NativeStructs.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / interop / NativeStructs.cs / 1471291 / NativeStructs.cs
                        
                        
                            /**************************************************************************\ 
    Copyright Microsoft Corporation. All Rights Reserved.
\**************************************************************************/

// 
// A consolidated file of native structures exposed for interop.
// These may be structs or classes, depending on the calling requirements 
// 
// The naming should generally match the native counterparts.
// The structures may be slightly thicker wrappers to make them 
// easier to consume correctly from .Net code (e.g. hiding resource management)
//

namespace MS.Internal.Interop 
{
    using System; 
    using System.IO; 
    using System.Runtime.InteropServices;
    using System.Runtime.InteropServices.ComTypes; 
    using System.Security;

    // Some COM interfaces and Win32 structures are already declared in the framework.
    // Interesting ones to remember in System.Runtime.InteropServices.ComTypes are: 
    using FILETIME = System.Runtime.InteropServices.ComTypes.FILETIME;
    using IPersistFile = System.Runtime.InteropServices.ComTypes.IPersistFile; 
    using IStream = System.Runtime.InteropServices.ComTypes.IStream; 

    ///  
    /// This class is not safe to use in partial trust.
    /// Critical: This class is a wrapper for a native structure that manages its own resources.
    /// 
    [SecurityCritical] 
    [StructLayout(LayoutKind.Explicit)]
    internal class PROPVARIANT : IDisposable 
    { 
        private static class NativeMethods
        { 
            /// 
            /// Critical: Suppresses unmanaged code security.
            /// 
            [SecurityCritical, SuppressUnmanagedCodeSecurity] 
            [DllImport(MS.Win32.ExternDll.Ole32)]
            internal static extern int PropVariantClear(PROPVARIANT pvar); 
        } 

        [FieldOffset(0)] 
        private ushort vt;
        [FieldOffset(8)]
        private IntPtr pointerVal;
        [FieldOffset(8)] 
        private byte byteVal;
        [FieldOffset(8)] 
        private long longVal; 
        [FieldOffset(8)]
        private short boolVal; 

        /// 
        /// 
        /// Critical: This class is tagged Critical 
        /// TreatAsSafe - This class is only available in full trust.
        ///  
        public VarEnum VarType 
        {
            [SecurityCritical, SecurityTreatAsSafe] 
            get { return (VarEnum)vt; }
        }

        // Right now only using this for strings.  If for some reason we get something else return null. 
        /// 
        /// Critical: This class is tagged Critical 
        /// TreatAsSafe - This class is only available in full trust. 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        public string GetValue()
        {
            if (vt == (ushort)VarEnum.VT_LPWSTR)
            { 
                return Marshal.PtrToStringUni(pointerVal);
            } 
 
            return null;
        } 

        /// 
        /// Critical: This class is tagged Critical
        /// TreatAsSafe - This class is only available in full trust. 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        public void SetValue(bool f) 
        {
            Clear(); 
            vt = (ushort)VarEnum.VT_BOOL;
            boolVal = (short)(f ? -1 : 0);
        }
 
        /// 
        /// Critical: This class is tagged Critical 
        /// TreatAsSafe - This class is only available in full trust. 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        public void SetValue(string val)
        {
            Clear();
            vt = (ushort)VarEnum.VT_LPWSTR; 
            pointerVal = Marshal.StringToCoTaskMemUni(val);
        } 
 
        /// 
        /// Critical - Calls critical PropVariantClear 
        /// TreatAsSafe - This class is only available in full trust.
        /// 
        [SecurityCritical, SecurityTreatAsSafe]
        public void Clear() 
        {
            NativeMethods.PropVariantClear(this); 
        } 

        #region IDisposable Pattern 

        /// 
        /// Critical: This class is tagged Critical
        /// TreatAsSafe - This class is only available in full trust. 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        public void Dispose() 
        {
            Dispose(true); 
            GC.SuppressFinalize(this);
        }

        ///  
        /// Critical: This class is tagged Critical
        /// TreatAsSafe - This class is only available in full trust. 
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        ~PROPVARIANT() 
        {
            Dispose(false);
        }
 
        /// 
        /// Critical: This class is tagged Critical 
        /// TreatAsSafe - This class is only available in full trust. 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        private void Dispose(bool disposing)
        {
            Clear();
        } 

        #endregion 
    } 

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] 
    [BestFitMapping(false)]
    internal class WIN32_FIND_DATAW
    {
        public FileAttributes dwFileAttributes; 
        public FILETIME ftCreationTime;
        public FILETIME ftLastAccessTime; 
        public FILETIME ftLastWriteTime; 
        public int nFileSizeHigh;
        public int nFileSizeLow; 
        public int dwReserved0;
        public int dwReserved1;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
        public string cFileName; 
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
        public string cAlternateFileName; 
    } 

    // New to Win7. 
    [StructLayout(LayoutKind.Sequential)]
    internal struct CHANGEFILTERSTRUCT
    {
        public uint cbSize; 
        public MSGFLTINFO ExtStatus;
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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NativeStructs.cs source code in C# .NET

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