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The Labs \ Source Viewer \ SSCLI \ Microsoft.Win32.SafeHandles \ SafeNativeMemoryHandle

SSCLI
  1. // ==++==
  2. //
  3. //
  4. // Copyright (c) 2006 Microsoft Corporation. All rights reserved.
  5. //
  6. // The use and distribution terms for this software are contained in the file
  7. // named license.txt, which can be found in the root of this distribution.
  8. // By using this software in any fashion, you are agreeing to be bound by the
  9. // terms of this license.
  10. //
  11. // You must not remove this notice, or any other, from this software.
  12. //
  13. //
  14. // ==--==
  15. /*============================================================
  16. **
  17. ** Class:  SafeMemoryHandle
  18. **
  19. **
  20. ** This class is wrapper for native (unsafe) memory pointer 
  21. ** allocated using Marshal.AllocHGlobal.
  22. **
  23. **
  24. ===========================================================*/
  25. using System;
  26. using System.Security;
  27. using System.Security.Permissions;
  28. using System.Runtime.InteropServices;
  29. using System.Runtime.CompilerServices;
  30. using System.Runtime.ConstrainedExecution;
  31. using Microsoft.Win32;
  32. using Microsoft.Win32.SafeHandles;
  34. namespace Microsoft.Win32.SafeHandles
  35. {
  36.     [SuppressUnmanagedCodeSecurityAttribute()]
  37.     internal sealed class SafeNativeMemoryHandle : SafeHandleZeroOrMinusOneIsInvalid
  38.     {
  39.         [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
  40.         internal SafeNativeMemoryHandle() : base(true)
  41.         {
  42.         }
  43.        
  44.         [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
  45.         internal SafeNativeMemoryHandle(IntPtr handle, bool ownsHandle) : base(ownsHandle)
  46.         {
  47.             SetHandle(handle);
  48.         }
  49.        
  50.         protected override bool ReleaseHandle()
  51.         {
  52.             if (handle != IntPtr.Zero) {
  53.                 Marshal.FreeHGlobal(handle);
  54.                 handle = IntPtr.Zero;
  55.                 return true;
  56.             }
  57.             return false;
  58.         }
  59.     }
  60. }

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