using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Unstub
{
    class ShellNotification
    {
	[DllImport("shell32.dll", CharSet = CharSet.Auto)]
	public static extern Int32 SHParseDisplayName(
	    [MarshalAs(UnmanagedType.LPWStr)] String pszName,
	    IntPtr pbc,
	    out IntPtr ppidl,
	    UInt32 sfgaoIn,
	    out UInt32 psfgaoOut);
	[DllImport("shell32.dll", CharSet = CharSet.Auto)]
	internal static extern void SHChangeNotify(
	    UInt32 wEventId,
	    UInt32 uFlags,
	    IntPtr dwItem1,
	    IntPtr dwItem2);

	[Flags]
	private enum ShellChangeNotificationEvents : uint
	{
	    //...
	    SHCNE_UPDATEITEM = 0x00002000,
	    //...
	}

	private enum ShellChangeNotificationFlags
	{
	    //...
	    SHCNF_FLUSH = 0x1000,
	    //...
	}

	public static void refreshThumbnail(string path)
	{
	    try
	    {
		uint iAttribute;
		IntPtr pidl;
		SHParseDisplayName(path, IntPtr.Zero, out pidl, 0, out iAttribute);
		SHChangeNotify(
		    (uint)ShellChangeNotificationEvents.SHCNE_UPDATEITEM,
		    (uint)ShellChangeNotificationFlags.SHCNF_FLUSH,
		    pidl,
		    IntPtr.Zero);
	    }
	    catch { }
	}
    }
}