Crash on getting bounds of BSpline of BRepAdaptor_Surface

[PP-SGRG]

Hi,

using pythonocc-core 7.7.2 getting the bounds from a BRepAdaptor_Surface crashes on Windows and on Linux.

On Windows it crashes with: Windows fatal exception: code 0xc0000374

Which is consistent to #1218 and seems like a very related error.

But the workaround proposed there to not chain the methods but call everything seperately does not work here.

from OCC.Core.BRepAdaptor import BRepAdaptor_Surface
from OCC.Core.IGESCAFControl import IGESCAFControl_Reader
from OCC.Core.TDF import TDF_LabelSequence
from OCC.Core.TDocStd import TDocStd_Document
from OCC.Core.XCAFDoc import XCAFDoc_DocumentTool


def get_bounds(adaptor):
    
    surface = adaptor.Surface()

    bspline = surface.BSpline()

    bounds = bspline.Bounds()

    result = list(bounds)
    return result


aReader = IGESCAFControl_Reader()
if aReader.ReadFile("testfile.igs") != 1:
    raise ValueError("Can't open IGES file.")

aDoc = TDocStd_Document("iges")
if not aReader.Transfer(aDoc):
    raise ValueError("Cannot transfer data from IGES file.")

shape_tool = XCAFDoc_DocumentTool.ShapeTool(aDoc.Main())

shp_labels = TDF_LabelSequence()
shape_tool.GetShapes(shp_labels)

shape_label = shp_labels.Value(1)
shape = shape_tool.GetShape(shape_label)

adaptor = BRepAdaptor_Surface(shape)

bounds = get_bounds(adaptor)

print(bounds)

print("done")

The crash always happens at the return statement of the get_bounds method even though I am returning a list of floats which I can print out while debugging just fine.

If I move the code outside of the method into the main script it actually works. But for me it is not feasible to not use methods in a larger piece of code.

I attached the testfile I used, which is just a random surface I created in CAD software. testfile.zip

PS: The code structure worked fine in version 7.4.1, after that those problems appeared.