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from ctypes import cdll
from epics.ca import find_libca
dllname = find_libca()
print(dllname)
libca = cdll.LoadLibrary(dllname)
print("{:20s} {:s} {:s}".format('function name', 'in libca' , 'in None'))
for fname in ('ca_context_create', 'ca_pend_io',
'ca_create_channel'):
print("{:20s} {:s} {:s}".format(fname,
repr(hasattr(libca, fname)),
repr(hasattr(cdll.LoadLibrary(None), fname))))
#
# False
# >>> libca.ca_context_create
# <_FuncPtr object at 0x109536c00>
# >>> hasattr(cdll.LoadLibrary(None), 'sqrt')
# True
# >>> libc = cdll.LoadLibrary('libc')
# Traceback (most recent call last):
# File "<stdin>", line 1, in <module>
# File "/Users/Newville/anaconda3/lib/python3.7/ctypes/__init__.py", line 434, in LoadLibrary
# return self._dlltype(name)
# File "/Users/Newville/anaconda3/lib/python3.7/ctypes/__init__.py", line 356, in __init__
# self._handle = _dlopen(self._name, mode)
# OSError: dlopen(libc, 6): image not found
# >>> libc = cdll.LoadLibrary('libc.dylib')
# >>> hasattr(cdll.LoadLibrary(None), 'sqrt')
# True
# >>> libca.ca_context_create
# <_FuncPtr object at 0x109536c00>
# >>> hasattr(cdll.LoadLibrary(None), 'ca_context_create')
# False
# >>> hasattr(cdll.LoadLibrary(None), 'ca_pend_io')
# False
# >>> hasattr(cdll.LoadLibrary(None), 'ca_pend_event')
# False
# >>> libca.ca_pend_event
# <_FuncPtr object at 0x109536e58>
# >>>
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