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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Copy .NET to numpy array: python 3 breaks constructor IntPtr.__overloads__[int](np_arr.__array_interface__['data'][0])","articleBody":"### Environment\r\n\r\nPythonnet version: 2.4.0 (in both python versions)\r\n\r\nPython version:\r\n- code working in Python 2.7.17 (v2.7.17:c2f86d86e6, Oct 19 2019, 21:01:17) [MSC v.1500 64 bit (AMD64)] on win32\r\n- code not working in Python 3.7.7 (tags/v3.7.7:d7c567b08f, Mar 10 2020, 10:41:24) [MSC v.1900 64 bit (AMD64)] on win32\r\n\r\n-   Operating System: Windows 10 Professional 64-bit\r\n\r\n### Details\r\n\r\nTrying to copy a .NET array to a numpy array using Marshal as in the example on the [mailing list](https://mail.python.org/pipermail/pythondotnet/2014-May/001525.html):\r\n\r\n```\r\nimport clr\r\nfrom System import Array, Double, IntPtr, Random\r\nfrom System.Runtime.InteropServices import Marshal\r\nimport numpy as np\r\n\r\nr = Random()\r\nsrc = Array.CreateInstance(Double, 10000000)\r\nfor i in xrange(len(src)): src[i] = r.NextDouble()\r\n\r\nfrom System.Runtime.InteropServices import Marshal\r\ndest = np.empty(len(src))\r\ndest_ptr = IntPtr.__overloads__[int](dest.__array_interface__['data'][0])\r\nMarshal.Copy(src, 0, dest_ptr, len(src))\r\n```\r\n\r\nwas working fine in python 2 but in 3 results in\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"test.py\", line 12, in \u003cmodule\u003e\r\n    dest_ptr = IntPtr.__overloads__[int](dest.__array_interface__['data'][0])\r\nTypeError: no constructor matches given arguments\r\n```\r\n\r\nTODO\r\nHow can the changed [python 3 int](https://docs.python.org/3.0/whatsnew/3.0.html#integers) be used in this constructor?\r\n","author":{"url":"https://github.com/greg814","@type":"Person","name":"greg814"},"datePublished":"2020-04-16T18:06:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/1116/pythonnet/issues/1116"}