[IronPython] i thought this is odd: using Interop on Microsoft Word

[Shri Borde]

This could be fixed in IronPython but currently its expected.

docs[1] is calling into this indexer in Microsoft.Office.Interop.Word.dll. The indexer method takes the index by-reference. Ie as "object&" instead of just "object".

.method instance class Microsoft.Office.Interop.Word.Document
        get_Item([in] object&  marshal( struct) Index)
{
} // end of method Documents::get_Item

IronPython thinks that is a ref parameter that could potentially by updated by the call. Hence, it returns it back as one of the return values.

>>> returnValues = docs[1]
>>> returnValues[0] # real return value
Microsoft.Office.Interop.Word.DocumentClass
>>> returnValues[1] # the by-ref param included in the return value.
1
>>>

In C#, you would have to use the "ref" keyword to index into docs. You can simulate this in IronPython as such

>>> docs[clr.Reference[object](1)]
Microsoft.Office.Interop.Word.DocumentClass
>>>

IronPython could fix this by paying attention to the "[in]" in the signature. It appears as a custom attribute of type System.Runtime.InteropServices.InAttribute on the parameter. I have opened http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=13641 to track this.

-----Original Message-----
From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Kelie
Sent: Friday, November 02, 2007 12:45 AM
To: IronPython Users
Subject: [IronPython] i thought this is odd: using Interop on Microsoft Word

Hello group,

import clr
clr.AddReference("Microsoft.Office.Interop.Word")
import Microsoft.Office.Interop.Word as Word

_progid_ = "Word.Application"

def get_active_object(progid):
    from System.Runtime.InteropServices import Marshal
    try:
        app = Marshal.GetActiveObject(progid)
    except:
        app = None
    return app

def get_active_application():
        return get_active_object(_progid_)

def get_documents():
    return get_active_application().Documents

if __name__ == '__main__':
    docs = get_documents()
#    print docs[1].FullName # This line causes AttributeError:
                            # 'tuple' object has no attribute 'FullName'
    print docs[1] # returns (Microsoft.Office.Interop.Word.DocumentClass, 1)
    print docs[2] # returns (Microsoft.Office.Interop.Word.DocumentClass, 2)
    print docs[1][0].FullName

This is the code that i tested. For the last couple of lines, i was
expecting that
docs[1] and docs[2] would return the document object instead of a
tuple with the first of its item being the document. Is this the
intended behavior?

Thank you,

--
Kelie
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