将Python对象转换为C void类型

Question

如何使用Cython将Python对象转换为C void类型？

目前我在尝试演员时收到此消息

将临时Python对象转换为非数字非Python类型

Answer 1

这可以这样做:

1.从Python转换为C

如果你真的意味着void *这将是:

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

如果你的意思PyObject *是:

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

然后,从C侧,PyObject struct可以通过包括Python.h.

这是参考(来自object.hPython包含文件):

/* 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转换为Python

它以两种方式工作,这意味着以下也是可能的:

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

Answer 2

你可以：

def run():
   pyobj = 'abc'
   pyobj_void_star = <void *>pyobj