New submission from zhaoya <>:

i have question:call,c-->python-->c. 
1.the c pointer void* abc="123" by pycapsule in the c code.
void* lpContext = "abc";
PyObject * lpPyContext = PyCapsule_New(lpContext, "Context",NULL);
PyTuple_SetItem(pArgs, 1, lpPyContext);
PyObject* pyResult = PyObject_CallObject(pFunc, pArgs);

2.c call python:

in the python code:
import ctypes
pycapsule = ctypes.windll.LoadLibrary("C:\Users\zhaoya16975\Documents\Visual 
Studio 2017\Projects\cpython\Release\pycapsule.dll")
def test( lpContext,lpRequest,lpAnswer):
    print lpContext
the lpContest is "<capsule object "Context" at 0x02747e00>"
but,i can't lpContext in the pycapsule.GetContest:
the capsule is null poniter,the GetContext no execute!!

void* FUNCTION_CALL_MODE GetContext(PyObject  *capsule) {
                printf(" GetContext......\n");
                //if (!PyCapsule_IsValid((PyObject *)capsule, "Context")) {
                //      printf(" the Capsule Context is no Valid\n");
                //      return NULL;
                //return PyCapsule_GetPointer((PyObject *)capsule, "Context");
                return NULL;

i hope c call python  pass void* ,and python call c pass void* ,but the capsule 
call no success.

components: Windows
messages: 312399
nosy: paul.moore, steve.dower, tim.golden, zach.ware, zhaoya
priority: normal
severity: normal
status: open
title: pycapsule:PyObject * is NULL pointer
type: crash
versions: Python 2.7

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