public FileWatch(Form form, string path, string filter)
{
Path = path;
Filter = filter;
_form = form;
_watcher = new FileSystemWatcher {
Path = path, Filter = filter
};
_watcher.Changed += (o, args) => _form.Invoke((MethodInvoker) delegate
{
_lastSeen[args.FullPath] = DateTime.Now;
if (_timer == null)
{
_timer = new Timer {
Interval = 500
};
_timer.Tick += (sender, eventArgs) => {
var now = DateTime.Now;
var toRemove = new List <string>();
foreach (var kv in _lastSeen)
{
// check if it's been over 1000 ms since the last event
if (now - kv.Value > TimeSpan.FromMilliseconds(1000))
{
// notify all our listeners
var cds = new WatcherStructs.COPYDATASTRUCT {
cbData = 0, lpData = IntPtr.Zero
};
foreach (var x in _listeners)
{
cds.dwData = (IntPtr)x.token;
int res = SendMessage(x.hwnd, WatcherStructs.WM_COPYDATA, (int)_form.Handle, ref cds);
}
toRemove.Add(kv.Key);
}
}
// remove the tracking on all the files that have been processed
toRemove.ForEach(x => _lastSeen.Remove(x));
if (_lastSeen.Count == 0)
{
_timer.Stop();
}
};
_timer.Start();
}
if (!_timer.Enabled)
{
_timer.Start();
}
});
}
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, ref WatcherStructs.COPYDATASTRUCT lParam);
