8000 Copy .NET to numpy array: python 3 breaks constructor IntPtr.__overloads__[int](np_arr.__array_interface__['data'][0]) · Issue #1116 · pythonnet/pythonnet · GitHub
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Copy .NET to numpy array: python 3 breaks constructor IntPtr.__overloads__[int](np_arr.__array_interface__['data'][0]) #1116

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greg814 opened this issue Apr 16, 2020 · 7 comments
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Copy .NET to numpy array: python 3 breaks constructor IntPtr.__overloads__[int](np_arr.__array_interface__['data'][0]) #1116

greg814 opened this issue Apr 16, 2020 · 7 comments
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3.0.0

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@greg814
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greg814 commented Apr 16, 2020

Environment

Pythonnet version: 2.4.0 (in both python versions)

Python version:

  • 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

  • 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

  • Operating System: Windows 10 Professional 64-bit

Details

Trying to copy a .NET array to a numpy array using Marshal as in the example on the mailing list:

import clr
from System import Array, Double, IntPtr, Random
from System.Runtime.InteropServices import Marshal
import numpy as np

r = Random()
src = Array.CreateInstance(Double, 10000000)
for i in xrange(len(src)): src[i] = r.NextDouble()

from System.Runtime.InteropServices import Marshal
dest = np.empty(len(src))
dest_ptr = IntPtr.__overloads__[int](dest.__array_interface__['data'][0])
Marshal.Copy(src, 0, dest_ptr, len(src))

was working fine in python 2 but in 3 results in

Traceback (most recent call last):
  File "test.py", line 12, in <module>
    dest_ptr = IntPtr.__overloads__[int](dest.__array_interface__['data'][0])
TypeError: no constructor matches given arguments

TODO
How can the changed python 3 int be used in this constructor?
lostmsu added a commit to losttech/pythonnet that referenced this issue May 14, 2020
@lostmsu
Improve "No constructor matches given arguments" message with more de…
72e6bf7 
…tails

Similar to pythonnet#900, but for constructors (reuses the same code)

Related issues: pythonnet#811, pythonnet#265, pythonnet#1116
@lostmsu lostmsu mentioned this issue May 14, 2020
Merged
filmor pushed a commit that referenced this issue May 14, 2020
@lostmsu
Improve "No constructor matches given arguments" message with more de…
6d2f0bd 
…tails (#1143)

Similar to #900, but for constructors (reuses the same code)

Related issues: #811, #265, #1116
AlexCatarino pushed a commit to QuantConnect/pythonnet that referenced this issue Jun 29, 2020
@lostmsu @AlexCatarino
Improve "No constructor matches given arguments" message with more de…
d5e164a 
…tails (pythonnet#1143)

Similar to pythonnet#900, but for constructors (reuses the same code)

Related issues: pythonnet#811, pythonnet#265, pythonnet#1116
@filmor filmor added this to the 3.0.0 milestone Jul 8, 2022
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filmor commented Jul 8, 2022

@lostmsu I'll investigate this, there seems to be no way to initialise a System.IntPtr from Python.NET right now.

@filmor filmor mentioned this issue Jul 8, 2022
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@greg814
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greg814 commented Jul 8, 2022

Did you see this parsing workaround on stackoverflow? Funny you would comment here 2 hrs after the so post...

@filmor filmor mentioned this issue Jul 8, 2022
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filmor commented Jul 8, 2022

It's related, @jhe-pf commented on gitter and I started to look into it :)

I have identified the problem, I just need to find a fix.

@lostmsu
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lostmsu commented Jul 8, 2022

@filmor as mentioned on StackOverflow, __overloads__[Int64] should work. The overloads fail with int because int is not a .NET type.

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filmor commented Jul 8, 2022

No, check the linked PR. The issue is that primitive types are initialised differently, which in our case is implemented as a conversion, but not for the ptr types.

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lostmsu commented Jul 11, 2022 •
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I have pythonnet==3.0.0a2 and in it IntPtr.__overloads__[Int64](42).ToInt64() prints 42.

EDIT. Ah, just updated to rc2 and there I indeed get "TypeError: No match found for given type params"

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filmor commented Aug 12, 2022

Fixed in #1861.

@filmor filmor closed this as completed Aug 12, 2022
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