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NativeMethods.Constants.cs 3.6 KiB

7 vuotta sitten
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  1. /* Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
  2. *
  3. * Permission is hereby granted, free of charge, to any person obtaining a copy
  4. * of this software and associated documentation files (the "Software"), to deal
  5. * in the Software without restriction, including without limitation the rights
  6. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  7. * copies of the Software, and to permit persons to whom the Software is
  8. * furnished to do so, subject to the following conditions:
  9. *
  10. * The above copyright notice and this permission notice shall be included in
  11. * all copies or substantial portions of the Software.
  12. *
  13. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  18. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  19. * THE SOFTWARE.
  20. */
  21. using System.Text;
  22. namespace Alphaleonis.Win32.Filesystem
  23. {
  24. internal static partial class NativeMethods
  25. {
  26. public static readonly bool IsAtLeastWindows7 = OperatingSystem.IsAtLeast(OperatingSystem.EnumOsName.Windows7);
  27. public static readonly bool IsAtLeastWindowsVista = OperatingSystem.IsAtLeast(OperatingSystem.EnumOsName.WindowsVista);
  28. /// <summary>The FindFirstFileEx function does not query the short file name, improving overall enumeration speed.
  29. /// <para>&#160;</para>
  30. /// <remarks>
  31. /// <para>The data is returned in a <see cref="WIN32_FIND_DATA"/> structure,</para>
  32. /// <para>and cAlternateFileName member is always a NULL string.</para>
  33. /// <para>This value is not supported until Windows Server 2008 R2 and Windows 7.</para>
  34. /// </remarks>
  35. /// </summary>
  36. public static readonly FINDEX_INFO_LEVELS FindexInfoLevels = IsAtLeastWindows7 ? FINDEX_INFO_LEVELS.Basic : FINDEX_INFO_LEVELS.Standard;
  37. /// <summary>Uses a larger buffer for directory queries, which can increase performance of the find operation.</summary>
  38. /// <remarks>This value is not supported until Windows Server 2008 R2 and Windows 7.</remarks>
  39. public static readonly FindExAdditionalFlags LargeCache = IsAtLeastWindows7 ? FindExAdditionalFlags.LargeFetch : FindExAdditionalFlags.None;
  40. /// <summary>DefaultFileBufferSize = 4096; Default type buffer size used for reading and writing files.</summary>
  41. public const int DefaultFileBufferSize = 4096;
  42. /// <summary>DefaultFileEncoding = Encoding.UTF8; Default type of Encoding used for reading and writing files.</summary>
  43. public static readonly Encoding DefaultFileEncoding = Encoding.UTF8;
  44. /// <summary>MaxDirectoryLength = 255</summary>
  45. internal const int MaxDirectoryLength = 255;
  46. /// <summary>MaxPath = 260
  47. /// The specified path, file name, or both exceed the system-defined maximum length.
  48. /// For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.
  49. /// </summary>
  50. internal const int MaxPath = 260;
  51. /// <summary>MaxPathUnicode = 32000</summary>
  52. internal const int MaxPathUnicode = 32000;
  53. /// <summary>When an exception is raised, bit shifting is needed to prevent: "System.OverflowException: Arithmetic operation resulted in an overflow."</summary>
  54. internal const int OverflowExceptionBitShift = 65535;
  55. }
  56. }