Hi Curt,
Thanks very much. That worked a treat. I'm new to the DLR and IP2 so I didn't
know about GetVariable.
Cheers
Barry Carr
Curt Hagenlocher wrote:
You never actually assign a value to "obj". SetVariable doesn't create
a linkage between your local variable and the script-defined one. You
have to explicitly fetch out the value of "instance" by using something like
IMigration instance = scope.GetVariable<IMigration>("instance").
On Thu, Jul 3, 2008 at 7:34 AM, Barry Carr <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
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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