On Mon, Feb 15, 2021 at 7:35 PM Mansour Moufid <mansourmoufid@gmail.com> wrote:
On Tue, Jan 26, 2021 at 3:50 AM Friedrich Romstedt <friedrichromstedt@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;
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