {
 162                         RegistryValueKind type = 0;
 163                         int size = 0;
 164                         IntPtr handle = GetHandle (rkey);
 165                         int result = RegQueryValueEx (handle, name, IntPtr.Zero, ref type, IntPtr.Zero, ref size);
 166
 167                         if (result == Win32ResultCode.FileNotFound || result == Win32ResultCode.MarkedForDeletion)
 168                                 return RegistryValueKind.Unknown;
 169
 170                         return type;
 171                 }
 172
 173                 /// <summary>
 174                 /// Acctually read a registry value. Requires knowledge of the
 175                 /// value's type and size.
 176                 /// </summary>
 177                 public object GetValue (RegistryKey rkey, string name, object defaultValue, RegistryValueOptions options)
 178                 {
 179                         RegistryValueKind type = 0;
 180                         int size = 0;
 181                         object obj = null;
 182                         IntPtr handle = GetHandle (rkey);
 183                         int result = RegQueryValueEx (handle, name, IntPtr.Zero, ref type, IntPtr.Zero, ref size);
 184
 185                         if (result == Win32ResultCode.FileNotFound || result == Win32ResultCode.MarkedForDeletion) {
 186                                 return defaultValue;
 187                         }
 188
 189                         if (result != Win32ResultCode.MoreData && result != Win32ResultCode.Success ) {
 190                                 GenerateException (result);
 191                         }
 192
 193                         if (type == RegistryValueKind.String) {
 194                                 byte[] data;
 195                                 result = GetBinaryValue (rkey, name, type, out data, size);
 196                                 obj = RegistryKey.DecodeString (data);
 197                         } else if (type == RegistryValueKind.ExpandString) {
 198                                 byte [] data;
 199                                 result = GetBinaryValue (rkey, name, type, out data, size);
 200                                 obj = RegistryKey.DecodeString (data);
 201                                 if ((options & RegistryValueOptions.DoNotExpandEnvironmentNames) == 0)
 202                                         obj = Environment.ExpandEnvironmentVariables ((string) obj);
 203                         } else if (type == RegistryValueKind.DWord) {
 204                                 int data = 0;
 205                                 result = RegQueryValueEx (handle, name, IntPtr.Zero, ref type, ref data, ref size);
 206                                 obj = data;
 207                         } else if (type == RegistryValueKind.QWord) {
 208                                 long data = 0;
 209                                 result = RegQueryValueEx (handle, name, IntPtr.Zero, ref type, ref data, ref size);
 210                                 obj = data;
 211                         } else if (type == RegistryValueKind.Binary) {
 212                                 byte[] data;
 213                                 result = GetBinaryValue (rkey, name, type, out data, size);
 214                                 obj = data;
 215                         } else if (type == RegistryValueKind.MultiString) {
 216                                 obj = null;
 217                                 byte[] data;
 218                                 result = GetBinaryValue (rkey, name, type, out data, size);
 219
 220                                 if (result == Win32ResultCode.Success)
 221                                         obj = RegistryKey.DecodeString (data).Split ('\0');
 222                         } else {
 223                                 // should never get here
 224                                 throw new SystemException ();
 225                         }
 226
 227                         // check result codes again:
 228                         if (result != Win32ResultCode.Success)
 229                         {
 230                                 GenerateException (result);
 231                         }
 232
 233
 234                         return obj;
 235                 }
 236
 237                 //
 238                 // This version has to do extra checking, make sure that the requested
 239                 // valueKind matches the type of the value being stored
 240                 //
 241                 public void SetValue (RegistryKey rkey, string name, object value, RegistryValueKind valueKind)
 242                 {
 243                         Type type = value.GetType ();
 244                         IntPtr handle = GetHandle (rkey);
 245
 246                         switch (valueKind) {
 247                         case RegistryValueKind.QWord:
 248                                 try {
 249                                         long rawValue = Convert.ToInt64 (value);
 250                                         CheckResult (RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.QWord, ref rawValue, Int64ByteSize));
 251                                         return;
 252                                 } catch (OverflowException) {
 253                                 }
 254                                 break;
 255                         case RegistryValueKind.DWord:
 256                                 try {
 257                                         int rawValue = Convert.ToInt32 (value);
 258                                         CheckResult (RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.DWord, ref rawValue, Int32ByteSize));
 259                                         return;
 260                                 } catch (OverflowException) {
 261                                 }
 262                                 break;
 263                         case RegistryValueKind.Binary:
 264                                 if (type == typeof (byte[])) {
 265                                         byte[] rawValue = (byte[]) value;
 266                                         CheckResult (RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.Binary, rawValue, rawValue.Length));
 267                                         return;
 268                                 }
 269                                 break;
 270                         case RegistryValueKind.MultiString:
 271                                 if (type == typeof (string[])) {
 272                                         string[] vals = (string[]) value;
 273                                         StringBuilder fullStringValue = new StringBuilder ();
 274                                         foreach (string v in vals)
 275                                         {
 276                                                 fullStringValue.Append (v);
 277                                                 fullStringValue.Append ('\0');
 278                                         }
 279                                         fullStringValue.Append ('\0');
 280
 281                                         byte[] rawValue = Encoding.Unicode.GetBytes (fullStringValue.ToString ());
 282
 283                                         CheckResult (RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.MultiString, rawValue, rawValue.Length));
 284                                         return;
 285                                 }
 286                                 break;
 287                         case RegistryValueKind.String:
 288                         case RegistryValueKind.ExpandString:
 289                                 if (type == typeof (string)) {
 290                                         string rawValue = String.Format ("{0}{1}", value, '\0');
 291                                         CheckResult (RegSetValueEx (handle, name, IntPtr.Zero, valueKind, rawValue,
 292                                                                 rawValue.Length * NativeBytesPerCharacter));
 293                                         return;
 294                                 }
 295                                 break;
 296                         default:
 297                                 if (type.IsArray) {
 298                                         throw new ArgumentException ("Only string and byte arrays can written as registry values");
 299                                 }
 300                                 break;
 301                         }
 302
 303                         throw new ArgumentException ("Type does not match the valueKind");
 304                 }
 305
 306                 public void SetValue (RegistryKey rkey, string name, object value)
 307                 {
 308                         Type type = value.GetType ();
 309                         int result;
 310                         IntPtr handle = GetHandle (rkey);
 311
 312                         if (type == typeof (int)) {
 313                                 int rawValue = (int)value;
 314                                 result = RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.DWord, ref rawValue, Int32ByteSize);
 315                         } else if (type == typeof (byte[])) {
 316                                 byte[] rawValue = (byte[]) value;
 317                                 result = RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.Binary, rawValue, rawValue.Length);
 318                         } else if (type == typeof (string[])) {
 319                                 string[] vals = (string[]) value;
 320                                 StringBuilder fullStringValue = new StringBuilder ();
 321                                 foreach (string v in vals)
 322                                 {
 323                                         fullStringValue.Append (v);
 324                                         fullStringValue.Append ('\0');
 325                                 }
 326                                 fullStringValue.Append ('\0');
 327
 328                                 byte[] rawValue = Encoding.Unicode.GetBytes (fullStringValue.ToString ());
 329
 330                                 result = RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.MultiString, rawValue, rawValue.Length);
 331                         } else if (type.IsArray) {
 332                                 throw new ArgumentException ("Only string and byte arrays can written as registry values");
 333                         } else {
 334                                 string rawValue = String.Format ("{0}{1}", value, '\0');
 335                                 result = RegSetValueEx (handle, name, IntPtr.Zero, RegistryValueKind.String, rawValue,
 336                                                         rawValue.Length * NativeBytesPerCharacter);
 337                         }
 338
 339                         // handle the result codes
 340                         if (result != Win32ResultCode.Success)
 341                         {
 342                                 GenerateException (result);
 343                         }
 344                 }
 345
 346                 /// <summary>
 347                 ///     Get a binary value.
 348                 /// </summary>
 349                 private int GetBinaryValue (RegistryKey rkey, string name, RegistryValueKind type, out byte[] data, int size)
 350                 {
 351                         byte[] internalData = new byte [size];
 352                         IntPtr handle = GetHandle (rkey);
 353                         int result = RegQueryValueEx (handle, name, IntPtr.Zero, ref type, internalData, ref size);
 354                         data = internalData;
 355                         return result;
 356                 }
 357
 358
 359                 // Arbitrary max size for key/values names that can be fetched.
 360                 // .NET framework SDK docs say that the max name length that can
 361                 // be used is 255 characters, we'll allow for a bit more.
 362                 const int BufferMaxLength = 1024;
 363
 364                 public int SubKeyCount (RegistryKey rkey)
 365                 {
 366                         int index;
 367                         StringBuilder stringBuffer = new StringBuilder (BufferMaxLength);
 368                         IntPtr handle = GetHandle (rkey);
 369
 370                         for (index = 0; true; index ++) {
 371                                 int result = RegEnumKey (handle, index, stringBuffer,
 372                                         stringBuffer.Capacity);
 373
 374                                 if (result == Win32ResultCode.Success)
 375                                         continue;
 376
 377                                 if (result == Win32ResultCode.NoMoreEntries)
 378                                         break;
 379
 380                                 // something is wrong!!
 381                                 GenerateException (result);
 382                         }
 383                         return index;
 384                 }
 385
 386                 public int ValueCount (RegistryKey rkey)
 387                 {
 388                         int index, result, bufferCapacity;
 389                         RegistryValueKind type;
 390                         StringBuilder buffer = new StringBuilder (BufferMaxLength);
 391
 392                         IntPtr handle = GetHandle (rkey);
 393                         for (index = 0; true; index ++) {
 394                                 type = 0;
 395                                 bufferCapacity = buffer.Capacity;
 396                                 result = RegEnumValue (handle, index,
 397                                                        buffer, ref bufferCapacity,
 398                                                        IntPtr.Zero, ref type,
 399                                                        IntPtr.Zero, IntPtr.Zero);
 400
 401                                 if (result == Win32ResultCode.Success || result == Win32ResultCode.MoreData)
 402                                         continue;
 403
 404                                 if (result == Win32ResultCode.NoMoreEntries)
 405                                         break;
 406
 407                                 // something is wrong
 408                                 GenerateException (result);
 409                         }
 410                         return index;
 411                 }
 412
 413                 public RegistryKey OpenRemoteBaseKey (RegistryHive hKey, string machineName)
 414                 {
 415                         IntPtr handle = new IntPtr ((int) hKey);
 416
 417                         IntPtr keyHandle;
 418                         int result = RegConnectRegistry (machineName, handle, out keyHandle);
 419                         if (result != Win32ResultCode.Success)
 420                                 GenerateException (result);
 421
 422                         return new RegistryKey (hKey, keyHandle, true);
 423                 }
 424
 425                 public RegistryKey OpenSubKey (RegistryKey rkey, string keyName, bool writable)
 426                 {
 427                         int access = OpenRegKeyRead;
 428                         if (writable) access |= OpenRegKeyWrite;
 429                         IntPtr handle = GetHandle (rkey);
 430
 431                         IntPtr subKeyHandle;
 432                         int result = RegOpenKeyEx (handle, keyName, IntPtr.Zero, access, out subKeyHandle);
 433
 434                         if (result == Win32ResultCode.FileNotFound || result == Win32ResultCode.MarkedForDeletion)
 435                                 return null;
 436
 437                         if (result != Win32ResultCode.Success)
 438                                 GenerateException (result);
 439
 440                         return new RegistryKey (subKeyHandle, CombineName (rkey, keyName), writable);
 441                 }
 442
 443                 public void Flush (RegistryKey rkey)
 444                 {
 445                         if (!IsHandleValid (rkey))
 446                                 return;
 447                         IntPtr handle = GetHandle (rkey);
 448                         RegFlushKey (handle);
 449                 }
 450
 451                 public void Close (RegistryKey rkey)
 452                 {
 453                         if (!IsHandleValid (rkey))
 454                                 return;
 455                         SafeRegistryHandle safe_handle = rkey.Handle;
 456                         if (safe_handle != null) {
 457                                 // closes the unmanaged pointer for us.
 458                                 safe_handle.Close ();
 459                                 return;
 460                         }
 461                         IntPtr handle = GetHandle (rkey);
 462                         RegCloseKey (handle);
 463                 }
 464
 465                 public RegistryKey FromHandle (SafeRegistryHandle handle)
 466                 {
 467                         // At this point we can't tell whether the key is writable
 468                         // or not (nor the name), so we let the error check code handle it later, as
 469                         // .Net seems to do.
 470                         return new RegistryKey (handle.DangerousGetHandle (), String.Empty, true);
 471                 }
 472
 473                 public RegistryKey CreateSubKey (RegistryKey rkey, string keyName)
 474                 {
 475                         IntPtr handle = GetHandle (rkey);
 476                         IntPtr subKeyHandle;
 477                         int disposition;
 478                         int result = RegCreateKeyEx (handle , keyName, 0, IntPtr.Zero,
 479                                 RegOptionsNonVolatile,
 480                                 OpenRegKeyRead | OpenRegKeyWrite, IntPtr.Zero, out subKeyHandle, out disposition);
 481
 482                         if (result != Win32ResultCode.Success) {
 483                                 GenerateException (result);
 484                         }
 485
 486                         return new RegistryKey (subKeyHandle, CombineName (rkey, keyName),
 487                                 true);
 488                 }
 489
 490                 public RegistryKey CreateSubKey (RegistryKey rkey, string keyName, RegistryOptions options)
 491                 {
 492                         IntPtr handle = GetHandle (rkey);
 493                         IntPtr subKeyHandle;
 494                         int disposition;
 495                         int result = RegCreateKeyEx (handle , keyName, 0, IntPtr.Zero,
 496                                 options == RegistryOptions.Volatile ? RegOptionsVolatile : RegOptionsNonVolatile,
 497                                 OpenRegKeyRead | OpenRegKeyWrite, IntPtr.Zero, out subKeyHandle, out disposition);
 498
 499                         if (result != Win32ResultCode.Success)
 500                                 GenerateException (result);
 501
 502                         return new RegistryKey (subKeyHandle, CombineName (rkey, keyName),
 503                                 true);
 504                 }
 505
 506                 public void DeleteKey (RegistryKey rkey, string keyName, bool shouldThrowWhenKeyMissing)
 507                 {
 508                         IntPtr handle = GetHandle (rkey);
 509                         int result = RegDeleteKey (handle, keyName);
 510
 511                         if (result == Win32ResultCode.FileNotFound) {
 512                                 if (shouldThrowWhenKeyMissing)
 513                                         throw new ArgumentException ("key " + keyName);
 514                                 return;
 515                         }
 516
 517                         if (result != Win32ResultCode.Success)
 518                                 GenerateException (result);
 519                 }
 520
 521                 public void DeleteValue (RegistryKey rkey, string value, bool shouldThrowWhenKeyMissing)
 522                 {
 523                         IntPtr handle = GetHandle (rkey);
 524                         int result = RegDeleteValue (handle, value);
 525
 526                         if (result == Win32ResultCode.MarkedForDeletion)
 527                                 return;
 528
 529                         if (result == Win32ResultCode.FileNotFound){
 530                                 if (shouldThrowWhenKeyMissing)
 531                                         throw new ArgumentException ("value " + value);
 532                                 return;
 533                         }
 534
 535                         if (result != Win32ResultCode.Success)
 536                                 GenerateException (result);
 537                 }
 538
 539                 public string [] GetSubKeyNames (RegistryKey rkey)
 540                 {
 541                         IntPtr handle = GetHandle (rkey);
 542                         StringBuilder buffer = new StringBuilder (BufferMaxLength);
 543                         var keys = new List<string> ();
 544
 545                         for (int index = 0; true; index ++) {
 546                                 int result = RegEnumKey (handle, index, buffer, buffer.Capacity);
 547
 548                                 if (result == Win32ResultCode.Success) {
 549                                         keys.Add (buffer.ToString ());
 550                                         buffer.Length = 0;
 551                                         continue;
 552                                 }
 553
 554                                 if (result == Win32ResultCode.NoMoreEntries)
 555                                         break;
 556
 557                                 // should not be here!
 558                                 GenerateException (result);
 559                         }
 560                         return keys.ToArray ();
 561                 }
 562
 563
 564                 public string [] GetValueNames (RegistryKey rkey)
 565                 {
 566                         IntPtr handle = GetHandle (rkey);
 567                         var values = new List<string> ();
 568
 569                         for (int index = 0; true; index ++)
 570                         {
 571                                 StringBuilder buffer = new StringBuilder (BufferMaxLength);
 572                                 int bufferCapacity = buffer.Capacity;
 573                                 RegistryValueKind type = 0;
 574
 575                                 int result = RegEnumValue (handle, index, buffer, ref bufferCapacity,
 576                                                         IntPtr.Zero, ref type, IntPtr.Zero, IntPtr.Zero);
 577
 578                                 if (result == Win32ResultCode.Success || result == Win32ResultCode.MoreData) {
 579                                         values.Add (buffer.ToString ());
 580                                         continue;
 581                                 }
 582
 583                                 if (result == Win32ResultCode.NoMoreEntries)
 584                                         break;
 585
 586                                 GenerateException (result);
 587                         }
 588
 589                         return values.ToArray ();
 590                 }
 591
 592                 private void CheckResult (int result)
 593                 {
 594                         if (result != Win32ResultCode.Success) {
 595                                 GenerateException (result);
 596                         }
 597                 }
 598
 599                 /// <summary>
 600                 /// convert a win32 error code into an appropriate exception.
 601                 /// </summary>
 602                 private void GenerateException (int errorCode)
 603                 {
 604                         switch (errorCode) {
 605                                 case Win32ResultCode.FileNotFound:
 606                                 case Win32ResultCode.InvalidParameter:
 607                                         throw new ArgumentException ();
 608                                 case Win32ResultCode.AccessDenied:
 609                                         throw new SecurityException ();
 610                                 case Win32ResultCode.NetworkPathNotFound:
 611                                         throw new IOException ("The network path was not found.");
 612                                 case Win32ResultCode.InvalidHandle:
 613                                         throw new IOException ("Invalid handle.");
 614                                 case Win32ResultCode.MarkedForDeletion:
 615                                         throw RegistryKey.CreateMarkedForDeletionException ();
 616                                 case Win32ResultCode.ChildMustBeVolatile:
 617                                         throw new IOException ("Cannot create a stable subkey under a volatile parent key.");
 618                                 default:
 619                                         // unidentified system exception
 620                                         throw new SystemException ();
 621                         }
 622                 }
 623
 624                 public string ToString (RegistryKey rkey)
 625                 {
 626                         return rkey.Name;
 627                 }
 628
 629                 /// <summary>
 630                 ///     utility: Combine the sub key name to the current name to produce a
 631                 ///     fully qualified sub key name.
 632                 /// </summary>
 633                 internal static string CombineName (RegistryKey rkey, string localName)
 634                 {
 635                         return String.Concat (rkey.Name, "\\", localName);
 636                 }
 637         }
 638 }
 639
 640 #endif // MOBILE
 641