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SafeGlobalMemoryBufferHandle.cs 3.1 KiB

7 年之前
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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;
  22. using System.Runtime.InteropServices;
  23. using System.Text;
  24. namespace Alphaleonis.Win32
  25. {
  26. /// <summary>Represents a block of native memory of a specified size allocated using the LocalAlloc function from Kernel32.dll.</summary>
  27. internal sealed class SafeGlobalMemoryBufferHandle : SafeNativeMemoryBufferHandle
  28. {
  29. /// <summary>Creates new instance with zero IntPtr.</summary>
  30. public SafeGlobalMemoryBufferHandle()
  31. : base(true)
  32. {
  33. }
  34. /// <summary>Initializes a new instance of the <see cref="SafeGlobalMemoryBufferHandle"/> class allocating the specified number of bytes of unmanaged memory.</summary>
  35. /// <param name="capacity">The capacity.</param>
  36. public SafeGlobalMemoryBufferHandle(int capacity) :
  37. base(capacity)
  38. {
  39. SetHandle(Marshal.AllocHGlobal(capacity));
  40. }
  41. private SafeGlobalMemoryBufferHandle(IntPtr buffer, int capacity)
  42. : base(buffer, capacity)
  43. {
  44. }
  45. [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
  46. public static SafeGlobalMemoryBufferHandle FromLong(long? value)
  47. {
  48. if (value.HasValue)
  49. {
  50. var safeBuffer = new SafeGlobalMemoryBufferHandle(Marshal.SizeOf(typeof (long)));
  51. Marshal.WriteInt64(safeBuffer.handle, value.Value);
  52. return safeBuffer;
  53. }
  54. return new SafeGlobalMemoryBufferHandle();
  55. }
  56. public static SafeGlobalMemoryBufferHandle FromStringUni(string str)
  57. {
  58. if (str == null)
  59. throw new ArgumentNullException("str");
  60. return new SafeGlobalMemoryBufferHandle(Marshal.StringToHGlobalUni(str), str.Length*UnicodeEncoding.CharSize + UnicodeEncoding.CharSize);
  61. }
  62. /// <summary>Called when object is disposed or finalized.</summary>
  63. protected override bool ReleaseHandle()
  64. {
  65. Marshal.FreeHGlobal(handle);
  66. return true;
  67. }
  68. }
  69. }