[IronPython] "GetSearchPaths" does not return the default directories when run in a new Appdomain

[Dino Viehland]

You can manually provide the search paths:

Dictionary<string, object> options = new Dictionary<string, object>();
options["SearchPaths"] = new [] { ".", "C:\\SomeDirectory\\DLLs", "C:\\SomeDirectory\\Libs" };
ScriptEngine engine = Python.CreateEngine(ad, options);

I don't know of a way to set the entry assembly other than via starting an .EXE
Normally.

> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-
> bounces at lists.ironpython.com] On Behalf Of mohammad mustaq
> Sent: Friday, August 20, 2010 5:16 AM
> To: Discussion of IronPython
> Subject: [IronPython] "GetSearchPaths" does not return the default directories
> when run in a new Appdomain
> 
> Hi,
> 
> When I create a python engine in a new Appdomain the "GetSearchPaths"
> method return only the current directory. In default domain it returns
> "Lib" as well as "Dll" directory in IronPython 2.6.1. Is there a way
> to get these search paths while the engine is created in a new
> Appdomain.
> 
> The reason being that the domain manager of the new Appdomain does not
> have  any information regarding the "EntryAssembly". Is there a way to
> get the data in the Host's domain manager to the new Appdomain's
> domain manager. I have provided a code illustrating this.
> 
> 
> using System;
> using Microsoft.Scripting;
> using IronPython.Hosting;
> using Microsoft.Scripting.Hosting;
> using System.Runtime.Remoting;
> using System.Runtime.Remoting.Lifetime;
> 
> class Foo
> {
>     public static void Main(string[] args)
>     {
>         AppDomain ad = AppDomain.CreateDomain("foo");
>         ScriptEngine engine = Python.CreateEngine(ad);
>         engine.Runtime.LoadAssembly(typeof(MbrBase).Assembly);
> 
>         ScriptSource code = engine.CreateScriptSourceFromString(@"
> import MbrBase
> class C(MbrBase):
>     def Test_C(self, log):
>         print 0
> a = C()
> ", SourceCodeKind.Statements);
> 
>         ScriptScope scope = engine.CreateScope();
> 
>         code.Execute(scope);
> 
>         Console.WriteLine("Trying to do it... {0}",
> AppDomain.CurrentDomain.Id);
>         MbrBase mbr = (MbrBase)scope.GetVariable("a");
> 
>         string isSubClassCode = String.Format("issubclass({0},{1})",
> "C", "MbrBase");
>         ScriptSource script =
> engine.CreateScriptSourceFromString(isSubClassCode,
> SourceCodeKind.Expression);
> 
>        ICollection<string> paths = engine.GetSearchPaths(); // It
> returns only current directory.
> 
>         bool result = (bool)script.Execute(scope);
> 
>         if (result == true)
>         {
>             ObjectOperations ops = engine.Operations;
>             ObjectHandle subClass = scope.GetVariableHandle("C");
> // get back a handle
>             ObjectHandle instance = ops.Call(subClass, new
> ObjectHandle[0]);  // invoke the handle to create an instance
>             mbr = instance.Unwrap() as MbrBase;  // now we know we
> have an MBR and we can unwrap it to our local side
> 
>             ObjectHandle temp = ops.GetMember(instance, "Test_C");
>             object log = null;
>             ops.Call(temp, log);
>         }
> 
>         mbr.DoItVirtually();
>         mbr.DoIt();
>         Console.ReadKey();
>     }
> }
> 
> public class MbrBase : MarshalByRefObject
> {
>     public virtual void DoItVirtually()
>     {
>         Console.WriteLine("Did it virtually {0}", AppDomain.CurrentDomain.Id);
>     }
> 
>     public void DoIt()
>     {
>         Console.WriteLine("Did it {0}", AppDomain.CurrentDomain.Id);
>     }
> }
> 
> thanks,
> Mustaq
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