Re: How to pass a Java callable to C#?

On Sun, Feb 16, 2014 at 8:41 AM, Jeroen Frijters <[email protected]> wrote:

> Hi Doug,
>
> Your C# on_click method is callable from (IKVM) Java.
>
> You'll need to generate a class that implements the
> cli.System.Func$$00602_$$$_Ljava__lang__Object_$$_Ljava__lang__Object_$$$$_$Method
> interface.
>
>
Jeroen,

Thanks for these details; can you expand a bit on this?
Where did the name
"cli.System.Func$$00602_$$$_Ljava__lang__Object_$$_Ljava__lang__Object_$$$$_$Method"
come from?
What is that?
How do you create an interface that implements it?

I've read and googled looking for details on signatures and IKVM, but I
can't find anything that appears to be relevant.

-Doug


> This class can then be instantiated and passed to the constructor of the
> cli.System.Func$$00602_$$$_Ljava__lang__Object_$$_Ljava__lang__Object_$$$$_
> class (the delegate) and this object can be passed to the on_click method.
>
> Regards,
> Jeroen
>
> > -----Original Message-----
> > From: Doug Blank [mailto:[email protected]]
> > Sent: Sunday, February 16, 2014 13:46
> > To: Jeroen Frijters
> > Cc: [email protected]
> > Subject: Re: [Ikvm-developers] How to pass a Java callable to C#?
> >
> > Jeroen,
> >
> > Thanks for the feedback, but I think I didn't explain very well my
> > problem. The Widget library is written in C# and is being used by the
> > Java interpreter (running on the CLR). I wish to be able to register the
> > callback in Java.
> >
> > This works in IronPython, because IronPython knows how to map Python
> > functions onto Func<object,object>:
> >
> > """
> > from Widgets import Widget
> > def f(obj):
> >     print("Click!")
> > w = Widget()
> > w.on_click(f)
> > """
> >
> > I have the same working in a Scheme running on the CLR, because I can
> > define and wrap around callback1 in C#  to map it to
> > Func<object,object>:
> >
> > """
> > (using "Widgets")
> > (define f (lambda (obj) (printf "~a\n" obj)) (define w (Widget))
> > (w.on_click (callback1 f)) """
> >
> > So, I'm trying to figure out how to do the same thing in Java: map
> > something in Java onto Func<object,object>, so something like this will
> > work in DynamicJava:
> >
> > """
> > import static cli.Widgets.*;
> >
> > public int f(Object widget) {
> > }
> >
> > Widget w = new Widget();
> > w.on_click(f);
> > """
> >
> > Does ikvm have something built-in to help pass a Java function to C#? Or
> > do you have a general strategy for doing this?
> >
> > Thanks for any further hints,
> >
> > -Doug
> >
> >
> > On Sun, Feb 16, 2014 at 4:21 AM, Jeroen Frijters <[email protected]
> > <mailto:[email protected]> > wrote:
> >
> >
> >       Hi Doug,
> >
> >       I'm probably misunderstanding the question, but in Java you'd use
> > interfaces for this. See
> > http://docs.oracle.com/javase/7/docs/api/java/awt/Button.html#addActionL
> > istener(java.awt.event.ActionListener) for example.
> >
> >       Regards,
> >       Jeroen
> >
> >
> >       > -----Original Message-----
> >       > From: Doug Blank [mailto:[email protected]
> > <mailto:[email protected]> ]
> >       > Sent: Sunday, February 16, 2014 0:57
> >       > To: [email protected] <mailto:ikvm-
> > [email protected]>
> >       > Subject: [Ikvm-developers] How to pass a Java callable to C#?
> >       >
> >       > I am doing some refining on the DynamicJava interpreter written
> > in Java
> >       > that is running under Mono [1]. (C# libraries are made available
> > to the
> >       > interpreted Java through ikvmstub, and the Java interpreter is
> > running
> >       > by being compiled with ikvmc). Everything is working very well,
> > but one
> >       > thing I would like to do is be able to pass a Java callback to a
> > C#
> >       > function.
> >       >
> >       >
> >       > The C# code looks like this (although I could change it in any
> > manner):
> >       >
> >       >
> >       > public class Widget {
> >       > public void on_click(System.Func<object,object> function) {
> >       >         }
> >       > }
> >       >
> >       > In general, how would a Java program register a callback to the
> > C#? I
> >       > can write an interface on either the Java side, or the C# side.
> >       >
> >       > Thanks for any suggestions,
> >       >
> >       > -Doug
> >       >
> >       > [1] -
> >       >
> > https://bitbucket.org/ipre/calico/src/master/languages/Java/dynamicjava/
> >
> >
>
>

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