CDLL : Can't find module

[twinkim2]

BPO	32738
Nosy	@tiran

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-02-01.13:21:09.638>
created_at = <Date 2018-02-01.01:58:06.110>
labels = ['ctypes', 'type-bug', 'invalid']
title = "CDLL : Can't find module"
updated_at = <Date 2018-02-01.13:21:09.628>
user = 'https://bugs.python.org/twinkim2'

bugs.python.org fields:

activity = <Date 2018-02-01.13:21:09.628>
actor = 'christian.heimes'
assignee = 'none'
closed = True
closed_date = <Date 2018-02-01.13:21:09.638>
closer = 'christian.heimes'
components = ['ctypes']
creation = <Date 2018-02-01.01:58:06.110>
creator = 'twinkim2'
dependencies = []
files = []
hgrepos = []
issue_num = 32738
keywords = []
message_count = 2.0
messages = ['311398', '311426']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'twinkim2']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32738'
versions = ['Python 3.6']

[twinkim2]

I just try to import ./so created by c language.
However , if some c function library is added in c souce code such as "fopen" and "sscanf" related with stdio , runtime error is happend like as below.
==================================================================

Traceback (most recent call last):  File "D:\python_test\c_library_test.py", line 8, in <module>
    adder = CDLL('./_adder.so')
  File "C:\Users\admin\AppData\Local\Programs\Python\Python36\lib\ctypes\__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] can't fine Module.

===================================================================
Please give your guide to fix this issue.

[tiran]

Your library is probably missing dependencies.

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