[IronPython] Loading DLL from pyc.py into ScriptEngine

[hellosticky]

Thanks Srivatsn, that makes perfect sense. The responsiveness of this mailing list is really amazing, Thank You!! 

> -----Original Message-----
> From: Srivatsn Narayanan [mailto:srivatsn at microsoft.com] 
> Sent: Tuesday, August 26, 2008 7:01 PM
> To: hellosticky at gmail.com; 'Discussion of IronPython'
> Subject: RE: [IronPython] Loading DLL from pyc.py into ScriptEngine
> 
> Clr.AddReference basically does two things. One it loads the 
> dll and two it pokes into the dll to see if there are any 
> compiled scriptcodes. If there are any, it then inserts a 
> CompiledLoader into sys.meta_path and lets the CompiledLoader 
> know about the these compiled scriptcodes - in this case one 
> called test.py
> 
> After that when an import is done, the normal import 
> mechanism kicks in which looks at meta_path and asks the 
> CompiledLoader as well to find out if it knows about "test" 
> and CompiledLoader returns the scriptcode. As with any import 
> then the code is executed. Hope that makes sense.
> 
> Michael, this will also answer your question as to why 
> runtime.LoadAssembly will not work. The compiledLoader needs 
> tobe informed about the script and that's a python specific thing.
> 
> -----Original Message-----
> From: hellosticky [mailto:hellosticky at gmail.com]
> Sent: Tuesday, August 26, 2008 3:46 PM
> To: Srivatsn Narayanan; 'Discussion of IronPython'
> Subject: RE: [IronPython] Loading DLL from pyc.py into ScriptEngine
> 
> Thanks, I will try that. Can you explain again how just doing 
> "import test" executes the test.py file that was compiled 
> into the DLL? It's not very logical..
> 
> Thanks,
> 
> > -----Original Message-----
> > From: Srivatsn Narayanan [mailto:srivatsn at microsoft.com]
> > Sent: Tuesday, August 26, 2008 6:34 PM
> > To: Discussion of IronPython; hellosticky at gmail.com
> > Subject: RE: [IronPython] Loading DLL from pyc.py into ScriptEngine
> >
> > Also Assembly.Load is not sufficient to be able to import the
> > compiled code. A clr.AddReference needs to be done which
> > publishes the module. The easiest way to do that is include
> > it in the string as Michael pointed out.
> >
> > ScriptSource source =
> > engine.CreateScriptSourceFromString("import
> > clr;clr.AddReference(\"test.dll\");import test",
> > SourceCodeKind.Statements);
> >
> > You might need to add the current folder to the path as well
> > before the clr.AddReference.
> >
> > -----Original Message-----
> > From: users-bounces at lists.ironpython.com
> > [mailto:users-bounces at lists.ironpython.com] On Behalf Of 
> Michael Foord
> > Sent: Tuesday, August 26, 2008 3:12 PM
> > To: hellosticky at gmail.com; Discussion of IronPython
> > Subject: Re: [IronPython] Loading DLL from pyc.py into ScriptEngine
> >
> > hellosticky wrote:
> > > I also tried:
> > >
> > >             Assembly assembly = Assembly.Load(AssemblyName);
> > >             ScriptRuntime runtime = ScriptRuntime.Create();
> > >             runtime.LoadAssembly(assembly);
> > >             ScriptScope scope = runtime.ExecuteFile("test.py");
> > >             object o = scope.Execute(null);
> > >
> > > But that threw a script not found exception saying it could
> > find the source file for test.py, so it would seem like this
> > wants to recompile it
> > >
> > >
> > >> -----Original Message-----
> > >> From: hellosticky [mailto:hellosticky at gmail.com]
> > >> Sent: Tuesday, August 26, 2008 5:52 PM
> > >> To: IronPython
> > >> Subject: Loading DLL from pyc.py into ScriptEngine
> > >>
> > >> Hi,
> > >>
> > >> I created an IronPython DLL with "ipy.exe pyc.py /out:test
> > >> /target:dll test.py" which created test.dll. Now, from C#,
> > >> I'd like to execute test.py from test.dll. I just opened up
> > >> dlr-spec-hosting and there's a CreateScriptSourceFromStream,
> > >> but I don't see that in 2.0 Beta 4 bits. Here is where I'm
> > >> stuck. How do I get that assembly into the engine and then
> > >> execute test.py?
> >
> > Well - the easiest way is to execute 'import test' after 
> having added
> > the assembly. This should execute the code in order to create
> > a module.
> >
> > ScriptScope scope = engine.CreateScope();
> > ScriptSource source =
> > engine.CreateScriptSourceFromString("import test",
> > SourceCodeKind.Statements);
> > engine.Execute(scope);
> >
> > There is an API for setting a stream as stdout on an engine -
> > 'runtime.IO.SetOutput'.
> >
> > Michael
> >
> > >>  Also, I'd like to get the output into a
> > >> string (I guess I can just redirect Console.Out?)
> > >>
> > >> public string Execute(string assemblyName)
> > >> {
> > >>     string content = null;
> > >>
> > >>     Assembly assembly = Assembly.Load(assemblyName);
> > >>     ScriptRuntime runtime = ScriptRuntime.Create();
> > >>     ObjectOperations operations = runtime.CreateOperations();
> > >>     ScriptEngine engine = runtime.GetEngine("py");
> > >>     // magic..
> > >>
> > >>     return content;
> > >> }
> > >>
> > >> Thanks,
> > >>
> > >
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