Hello all (especially John),
I've been experimenting with calling into IronPython from Javascript
using Silverlight.
The way to call into managed code is to mark classes and methods with a
Scriptable attribute. Obviously you can't do this from IronPython -
still no attributes support ;-). The obvious way to attempt is to create
a C# class with the attributes and subclass from IronPython.
I have a basic C# example working, so I know I'm on the right track.
Unfortunately it fails to work from IronPython (either using the C#
class directly or a subclass). The error is:
Script object of type 'ScriptableClass.Class' contains a script member
'method' with an invalid type ('System.Object').
Exception Details: System.NotSupportedException: Script object of type
'ScriptableClass.Class' contains a script member 'method' with an
invalid type ('System.Object')..
Stack Trace:
at OnLoad in test.py, line 22
This could be because it is only valid to return a string or other
primitive type from a Scriptable method. I wonder if when done from
inside IronPython the method signature is mutated to appear as if it
returns Object ?
Here is the basic C# code:
using System;
using System.Windows.Browser;
namespace ScriptableClass
{
[Scriptable]
public class Class
{
[Scriptable]
public object method()
{
return this._method();
}
public object _method()
{
return "hello";
}
}
}
The Python code that calls it (adding the reference is working now - God
knows why - must have been an oddity on my system - sorry):
import clr
clr.AddReference("ScriptableObjects, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null")
import System
import System.Windows.Browser
from System.Windows import WebApplication
from System.Windows.Browser import HtmlPage
from ScriptableClass import Class
class Subclass(Class):
def _method(self):
return 'wobble'
def OnLoad(sender, e):
example1 = Class()
example2 = Subclass()
WebApplication.Current.RegisterScriptableObject("test1", example1)
WebApplication.Current.RegisterScriptableObject("test2", example2)
The error is at the *first* call to "RegisterScriptableObject" - so it
isn't even with the subclass...
If anyone has any clues as to how I might work round this then it would
be much appreciated. (I have already tried moving the call to
"RegisterScriptableObject" into C#, but still passing in instances
created in Python code and this made no difference.)
All the best,
Michael Foord
http://www.voidspace.org.uk/ironpython/index.shtml
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