Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Controls / EnumUnknown.cs / 1305600 / EnumUnknown.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // // // // Description: Helper object implementing IEnumUnknown for enumerating controls // // Source copied from AxContainer.cs // // History // 04/17/05 KusumaV Created // //----------------------------------------------------------------------------- using System; using System.Collections; using System.Diagnostics; using System.Runtime.InteropServices; using Microsoft.Win32; using System.Security; using MS.Win32; namespace MS.Internal.Controls { #region class EnumUnknown internal class EnumUnknown : UnsafeNativeMethods.IEnumUnknown { private Object[] arr; private int loc; private int size; internal EnumUnknown(Object[] arr) { this.arr = arr; this.loc = 0; this.size = (arr == null) ? 0 : arr.Length; } private EnumUnknown(Object[] arr, int loc) : this(arr) { this.loc = loc; } ////// Critical: Takes arbitrary pointers, writes to memory /// [SecurityCritical] unsafe int UnsafeNativeMethods.IEnumUnknown.Next(int celt, IntPtr rgelt, IntPtr pceltFetched) { if (pceltFetched != IntPtr.Zero) Marshal.WriteInt32(pceltFetched, 0, 0); if (celt < 0) { return NativeMethods.E_INVALIDARG; } int fetched = 0; if (this.loc >= this.size) { fetched = 0; } else { for (; this.loc < this.size && fetched < celt; ++(this.loc)) { if (this.arr[this.loc] != null) { Marshal.WriteIntPtr(rgelt, Marshal.GetIUnknownForObject(this.arr[this.loc])); rgelt = (IntPtr)((long)rgelt + (long)sizeof(IntPtr)); ++fetched; } } } if (pceltFetched != IntPtr.Zero) Marshal.WriteInt32(pceltFetched, 0, fetched); if (fetched != celt) { return (NativeMethods.S_FALSE); } return NativeMethods.S_OK; } int UnsafeNativeMethods.IEnumUnknown.Skip(int celt) { this.loc += celt; if (this.loc >= this.size) { return (NativeMethods.S_FALSE); } return NativeMethods.S_OK; } void UnsafeNativeMethods.IEnumUnknown.Reset() { this.loc = 0; } void UnsafeNativeMethods.IEnumUnknown.Clone(out UnsafeNativeMethods.IEnumUnknown ppenum) { ppenum = new EnumUnknown(this.arr, this.loc); } } #endregion class EnumUnknown } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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