Asynchronously closes the file enumerator.
If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned in FileEnumerator.closeFinish.
the [I/O priority][io-priority] of the request
optional gio.Cancellable object, NULL to ignore.
a GAsyncReadyCallback to call when the request is satisfied
the data to pass to callback function
Asynchronously closes the file enumerator.
If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned in FileEnumerator.closeFinish.