On Mon, Feb 15, 2021 at 7:35 PM Mansour Moufid <[email protected]> wrote:
>
> On Tue, Jan 26, 2021 at 3:50 AM Friedrich Romstedt
> <[email protected]> wrote:
> >
> > Hi,
> >
> > This is with Python 3.8.2 64-bit and numpy 1.19.2 on Windows 10. I'd
> > like to be able to convert some C++ extension type to a numpy array by
> > using ``numpy.asarray``. The extension type implements the Python
> > buffer interface to support this.
> >
> > The extension type, called "Image" here, holds some chunk of
> > ``double``, C order, contiguous, 2 dimensions. It "owns" the buffer;
> > the buffer is not shared with other objects. The following Python
> > code crashes::
> >
> > image = <... Image production ...>
> > ar = numpy.asarray(image)
> >
> > However, when I say::
> >
> > image = <... Image production ...>
> > print("---")
> > ar = numpy.asarray(image)
> >
> > the entire program is executing properly with correct data in the
> > numpy ndarray produced using the buffer interface.
>
> Maybe a dereference bug.
>
> Try setting pointers to NULL after freeing, something like this:
>
> delete[] view->shape;
> view->shape = NULL;
> delete[] view->strides;
> view->strides = NULL;
>
> ...
>
> delete[] self->data;
> self->data = NULL;
Sorry for two messages in a row, I just noticed:
I don't see the type's tp_free member defined?
You can set it to PyObject_Free in Init_ImageType:
ImageType.tp_free = PyObject_Free;
See here: https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_free
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