C#

[Guid("000214F2-0000-0000-C000-000000000046"),
 InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
 ComImport]
public interface IEnumIDList
{
  [PreserveSig] int Next(ulong celt, IntPtr[] rgelt, out ulong pceltFetched);
  [PreserveSig] int Skip(ulong celt);
  [PreserveSig] int Reset();
  [PreserveSig] int Clone(out IEnumIDList ppenum);
}

<br />
public static IEnumIDList GetEnumIDList(IntPtr ptrEnumIDList)<br />
		{<br />
			System.Type shellEnumIDListType = System.Type.GetType("JSoftware.CustomTools.ShellLib.IEnumIDList");<br />
			Object obj = Marshal.GetTypedObjectForIUnknown(ptrEnumIDList, shellEnumIDListType);<br />
			IEnumIDList RetVal = (IEnumIDList)obj;<br />
			return RetVal;<br />
		}<br />
<br />
		public static String[] GetSubFolders(IEnumIDList EnumIDList)<br />
		{<br />
			UInt32 celt = 10;<br />
			IntPtr[] ptrList = new IntPtr[celt];<br />
			UInt32 count = 5;<br />
<br />
			String[] PathList;<br />
<br />
			IShellFolder iSubFolder;<br />
			IntPtr ptrRelative = IntPtr.Zero;<br />
			IntPtr ptrSubFolder;<br />
			ShellApi.STRRET ptrData;<br />
<br />
			EnumIDList.Reset();<br />
<br />
			if (EnumIDList.Next(celt, ptrList, out count) == 0)<br />
			{<br />
				PathList = new String[count];<br />
				for (UInt32 i = 0; i < count; i++)<br />
				{<br />
					ShellApi.SHBindToParent(ptrList[i], ShellGUIDs.IID_IShellFolder, out ptrSubFolder, ref ptrRelative);<br />
					iSubFolder = GetShellFolder(ptrSubFolder);<br />
					iSubFolder.GetDisplayNameOf(ptrRelative, (uint)ShellApi.SHGNO.SHGDN_NORMAL, out ptrData);<br />
					ShellApi.StrRetToBSTR(ref ptrData, ptrList[i], out PathList[i]);<br />
				}<br />
				return PathList;<br />
			}<br />
			return null;<br />
		}<br />

<br />
private void GetMainFolders()<br />
{<br />
DummyTreeNode RootNode;<br />
IntPtr ptrRootFolder;<br />
ShellApi.SHGetFolderLocation(this.Handle, (short)ShellApi.CSIDL.CSIDL_DRIVES, IntPtr.Zero, 0, out ptrRootFolder);<br />
IShellFolder iRootFolder= ShellFunctions.GetShellFolder(ptrRootFolder);<br />
				IntPtr ptrFoldersList;<br />
<br />
				ShellApi.STRRET iInfo;<br />
				iRootFolder.EnumObjects(this.Handle, (Int32)ShellApi.SHCONTF.SHCONTF_FOLDERS | (Int32)ShellApi.SHCONTF.SHCONTF_NONFOLDERS, out ptrFoldersList);<br />
IEnumIDList iFoldersList = ShellFunctions.GetEnumIDList(ptrFoldersList);<br />
RootNode = (DummyTreeNode)Nodes[0];<br />
RootNode.AddSubFolders(iFoldersList);<br />
}<br />
<br />
public void AddSubFolders(IEnumIDList EnumIDList)<br />
		{<br />
			try<br />
			{<br />
				String[] SubFolders = ShellFunctions.GetSubFolders(EnumIDList);<br />
				for (int i = 0; i < SubFolders.Length; i++)<br />
				{<br />
					this.Nodes.Add(new DummyTreeNode(SubFolders[i]));<br />
				}<br />
					<br />
			}<br />
			catch (Exception e)<br />
			{<br />
				System.Windows.Forms.MessageBox.Show(e.Message);<br />
			}<br />
		}<br />
<br />

<br />
public static IShellFolder GetShellFolder(IntPtr ptrShellFolder)<br />
		{<br />
			System.Type shellFolderType = GetShellFolderType();<br />
			Object obj = Marshal.GetTypedObjectForIUnknown(ptrShellFolder, shellFolderType);<br />
			IShellFolder RetVal = (IShellFolder)obj;<br />
			return RetVal;<br />
		}<br />
<br />
public static Type GetShellFolderType()<br />
		{<br />
			System.Type shellFolderType = System.Type.GetType("JSoftware.CustomTools.ShellLib.IShellFolder");<br />
			return shellFolderType;<br />
		}<br />

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