Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / infocard / common / managed / HGlobalSafeHandle.cs / 1305376 / HGlobalSafeHandle.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace Microsoft.InfoCards { using System; using System.Runtime.InteropServices; using Microsoft.InfoCards.Diagnostics; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; using System.Security; using IDT=Microsoft.InfoCards.Diagnostics.InfoCardTrace; // // Summary: // Provides a wrapper over HGlobal alloc'd memory guaranteeing that the // contents will be released in the presence of rude app domain and thread aborts. // internal class HGlobalSafeHandle : SafeHandle { public static HGlobalSafeHandle Construct() { return new HGlobalSafeHandle(); } public static HGlobalSafeHandle Construct( string managedString ) { IDT.DebugAssert( !String.IsNullOrEmpty( managedString) , "null string" ); int bytes = (managedString.Length + 1) * 2; return new HGlobalSafeHandle( Marshal.StringToHGlobalUni( managedString ), bytes ); } public static HGlobalSafeHandle Construct( int bytes ) { IDT.DebugAssert( bytes > 0, "attempt to allocate a handle with <= 0 bytes" ); return new HGlobalSafeHandle( Marshal.AllocHGlobal( bytes ), bytes ); } [SuppressUnmanagedCodeSecurity] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] [DllImport("Kernel32.dll", EntryPoint="RtlZeroMemory", SetLastError=false)] public static extern void ZeroMemory( IntPtr dest, Int32 size ); // // The number of bytes allocated. // private int m_bytes; [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success ) ] private HGlobalSafeHandle( IntPtr toManage, int length ) : base( IntPtr.Zero, true ) { m_bytes = length; SetHandle( toManage ); } private HGlobalSafeHandle() : base( IntPtr.Zero, true ) {} public override bool IsInvalid { get { return ( IntPtr.Zero == base.handle ); } } // // Summary: // Zero the string contents and release the handle // protected override bool ReleaseHandle() { IDT.DebugAssert( !IsInvalid, "handle is invalid in release handle" ); IDT.DebugAssert( 0 != m_bytes, "invalid size" ); ZeroMemory( base.handle, m_bytes ); Marshal.FreeHGlobal( base.handle ); return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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