问题描述
有时，我需要调用仅存在于C中的gtk / gobject函数，但返回一个具有python包装器的对象。以前，我使用了基于效果良好的ctypes的解决方案：
Sometimes I need to call a gtk/gobject function that only exists in C, but returns an object that has a python wrapper. Previously I used a solution based on ctypes that worked well:
现在我从PyGtk（导入gtk）夹到GObject-introspection（从gi.repository导入Gtk），该怎么用呢？
Now that I swiched from PyGtk ("import gtk") to GObject-introspection ("from gi.repository import Gtk"), what can I use instead?
推荐答案
_PyGObject_API 接口在某些时候已更改。我需要删除 register_sinkfunc 函数。以下工作：
The _PyGObject_API interface has changed at some point. I needed to drop the register_sinkfunc function. The following works:
from gi.repository import Gio, GLib
import gi
import ctypes
class _PyGObject_Functions(ctypes.Structure):
_fields_ = [
('register_class',
ctypes.PYFUNCTYPE(ctypes.c_void_p, ctypes.c_char_p,
ctypes.c_int, ctypes.py_object,
ctypes.py_object)),
('register_wrapper',
ctypes.PYFUNCTYPE(ctypes.c_void_p, ctypes.py_object)),
('lookup_class',
ctypes.PYFUNCTYPE(ctypes.py_object, ctypes.c_int)),
('newgobj',
ctypes.PYFUNCTYPE(ctypes.py_object, ctypes.c_void_p)),
]
class PyGObjectCPAI(object):
def __init__(self):
PyCObject_AsVoidPtr = ctypes.pythonapi.PyCObject_AsVoidPtr
PyCObject_AsVoidPtr.restype = ctypes.c_void_p
PyCObject_AsVoidPtr.argtypes = [ctypes.py_object]
addr = PyCObject_AsVoidPtr(ctypes.py_object(
gi._gobject._PyGObject_API))
self._api = _PyGObject_Functions.from_address(addr)
def pygobject_new(self, addr):
return self._api.newgobj(addr)
capi = PyGObjectCPAI()
要从指针获取对象：
obj = capi.pygobject_new(pointer)
从（g）对象获取指针：
to get a pointer from a (g)object:
pointer = hash(obj)
我必须添加并没有帮助我解决实际问题。我试图与dconf进行接口连接，但是dconf返回的类型为GVariant，它不继承自GObject。不幸的是，似乎PyGI / GObject没有公开将C（* GVariant）转换为Python GLib.Variant所需的函数。我猜是那些时候您不得不放弃最初的方法并尝试一些不同的事情。
I have to add, in my case this didn't help me solve my actual problem. I was trying to interface with dconf, but dconf returns values of type GVariant, which does not inherit from GObject. It seems PyGI/GObject unfortunately does not expose the neccessary functions to turn a C (*GVariant) into a Python GLib.Variant. I guess it's of those times when you have to throw away your initial approach and try something different.
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