Recent changes to patches

ctypeslib: Add codegenerator support for volatile types

Michael D Hall — Fri, 09 Apr 2010 22:21:57 -0000

When the volatile keyword is used in C code, gccxml uses the type CvQualifiedType. This patch will allow the codegenerator to follow the type field to the true type that is being qualified by the volatile keyword. This change does not cause the generated python code to treat this variable any different but I doubt that such a distention makes any sense.

for code generator to enable #define'd double constants

guyster — Sat, 18 Oct 2008 22:32:21 -0000

The code generator doesn't handle any #defined constants with doubles. The patch contains a fix for the generator as well as coverage for the unit tests.

The patch is applied against the ctypeslib-gccxml-0.9 branch, but might similarly work also against trunk.

import ctypes fails on OS X

Scott F. Johnston — Fri, 02 Mar 2007 10:09:44 -0000

Trying to get ctypes to work on a stock MacBook Pro. (Python 2.3)

easy_install fails due to dead links to starship.python.net.
Version 1.0.1 from sourceforge builds and installs, but does not import:

if gestalt.gestalt("sysv") < 0x1040:
MacOS.Error: (-5551, 'undefined selector was passed to Gestalt')

That's not a very friendly response.

As I'm running 10.4.8, I've just commented out those lines.
However, this should be corrected in ctypes.

--S

ctypeslib: loading libraries to resolve missing references

Michal J. Gajda — Wed, 28 Feb 2007 11:47:24 -0000

The patch below adds the --preload option to resolve missing references from DLLs.

ctypeslib handling simple variables

Michal J. Gajda — Wed, 28 Feb 2007 11:44:55 -0000

xml2py.py doesn't seem to generate code for uninitialized variables. Since
it may be crucial for library interface (see errno.h), I attach the crude
patch that does that.

doc fixes

Tim Mitchell — Mon, 15 Jan 2007 21:45:14 -0000

Mostly changes in tutorials - mainly grammer and prose.
Also fixed a mistake in the reference manual for the in_dll method - args were reversed.

Python API declarations

Lenard Lindstrom — Thu, 21 Dec 2006 04:28:22 -0000

The is a python module, pythonhdr.py, which declares several, hopefully useful, Python C API declarations and functions. Also includes is a unit test.

Handle borrowed and stolen references

Lenard Lindstrom — Fri, 24 Nov 2006 21:33:49 -0000

This patch creates a new C type, py_object_incref, for use as a return type for pythonapi functions that borrow a reference and as an argument for functions that steal a reference. py_object_incref cannot be instantiated or used as a structure field. As side benefits a CDataType subclass now accepts an optional _flags_ attribute to set selected stgdict flag fields and a new flag is defined to prevent a C type from being a structure field.

The patch is applied to ctypes 1.0.1 release. It alters files _ctypes.c, ctypes.h, cfield.c, stgdict.c,__init__.py . The patch includes a new unit test test_py_object_incref.py . The following invocation of GNU patch 2.5 from the directory containing ctypes-1.0.1 seems to work:

patch -p0 <py_object_incref.diff

The patch has only been tested with MSVC 6 and Python 2.3. The following Python session is a usage example.

Python 2.3.5 (#62, Feb 8 2005, 16:23:02) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes import *
>>> py_object_incref._type_
'o'
>>> py_object_incref._flags_
256
>>> # Borrowed reference
...
>>> PyList_GetItem = pythonapi.PyList_GetItem
>>> PyList_GetItem.restype = py_object_incref
>>> PyList_GetItem.argtypes = [py_object, c_int]
>>> PyList_GetItem([1, 2, 3], 1)
2
>>> # Stolen reference
...
>>> PyList_SetItem = pythonapi.PyList_SetItem
>>> PyList_SetItem.argtypes = [py_object, c_int, py_object_incref]
>>> x = [1, 2, 3]
>>> PyList_SetItem(x, 2, 5)
0
>>> x
[1, 2, 5]
>>> # py_object_incref instances and fields not allowed
...
>>> py_object_incref(None)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "C:\prg\ctypes-1.0.1\ctypes\__init__.py", line 148, in __new__
_type_ = "H"
NotImplementedError: py_object_incref for argument and return types only.
>>> class S(Structure):
... _fields_ = ('o', py_object_incref),
...
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: field 0 must be an allowed C type: got py_object_incref instead

missing imports in documentation examples

Daniele Varrazzo — Wed, 13 Sep 2006 12:32:36 -0000

The attached patch fixes a couple of missing imports in
documentation examples. Original is from r51868.

byref_at for returning references to array elements

Shane Holloway — Mon, 14 Aug 2006 01:01:20 -0000

Implements a simple way to return references to array elements. Allows
the following C code::

// from the OpenGL Programming Guide (Red Book), Fifth Edition, pp
455
glTexGenfv(GL_T, GL_OBJECT_PLANE, &tmpMatrix[4]);

To be written in ctypes like::

glTexGenfv(GL_T, GL_OBJECT_PLANE, byref_at(tmpMatrix, 4))

Instead of::

p = cast(tmpMatrix, c_void_p)
p.value += sizeof(tmpMatrix._type_) * 4
glTexGenfv(GL_T, GL_OBJECT_PLANE, cast(p, c_float_p))