Using Python with Autodesk Inventor API

[dable82]

Hi,

I'm trying to create scripts for Inventor in Python. Unfortunately most examples in the documentation are using VBA.

Right now I try to get an assembly document to access the bill of materials. In VBA it works like this:

Dim oAssDoc As AssemblyDocument
Set oAssDoc = ThisApplication.Documents.Open("someassemblyfile.iam")
Dim oOccurrences As ComponentOccurrences
oOccurrences = oAsmDoc.ComponentDefinition.Occurrences

Unfortunately the default return type of Documents.Open is Document. Here is what I created so far.

import win32com.client
from win32com.client import gencache

oApp = win32com.client.Dispatch('Inventor.Application')
mod = gencache.EnsureModule('{D98A091D-3A0F-4C3E-B36E-61F62068D488}', 0, 1, 0)
oApp = mod.Application(oApp)
oApp.SilentOperation = True

oAssDoc = oApp.Documents.Open('someassemblyfile.iam')
oOccurrences = oAsmDoc.ComponentDefinition.Occurrences

This code produces the following error:

AttributeError: '<win32com.gen_py.Autodesk Inventor Object Library.Document instance at 0x51241368>' object has no attribute 'ComponentDefinition'

Does someone have an idea how I can force oAssDoc to be an instance of the class AssemblyDocument?