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.
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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.
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Please give your guide to fix this issue.