IShellFolder::GetUIObjectOf

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C#

I am trying to use the COM interface of a specific file returned by IShellFolder.GetUIObjectOf Method
The below code reports an error "Attempted to read or write protected memory" when it reaches GetUIObjectOf. Please help..

IntPtr pidlroot;
ShellLib.IShellFolder pShellFolder;
pShellFolder = ShellLib.ShellFunctions.GetDesktopFolder();
ShellLib.ShellApi.SHGetFolderLocation(IntPtr.Zero,
                                      (short)ShellLib.ShellApi.CSIDL.CSIDL_DESKTOP,
                                      IntPtr.Zero,
                                      0,
                                      out pidlroot);

string sPath = "C:\\Documents and settings\\giji\\Desktop\\Class1.cs";
uint var = (uint)sPath.Length;
IntPtr pidlchild;
uint pdw=0;
pShellFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, sPath, ref var, out pidlchild,ref pdw);


Guid riid = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
IntPtr ppv;
uint len = 1;
uint reser = 0;
IntPtr[] arry = { pidlchild };
pShellFolder.GetUIObjectOf(IntPtr.Zero, len, arry, riid, ref reser, out ppv);

Is there any other way to get COM Interface of a specific file