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# Copyright 2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
try:
import ctypes
import ctypes.util
except ImportError:
ctypes = None
else:
try:
ctypes.cdll
except AttributeError:
ctypes = None
_library_names = {}
def find_library(name):
"""
Calls ctype.util.find_library() if the ctypes module is available,
and otherwise returns None. Results are cached for future invocations.
"""
filename = _library_names.get(name)
if filename is None:
if ctypes is not None:
filename = ctypes.util.find_library(name)
if filename is None:
filename = False
_library_names[name] = filename
if filename is False:
return None
return filename
def LoadLibrary(name):
"""
Calls ctypes.cdll.LoadLibrary(name) if the ctypes module is available,
and otherwise returns None. Results are not cached, since that can
cause problems when libraries are updated (see bug #448858).
"""
handle = None
if ctypes is not None:
handle = ctypes.cdll.LoadLibrary(name)
return handle
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