[Libreoffice] [GSOC] Java > Python, problem with uno.invoke

John LeMoyne Castle jlc at mail2lee.com
Fri May 27 22:12:31 PDT 2011

Hi Xisco, 
I think your Java->Python porting project is awesome.  My experience is thin
on many counts here: Java, Python, pyuno and LibreOffice, but I have been
curious about them all, so I dove in a little on your question.  

My short answer of encouragement: Yes, you can solve it! 

One question is how are you treating PropertyValue? 
If PropertyValue can still be either boolean or a list of strings (in your
Python as in the Java) then your initial test "If PropertyValue:" may
prevent setting *any* property to false.  I think this safety check is moot
anyway: Python will complain and quit before calling the setControlProperty
function with nothing as the third argument object.  

I see that the invoke call is new - nice to see the setControlProperty
function actually setting the property on the control ;-)  I think the path
that call takes is through the extern C static invoke at:
through PYUNO_invoke at:
where it seems that the Any wrapper is optional (!!).  If you do pass
PYUNO_invoke a tuple of Anys it just unpacks them before making a call like: 
object.name(tuple of args)

I see that the Any wrapper is required to make calls through the
Adapter::invoke here:
--- but I'm sure you are not calling that invoke as it has a very different
signature.  The extern C static invoke function requires the third arg to be
a tuple, so I think it is sufficient to test for tuple type and then make
the singletons a tuple of 1 before the invoke call.  

Finally, from the way PYUNO_invoke turns the ControlName and PropertyName
into the callable function object, I think that passing the PropertyName as
the second argument is sufficient - it doesn't need to go in the tuple as

My understanding is that Java needs the Any foo to pass both simple types
and objects as generic objects whereas everything in Python is an object so
... your Python glue code may often be simpler than the original Java.   

Please remember I'm no expert -- I just spent a few hours on this to start
to dig into pyuno while doing a full LibreOffice build ... 

Hope This Helps,

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