CoTaskMemUnicodeSafeHandle.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Diagnostics / Eventing / Reader / CoTaskMemUnicodeSafeHandle.cs / 1305376 / CoTaskMemUnicodeSafeHandle.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class: CoTaskMemUnicodeSafeHandle 
**
** Purpose: 
** This internal class is a SafeHandle implementation over a
** native CoTaskMem allocated via SecureStringToCoTaskMemUnicode.
**
============================================================*/ 
using System;
using System.Runtime.InteropServices; 
using System.Security.Permissions; 

namespace System.Diagnostics.Eventing.Reader { 

    //
    // Marked as SecurityCritical due to link demands from inherited
    // SafeHandle members. 
    //
#pragma warning disable 618    // Have not migrated to v4 transparency yet 
    [System.Security.SecurityCritical(System.Security.SecurityCriticalScope.Everything)] 
#pragma warning restore 618
    internal sealed class CoTaskMemUnicodeSafeHandle : SafeHandle { 

        internal CoTaskMemUnicodeSafeHandle()
            : base(IntPtr.Zero, true) {
        } 

        internal CoTaskMemUnicodeSafeHandle(IntPtr handle, bool ownsHandle) 
            : base(IntPtr.Zero, ownsHandle) { 
            SetHandle(handle);
        } 

        internal void SetMemory(IntPtr handle) {
            SetHandle(handle);
        } 

        internal IntPtr GetMemory() { 
            return handle; 
        }
 

        public override bool IsInvalid {
            get {
                return IsClosed || handle == IntPtr.Zero; 
            }
        } 
 
        protected override bool ReleaseHandle() {
            Marshal.ZeroFreeCoTaskMemUnicode(handle); 
            handle = IntPtr.Zero;
            return true;
        }
 
        // DONT compare CoTaskMemUnicodeSafeHandle with CoTaskMemUnicodeSafeHandle.Zero
        // use IsInvalid instead. Zero is provided where a NULL handle needed 
        public static CoTaskMemUnicodeSafeHandle Zero { 
            get {
                return new CoTaskMemUnicodeSafeHandle(); 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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