On Tue, Jan 26, 2021 at 3:50 AM Friedrich Romstedt
<friedrichromst...@gmail.com> 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;
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