[issue32881] pycapsule:PyObject * is NULL pointer

[Irit Katriel]

Irit Katriel  added the comment:

Python 2.7 is no longer maintained. If you are seeing this problem on a new 
version (>= 3.9), please create a new issue with full instructions how to 
reproduce it.

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nosy: +iritkatriel
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue32881] pycapsule:PyObject * is NULL pointer

[zhaoya]

zhaoya  added the comment:

FUNCTION_CALL_MODE is __stdcall i think no problem.because, if 
GetContext(PyObject  *capsule) -->GetContext() is ok. PyObject  *capsule from 
python to c unknown error occurred.

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[issue32881] pycapsule:PyObject * is NULL pointer

[Steve Dower]

Steve Dower  added the comment:

What is the definition of FUNCTION_CALL_MODE? And if it is anything other than 
"stdcall", change "ctypes.windll" to "ctypes.cdll" and try again.

You should also consider posting this to python-list, as it is almost certainly 
a problem in your DLL and not in Python itself.

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[issue32881] pycapsule:PyObject * is NULL pointer

[zhaoya]

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
pycapsule.hello()
pycapsule.GetContext(lpContext)
.
the lpContest is ""
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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