twain.exceptions.SequenceError

[Zhao-fangxu]

import twain
Twain_name1 = "OLYMPUS DP2-TWAIN"
sm = twain.SourceManager(0)
ss = sm.open_source(product_name=Twain_name1)
ss.request_acquire(True, False)
rv = ss.xfer_image_natively()
if rv:
    (handle, count) = rv
    twain.dib_to_bm_file(handle, 'image.bmp')

    Traceback (most recent call last):
  File "D:\proc\twain_proc\test1.py", line 8, in <module>
    rv = ss.xfer_image_natively()
  File "C:\Users\19046\.conda\envs\twain1\lib\site-packages\twain\__init__.py", line 826, in xfer_image_natively
    handle = self._get_native_image()
  File "C:\Users\19046\.conda\envs\twain1\lib\site-packages\twain\__init__.py", line 718, in _get_native_image
    rv = self._call(
  File "C:\Users\19046\.conda\envs\twain1\lib\site-packages\twain\__init__.py", line 239, in _call
    return self._sm._call(self._id, dg, dat, msg, buf, expected_returns)
  File "C:\Users\19046\.conda\envs\twain1\lib\site-packages\twain\__init__.py", line 1333, in _call
    raise exc
twain.exceptions.SequenceError

After calling the scanner, executing ss.xfer_image_natively() will result in an error. May I ask if there is any solution?

[OsamaM0]

Same error here any solutions?

[denisenkom]

Please enable debug logging and upload logs here.
To enable debug logs add following code:

import logging
logging.basicConfig(level=logging.DEBUG)

Also try testing your scanner drivers with Twacker: https://github.com/twain/twain-toolkit/releases and reply back whether it works or not.

[OsamaM0]

I have identified a solution related to my query and noticed that the code in the md file of the pytwain repository (https://github.com/denisenkom/pytwain) produces an error. However, I found that the code samples provided in the demo directory (accessible [here] work excellently with Twain.

Thank you for your efforts in maintaining such an outstanding library!