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.. highlightlang:: c
.. _cobjects:
CObjects
--------
.. index:: object: CObject
Refer to :ref:`using-cobjects` for more information on using these objects.
.. ctype:: PyCObject
This subtype of :ctype:`PyObject` represents an opaque value, useful for C
extension modules who need to pass an opaque value (as a :ctype:`void\*`
pointer) through Python code to other C code. It is often used to make a C
function pointer defined in one module available to other modules, so the
regular import mechanism can be used to access C APIs defined in dynamically
loaded modules.
.. cfunction:: int PyCObject_Check(PyObject *p)
Return true if its argument is a :ctype:`PyCObject`.
.. cfunction:: PyObject* PyCObject_FromVoidPtr(void* cobj, void (*destr)(void *))
Create a :ctype:`PyCObject` from the ``void *`` *cobj*. The *destr* function
will be called when the object is reclaimed, unless it is *NULL*.
.. cfunction:: PyObject* PyCObject_FromVoidPtrAndDesc(void* cobj, void* desc, void (*destr)(void *, void *))
Create a :ctype:`PyCObject` from the :ctype:`void \*` *cobj*. The *destr*
function will be called when the object is reclaimed. The *desc* argument can
be used to pass extra callback data for the destructor function.
.. cfunction:: void* PyCObject_AsVoidPtr(PyObject* self)
Return the object :ctype:`void \*` that the :ctype:`PyCObject` *self* was
created with.
.. cfunction:: void* PyCObject_GetDesc(PyObject* self)
Return the description :ctype:`void \*` that the :ctype:`PyCObject` *self* was
created with.
.. cfunction:: int PyCObject_SetVoidPtr(PyObject* self, void* cobj)
Set the void pointer inside *self* to *cobj*. The :ctype:`PyCObject` must not
have an associated destructor. Return true on success, false on failure.
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