Excel Interop in Rhino 8 Script Editor (Python 2)

Scripting
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1

I am having trouble with the new script editor, running below code gives an error in Rhino 8 while it runs fine in Rhino 7? Any ideas?

The error: IOError: System.IO.IOException: Could not add reference to assembly Microsoft.Office.Interop.Excel

#! python 2
import clr
clr.AddReference("Microsoft.Office.Interop.Excel")
from Microsoft.Office.Interop import Excel
2

Found a fix here, apperently this has to do with the new .Net Core 7 versus .Net 4.2 in Rhino 7.

3

Another fix is to use clr.AddReferenceToFileAndPath("path_to_dll_file"). This does work with the new .NET Core 7 of Rhino 8.

For some reason using clr.AddReference() does not find the Windows Assembly folder containing the .dll files for Interop Assemblies (such as Office, etc.)

4

Hi there. I tried the method you mentioned in Rhino 8 (python 3) but it says the Name Attribute module ‘clr’ has no attribute ‘AddReferenceToFileAndPath’. It’s not working actually

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5

@Amir_Gabrielli The clr module in Python 3 does not have the AddReferenceToFileAndPath method (IronPython 2 does).

Use clr.AddReference and provide the full dll path as input argument

6

I tried to do that but I failed. I’m not sure which part I’m doing wrong. I’m trying to import Excel Application Class as shown in the picture below but in Rhino 8 the old method is not working.

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7

It might be because you are trying via grasshopper python? My solution worked with rhino ironpython directly.

8

Yes I’m working within grasshopper so I’m using python 3 to import Excel Application Class

9

C:\Windows\assembly\Microsoft.Office.Interop.Excel is not a file path. Add the .dll to the end:

C:\Windows\assembly\Microsoft.Office.Interop.Excel.dll

10

I also tried that but it’s having trouble finding such a file and it gives the following error.

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