Python _ctypes.CFuncPtr() Examples

The following are 30 code examples of _ctypes.CFuncPtr(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module _ctypes , or try the search function .
Example #1
Source File: __init__.py    From Imogen with MIT License 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR
        if _sys.platform.startswith("aix"):
            """When the name contains ".a(" and ends with ")",
               e.g., "libFOO.a(libFOO.so)" - this is taken to be an
               archive(member) syntax for dlopen(), and the mode is adjusted.
               Otherwise, name is presented to dlopen() as a file argument.
            """
            if name and name.endswith(")") and ".a(" in name:
                mode |= ( _os.RTLD_MEMBER | _os.RTLD_NOW )

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #2
Source File: __init__.py    From BinderFilter with MIT License 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #3
Source File: __init__.py    From PyDev.Debugger with Eclipse Public License 1.0 6 votes vote down vote up 
def CFUNCTYPE(restype, *argtypes):
    """CFUNCTYPE(restype, *argtypes) -> function prototype.

    restype: the result type
    argtypes: a sequence specifying the argument types

    The function prototype can be called in three ways to create a
    callable object:

    prototype(integer address) -> foreign function
    prototype(callable) -> create and return a C callable function from callable
    prototype(integer index, method name[, paramflags]) -> foreign function calling a COM method
    prototype((ordinal number, dll object)[, paramflags]) -> foreign function exported by ordinal
    prototype((function name, dll object)[, paramflags]) -> foreign function exported by name
    """
    try:
        return _c_functype_cache[(restype, argtypes)]
    except KeyError:
        class CFunctionType(_CFuncPtr):
            _argtypes_ = argtypes
            _restype_ = restype
            _flags_ = _FUNCFLAG_CDECL
        _c_functype_cache[(restype, argtypes)] = CFunctionType
        return CFunctionType
Example #4
Source File: __init__.py    From canape with GNU General Public License v3.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #5
Source File: __init__.py    From BinderFilter with MIT License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #6
Source File: __init__.py    From ironpython2 with Apache License 2.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #7
Source File: __init__.py    From canape with GNU General Public License v3.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #8
Source File: __init__.py    From Computable with MIT License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #9
Source File: __init__.py    From Computable with MIT License 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #10
Source File: __init__.py    From ironpython2 with Apache License 2.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #11
Source File: __init__.py    From unity-python with MIT License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #12
Source File: __init__.py    From Fluid-Designer with GNU General Public License v3.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #13
Source File: __init__.py    From Fluid-Designer with GNU General Public License v3.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #14
Source File: __init__.py    From PokemonGo-DesktopMap with MIT License 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #15
Source File: __init__.py    From Imogen with MIT License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #16
Source File: __init__.py    From meddle with MIT License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #17
Source File: __init__.py    From PokemonGo-DesktopMap with MIT License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #18
Source File: __init__.py    From ironpython3 with Apache License 2.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #19
Source File: __init__.py    From ironpython3 with Apache License 2.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #20
Source File: __init__.py    From datafari with Apache License 2.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #21
Source File: __init__.py    From datafari with Apache License 2.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #22
Source File: __init__.py    From Carnets with BSD 3-Clause "New" or "Revised" License 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #23
Source File: __init__.py    From Splunking-Crime with GNU Affero General Public License v3.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #24
Source File: __init__.py    From Splunking-Crime with GNU Affero General Public License v3.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #25
Source File: __init__.py    From RevitBatchProcessor with GNU General Public License v3.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #26
Source File: __init__.py    From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #27
Source File: __init__.py    From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 6 votes vote down vote up 
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
                 use_errno=False,
                 use_last_error=False):
        self._name = name
        flags = self._func_flags_
        if use_errno:
            flags |= _FUNCFLAG_USE_ERRNO
        if use_last_error:
            flags |= _FUNCFLAG_USE_LASTERROR

        class _FuncPtr(_CFuncPtr):
            _flags_ = flags
            _restype_ = self._func_restype_
        self._FuncPtr = _FuncPtr

        if handle is None:
            self._handle = _dlopen(self._name, mode)
        else:
            self._handle = handle
Example #28
Source File: __init__.py    From RevitBatchProcessor with GNU General Public License v3.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #29
Source File: __init__.py    From odoo13-x64 with GNU General Public License v3.0 6 votes vote down vote up 
def WINFUNCTYPE(restype, *argtypes, **kw):
        # docstring set later (very similar to CFUNCTYPE.__doc__)
        flags = _FUNCFLAG_STDCALL
        if kw.pop("use_errno", False):
            flags |= _FUNCFLAG_USE_ERRNO
        if kw.pop("use_last_error", False):
            flags |= _FUNCFLAG_USE_LASTERROR
        if kw:
            raise ValueError("unexpected keyword argument(s) %s" % kw.keys())
        try:
            return _win_functype_cache[(restype, argtypes, flags)]
        except KeyError:
            class WinFunctionType(_CFuncPtr):
                _argtypes_ = argtypes
                _restype_ = restype
                _flags_ = flags
            _win_functype_cache[(restype, argtypes, flags)] = WinFunctionType
            return WinFunctionType
Example #30
Source File: __init__.py    From filmkodi with Apache License 2.0 6 votes vote down vote up 
def CFUNCTYPE(restype, *argtypes):
    """CFUNCTYPE(restype, *argtypes) -> function prototype.

    restype: the result type
    argtypes: a sequence specifying the argument types

    The function prototype can be called in three ways to create a
    callable object:

    prototype(integer address) -> foreign function
    prototype(callable) -> create and return a C callable function from callable
    prototype(integer index, method name[, paramflags]) -> foreign function calling a COM method
    prototype((ordinal number, dll object)[, paramflags]) -> foreign function exported by ordinal
    prototype((function name, dll object)[, paramflags]) -> foreign function exported by name
    """
    try:
        return _c_functype_cache[(restype, argtypes)]
    except KeyError:
        class CFunctionType(_CFuncPtr):
            _argtypes_ = argtypes
            _restype_ = restype
            _flags_ = _FUNCFLAG_CDECL
        _c_functype_cache[(restype, argtypes)] = CFunctionType
        return CFunctionType