Re: [PyInstaller] Win11 Pyinstall ctypes dll OSError: exception: access violation reading 0x0000000000000000

[Chris Barker]

vispy is built on top of OpenGL -- and it looks like your code (that's failing) is doing some pretty darn low-level stuff.

*maybe* the vispy import is causing a different version of some library (that AirAPI also uses).

Not really sure how to debug this, but I'd look at what libs are getting brought in in the built app (dont do it one-file at this point, so you can see everything that there) compare what happens with and without the vispy import.

Good luck!

-CHB

 

On Thu, Aug 8, 2024 at 5:38 AM Yang Chen <cheny2....@gmail.com> wrote:

My Python script works just fine, but something wrong with the exe generated by Pyinstaller.

Error message:
Traceback (most recent call last):
  File "main.py", line 3, in <module>
    print(XReal.get_arr())
  File "XReal.py", line 9, in get_arr
    ptr = self.dll.GetEuler()
OSError: exception: access violation reading 0x0000000000000000

Source code:
XReal.py:
import ctypes
class xreal:
    def __init__(self):
        self.dll = ctypes.CDLL('AirAPI_Windows.dll')
        self.dll.StartConnection()
        self.dll.GetEuler.restype = ctypes.POINTER(ctypes.c_float)
        self.arr = (ctypes.c_float * 3)()
    def get_arr(self):
        ptr = self.dll.GetEuler()
        ctypes.memmove(self.arr, ptr, ctypes.sizeof(self.arr))
        return list(self.arr)
XReal = xreal()

main.py:
from XReal import XReal
while True:
    print(XReal.get_arr())
import vispy # If this line is commented out, the exe generated works as expected.

The pyinstaller command:
pyinstaller main.py

Environment information:
OS: Win11
Python: 3.7.5
Pyinstaller: 5.13.2
vispy: 0.6.4

AirAPI_Windows.dll: GitHub - MSmithDev/AirAPI_Windows

Any suggestions?

Thanks in advance.

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