/*
* public ulong RegisterChangeNotify(IntPtr hWnd, IListItemEx item, bool Recursively)
* {
* IntPtr handle = IntPtr.Zero;
* handle = hWnd;
* if (notifyid != 0) return (0);
* var changeentry = new SHChangeNotifyEntry() { pIdl = item.PIDL, Recursively = Recursively, };
* var changenetrys = new SHChangeNotifyEntry[1] { changeentry };
* //changenetrys[0] = changeentry;
*
* notifyid = SHChangeNotifyRegister(
* hWnd,
* (SHCNRF)0x00FF | (SHCNRF)0x0000 | SHCNRF.NewDelivery,
* SHCNE.SHCNE_ALLEVENTS | SHCNE.SHCNE_INTERRUPT,
* WM_SHNOTIFY,
* 1,
* changenetrys);
* return (notifyid);
* }
*/
/// <summary>
/// Unregister the form
/// </summary>
/// <returns>True if successfull</returns>
public Boolean UnregisterChangeNotify()
{
if (notifyid == 0)
{
return(false);
}
if (Shell32.SHChangeNotifyUnregister(notifyid))
{
notifyid = 0;
return(true);
}
return(false);
}
/// <summary>
/// Message received from the WndProc of a registered form
/// </summary>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns>True if this is a new notification</returns>
public bool NotificationReceipt(IntPtr wParam, IntPtr lParam)
{
IntPtr ptr;
uint eventID;
var lockPtr = Shell32.SHChangeNotification_Lock(wParam, (int)lParam, out ptr, out eventID);
try
{
SHNOTIFYSTRUCT shNotify = (SHNOTIFYSTRUCT)Marshal.PtrToStructure(
ptr,
typeof(SHNOTIFYSTRUCT));
NotifyInfos info = new NotifyInfos((SHCNE)(int)eventID);
//System.Windows.Forms.MessageBox.Show(info.Notification.ToString());
//Not supported notifications
//if (info.Notification == SHCNE.SHCNE_FREESPACE ||
// info.Notification == SHCNE.SHCNE_UPDATEIMAGE)
// return (false);
info.Item1 = shNotify.dwItem1;
info.Item2 = shNotify.dwItem2;
// Was this notification in the received notifications ?
if (NotificationsReceived.Contains(info))
{
return(false);
}
NotificationsReceived.Add(info);
}
finally
{
if (lockPtr != IntPtr.Zero)
{
Shell32.SHChangeNotification_Unlock(lockPtr);
}
}
return(true);
//DisplayName1 = GetDisplayNameFromPidl(shNotify.dwItem1);
//DisplayName2 = GetDisplayNameFromPidl(shNotify.dwItem2);
}
