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PIDL.cs
using System;using System.Collections.Generic;using System.Text;using System.Collections;using System.Runtime.InteropServices;namespace WinShell
{
public class PIDL
{ private IntPtr pidl = IntPtr.Zero; public PIDL(IntPtr pidl, bool clone) { if (clone) this.pidl = ILClone(pidl); else this.pidl = pidl;
} public PIDL(PIDL pidl, bool clone) { if (clone) this.pidl = ILClone(pidl.Ptr); else this.pidl = pidl.Ptr; } public IntPtr Ptr { get { return pidl; } } public void Insert(IntPtr insertPidl) { IntPtr newPidl = ILCombine(insertPidl, pidl); Marshal.FreeCoTaskMem(pidl); pidl = newPidl; } public void Free() { if (pidl != IntPtr.Zero) { Marshal.FreeCoTaskMem(pidl); pidl = IntPtr.Zero; } } private static int ItemIDSize(IntPtr pidl) { if (!pidl.Equals(IntPtr.Zero)) { byte[] buffer = new byte[2]; Marshal.Copy(pidl, buffer, 0, 2); return buffer[1] * 256 + buffer[0]; } else return 0; } private static int ItemIDListSize(IntPtr pidl) { if (pidl.Equals(IntPtr.Zero)) return 0; else { int size = ItemIDSize(pidl); int nextSize = Marshal.ReadByte(pidl, size) + (Marshal.ReadByte(pidl, size + 1) * 256); while (nextSize > 0) { size += nextSize; nextSize = Marshal.ReadByte(pidl, size) + (Marshal.ReadByte(pidl, size + 1) * 256); } return size; } } public static IntPtr ILClone(IntPtr pidl) { int size = ItemIDListSize(pidl); byte[] bytes = new byte[size + 2]; Marshal.Copy(pidl, bytes, 0, size); IntPtr newPidl = Marshal.AllocCoTaskMem(size + 2); Marshal.Copy(bytes, 0, newPidl, size + 2); return newPidl; } public static IntPtr ILCombine(IntPtr pidl1, IntPtr pidl2) { int size1 = ItemIDListSize(pidl1); int size2 = ItemIDListSize(pidl2); IntPtr newPidl = Marshal.AllocCoTaskMem(size1 + size2 + 2); byte[] bytes = new byte[size1 + size2 + 2]; Marshal.Copy(pidl1, bytes, 0, size1); Marshal.Copy(pidl2, bytes, size1, size2); Marshal.Copy(bytes, 0, newPidl, bytes.Length); return newPidl; } }
}private ShellItem m_ParentItem;public ShellItem ParentItem{ get { return m_ParentItem; } set { m_ParentItem = value; }}/**//// <summary>/// 绝对 PIDL/// </summary>public PIDL PIDLFull{ get { PIDL pidlFull = new PIDL(PIDL, true); ShellItem current = ParentItem; while (current != null) { pidlFull.Insert(current.PIDL); current = current.ParentItem; } return pidlFull; }}
