/// <summary>
/// Internally creates and starts the monitor thread.
/// </summary>
/// <returns>
/// True if the thread was successfully created.
/// To ensure the monitor was successfully activated, handle the MonitorOpened event.
/// </returns>
/// <remarks></remarks>
protected bool internalWatch()
{
int blen = 0;
int bufflen = (int)_Buff.Size;
var tbuff = _Buff.Handle;
if (_thread is object)
{
return(false);
}
if (!internalOpenFile())
{
return(false);
}
FILE_NOTIFY_INFORMATION fn;
fn.ptr = _Buff;
_thread = new System.Threading.Thread(() =>
{
var notice = IntPtr.Zero;
User32.PostMessage(Handle, FileSystemMonitor.WM_SIGNAL_OPEN, IntPtr.Zero, IntPtr.Zero);
do
{
try
{
// let's clean up the memory before the next execute.
if (blen > 0)
{
_Buff.ZeroMemory(0L, blen);
blen = 0;
}
if (!FileSystemMonitor.ReadDirectoryChangesW(_hFile, tbuff, bufflen, true, _Filter, ref blen, IntPtr.Zero, IntPtr.Zero))
{
notice = (IntPtr)User32.GetLastError();
break;
}
}
catch (System.Threading.ThreadAbortException)
{
break;
}
catch (Exception)
{
notice = (IntPtr)1;
break;
}
// block until the lock is acquired. Hopefully the
// UI thread will not take that long to clean the list.
System.Threading.Monitor.Enter(_WaitList);
_WaitList.Add(FSMonitorEventArgs.FromPtr(fn, this));
// and we're done ...
System.Threading.Monitor.Exit(_WaitList);
// post to the UI thread that there are items to dequeue and continue!
User32.PostMessage(Handle, FileSystemMonitor.WM_SIGNAL, IntPtr.Zero, IntPtr.Zero);
}while (true);
_thread = null;
User32.PostMessage(Handle, FileSystemMonitor.WM_SIGNAL_CLOSE, IntPtr.Zero, IntPtr.Zero);
});
_thread.SetApartmentState(System.Threading.ApartmentState.STA);
_thread.IsBackground = true;
_thread.Start();
return(true);
}
