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Edit File : utils.py \| Size : 2.42 KB
# -- coding: utf-8 -- # Copyright (C) 2013 Sebastian Wiesner <lunaryorn@gmail.com> # This library is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by the # Free Software Foundation; either version 2.1 of the License, or (at your # option) any later version. # This library is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License # for more details. # You should have received a copy of the GNU Lesser General Public License # along with this library; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ pyudev._ctypeslib.utils ======================= Utilities for loading ctypeslib. .. moduleauthor:: Anne Mulhern <amulhern@redhat.com> """ from __future__ import absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals from ctypes import CDLL from ctypes.util import find_library def load_ctypes_library(name, signatures, error_checkers): """ Load library ``name`` and return a :class:`ctypes.CDLL` object for it. :param str name: the library name :param signatures: signatures of methods :type signatures: dict of str * (tuple of (list of type) * type) :param error_checkers: error checkers for methods :type error_checkers: dict of str * ((int * ptr * arglist) -> int) The library has errno handling enabled. Important functions are given proper signatures and return types to support type checking and argument conversion. :returns: a loaded library :rtype: ctypes.CDLL :raises ImportError: if the library is not found """ library_name = find_library(name) if not library_name: raise ImportError('No library named %s' % name) lib = CDLL(library_name, use_errno=True) # Add function signatures for funcname, signature in signatures.items(): function = getattr(lib, funcname, None) if function: argtypes, restype = signature function.argtypes = argtypes function.restype = restype errorchecker = error_checkers.get(funcname) if errorchecker: function.errcheck = errorchecker return lib Back

Edit File : utils.py | Size : 2.42 KB

# -*- coding: utf-8 -*-
# Copyright (C) 2013 Sebastian Wiesner <lunaryorn@gmail.com>

# This library is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation; either version 2.1 of the License, or (at your
# option) any later version.

# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
# for more details.

# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

"""
    pyudev._ctypeslib.utils
    =======================

Utilities for loading ctypeslib.

.. moduleauthor::  Anne Mulhern  <amulhern@redhat.com>
"""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

from ctypes import CDLL
from ctypes.util import find_library

def load_ctypes_library(name, signatures, error_checkers):
    """
    Load library ``name`` and return a :class:`ctypes.CDLL` object for it.

:param str name: the library name
    :param signatures: signatures of methods
    :type signatures: dict of str * (tuple of (list of type) * type)
    :param error_checkers: error checkers for methods
    :type error_checkers: dict of str * ((int * ptr * arglist) -> int)

The library has errno handling enabled.
    Important functions are given proper signatures and return types to support
    type checking and argument conversion.

:returns: a loaded library
    :rtype: ctypes.CDLL
    :raises ImportError: if the library is not found
    """
    library_name = find_library(name)
    if not library_name:
        raise ImportError('No library named %s' % name)
    lib = CDLL(library_name, use_errno=True)
    # Add function signatures
    for funcname, signature in signatures.items():
        function = getattr(lib, funcname, None)
        if function:
            argtypes, restype = signature
            function.argtypes = argtypes
            function.restype = restype
            errorchecker = error_checkers.get(funcname)
            if errorchecker:
                function.errcheck = errorchecker
    return lib

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