[IronPython] Returning an object from a script
Barry Carr
barrycarr at ixian-software.com
Thu Jul 3 16:34:12 CEST 2008
Hi,
Using IP2B3 (on .NET 2,0), is it possible to get a IronPython script to create an object and return
it or pass it back to the host application to be used later?
I tried what I thought was the obvious route but got a null reference exception when I tried to use
the returned object (the code is Oxygene - an Object Pascal variant):
class method ConsoleApp.Main;
begin
PrepPython;
var script := pe.CreateScriptSourceFromFile( ".\\PythonHostingTest.py" );
var scope := env.CreateScope;
var obj : Object := nil;
scope.SetVariable("instance", obj );
script.Execute(scope);
IMigration(obj).Up; // <-- Null ref exception here
Console.WriteLine('Hello World.');
end;
class method ConsoleApp.PrepPython;
begin
env := ScriptRuntime.Create;
env.LoadAssembly( typeOf(String).Assembly );
env.LoadAssembly( typeOf(Debug).Assembly );
env.LoadAssembly( typeOf(IMigration).Assembly );
pe := env.GetEngine("py");
end;
And here is my IronPython Script:
import System
from GeoMEM.NETandCF.Migrations import *
class Hello(IMigration):
def __init__( self, msg = "A BIIIG Hello From Python" ):
self.msg = msg
def Up(self):
print self.msg
def Down(self):
print "Down"
instance = Hello()
Am I close or barking up the wrong tree? Thanks.
Cheers
Barry Carr
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