def __init__(self, scanner):
self.__scanner = scanner
self.__is_scanning = True
self.__raw_output = []
self.__img = None
self.__scanner._open()
rawapi.sane_start(sane_dev_handle[1])
try:
self.__parameters = \
rawapi.sane_get_parameters(sane_dev_handle[1])
except Exception:
rawapi.sane_cancel(sane_dev_handle[1])
raise
def read(self):
try:
if not self.__is_scanning:
rawapi.sane_start(sane_dev_handle[1])
self.__is_scanning = True
self.__must_clean = True
self.__parameters = \
rawapi.sane_get_parameters(sane_dev_handle[1])
return
try:
self.__raw_output.append(rawapi.sane_read(sane_dev_handle[1],
SANE_READ_BUFSIZE))
except EOFError:
raw = b''.join(self.__raw_output)
self.__imgs.append(ImgUtil.raw_to_img(raw, self.__parameters))
self.__is_scanning = False
self.__raw_output = []
raise
except StopIteration:
rawapi.sane_cancel(sane_dev_handle[1])
self.__must_clean = False
self.__is_scanning = False
raise
