SafeFileMapViewHandle.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / Microsoft / Win32 / SafeHandles / SafeFileMapViewHandle.cs / 1 / SafeFileMapViewHandle.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  SafeFileMapViewHandle 
**
** Author: Brian Grunkemeyer ([....])  
**
** A wrapper for handles returned from MapViewOfFile, used
** for shared memory.
** 
** Date:  August 7, 2002
** 
===========================================================*/ 

using System; 
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices; 
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles; 
using System.Runtime.ConstrainedExecution; 

namespace Microsoft.Win32.SafeHandles { 
    [HostProtectionAttribute(MayLeakOnAbort = true)]
    [SuppressUnmanagedCodeSecurityAttribute]
    internal sealed class SafeFileMapViewHandle : SafeHandleZeroOrMinusOneIsInvalid
    { 
        // Note that MapViewOfFile returns 0 on failure
 
        internal SafeFileMapViewHandle() : base(true) {} 

        [DllImport(ExternDll.Kernel32, ExactSpelling=true, CharSet=CharSet.Auto)] 
        internal static extern SafeFileMapViewHandle MapViewOfFile(SafeFileMappingHandle hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, UIntPtr dwNumberOfBytesToMap);

        [DllImport(ExternDll.Kernel32, ExactSpelling=true, SetLastError=true)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        private static extern bool UnmapViewOfFile(IntPtr handle);
 
        override protected bool ReleaseHandle() 
        {
            return UnmapViewOfFile(handle); 
        }

    }
}

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