Hello Jan,

The problem you are facing is related to the updated PythonNET 3.x version which works slightly different than the previous versions. There are three possible ways to solve or bypass this issue.

The two of them can be found in the following forum post:

Also, more in-depth information on how the PythonNET 3.x version causes this issue can be found here:

According to these, the first way is to simply downgrade your PythonNET version to 2.5.2, but this is not recommended.

The second way is to replace this part of your script:

d.ObjectData.XHalfWidth = 5
d.ObjectData.YHalfWidth = 5

with:

d.get_ObjectData().__implementation__.XHalfWidth = 5
d.get_ObjectData().__implementation__.YHalfWidth = 5

or, more similarly to your original syntax, with:

d.ObjectData.__implementation__.XHalfWidth = 5
d.ObjectData.__implementation__.YHalfWidth = 5

However, this method is unintuitive, and decreases code readability.

The third way is to install and use the ZOSPy v1.2.0 open-source library, which, apart from serving other functionalities, is a definitive and the recommended solution for problems related to PythonNET 3.x. Extended information on how it tackles these issues can be found on this forum post:

In your case, the code after installing ZOSPy, should be functional in the following way, without needing the default “PythonStandaloneApplication” script:

import os
import zospy as zp

zos = zp.ZOS()
oss = zos.connect("standalone")
ZOSAPI = zos.ZOSAPI

lensname = os.path.join(os.sep, lensdir, lensfile)
oss.load(lensName, False)

TheNCE = oss.NCE

d = TheNCE.GetObjectAt(2)  # Detector Rectangle

o = d.GetObjectTypeSettings(ZOSAPI.Editors.NCE.ObjectType.DetectorRectangle)

d.ChangeType(o)

d.ObjectData.XHalfWidth = 5

d.ObjectData.YHalfWidth = 5

oss.save_as('B.zos')

del zos
zos = None

I recommend you devote a few minutes on the the ZOSPy documentation; I hope you will find it a useful and intuitive tool.

Kind regards,

Stavros Sklavenitis
Application Engineer