win32_file_watcher.py 文件源码

def start(self):
    """Start watching the directory for changes."""
    self._directory_handle = ctypes.windll.kernel32.CreateFileW(
        ctypes.c_wchar_p(self._directory),
        ctypes.c_ulong(_FILE_LIST_DIRECTORY),
        ctypes.c_ulong(_FILE_SHARE_READ |
                       _FILE_SHARE_WRITE),
        None,
        ctypes.c_ulong(_OPEN_EXISTING),
        # required to monitor changes.
        ctypes.c_ulong(_FILE_FLAG_BACKUP_SEMANTICS),
        None)
    if self._directory_handle == _INVALID_HANDLE_VALUE:
      raise ctypes.WinError()
    self._thread = threading.Thread(
        target=self._monitor, name='Win32 File Watcher')
    self._thread.start()