转换Python对象到C void类型 [英] Convert Python object to C void type

问题描述

如何使用用Cython转换Python对象到C void类型？

How can I convert Python object to C void type using Cython?

目前，当我尝试投我得到这个消息

Currently I am getting this message when I try to cast

铸造临时Python对象以非数字非Python类型

Casting temporary Python object to non-numeric non-Python type

推荐答案

这可以这样做：

1。从Python的铸造到C

如果你真正的意思无效* 这将是：

If you really meant void * this would be :

some_pyobj = "abc"
cdef void *ptr
ptr = <void *>some_pyobj

如果你的意思是的PyObject * 这将是：

If you meant PyObject * this would be :

cdef PyObject *ptr
ptr = <PyObject *>some_pyobj           # Cast from Python object to C pointer

然后，从C端，的PyObject结构可通过包括 Python.h 。

下面是引用（从 object.h Python的包含文件）：

Here is the reference (from object.h Python include file) :

/* Nothing is actually declared to be a PyObject, but every pointer to
 * a Python object can be cast to a PyObject*.  This is inheritance built
 * by hand.  Similarly every pointer to a variable-size Python object can,
 * in addition, be cast to PyVarObject*.
 */
typedef struct _object {
    PyObject_HEAD
} PyObject;

2。从C铸造到Python

它工作在两种方式，这意味着以下也是可能的：

It works in both ways, meaning that the following is also possible :

cdef PyObject *ptr
ptr = <PyObject *>some_pyobj
cdef object some_other_pyobj
some_other_pyobj = <object>ptr          # Cast from C pointer to Python object

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