[IronPython] Newbie InterOp-related question

Tilley, Paul Paul.Tilley at Honeywell.com
Wed Mar 30 21:27:03 CEST 2011

Thanks Markus,


I'll use the info to try to figure out how things will work in my actual real world example. That involves the return of 4 or 5 arrays of strings and ints (horrible API I'm dealing with)




From: Markus Schaber [mailto:m.schaber at 3s-software.com] 
Sent: Wednesday, March 30, 2011 12:42 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Newbie InterOp-related question


Hi, Paul,


it's documented at http://ironpython.net/documentation/dotnet/dotnet.html#ref-and-out-parameters. 


The out parameter will be mapped as an additional return value.


So if myComObj.foo returns void, a simple call like


blah = myComObj.Foo()


should do the trick.





Von: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] Im Auftrag von Tilley, Paul
Gesendet: Mittwoch, 30. März 2011 01:10
An: users at lists.ironpython.com
Betreff: [IronPython] Newbie InterOp-related question




I've just started using IronPython but have hit a bit of a roadblock. This may also be caused by inadequate .Net knowledge.


In C# I can call a COM object (where the COM method is going to fill in the parameter) like so:

object blah;

myComObj.Foo(out blah);


If for example the COM method returns an array of strings ( with the parameter VARIANT* in COM method signature) then in C# I get an object[] back which with appropriate massaging I can process.


How would I declare the variable in Python if I want access the returned contents correctly? Knowing I was to get an array back I naively tried:

blah = []



The call is made correctly - I can see the COM object is filling out the return parameter OK but blah remains an empty list.

Any insights on what I should be doing more than welcome,







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