[IronPython] Fail to execute "import System" on Silverlight embedded interpreter

[Jimmy Schementi]

Kay,

This are a couple bad bugs in the current sources; we desperately need to have better test coverage on embedding IronPython in a C# Silverlight app (hopefully I'll get time for that next month). In the meantime, here are fixed, unsigned binaries: http://github.com/jschementi/orphanage/tree/master/embedding-ipy/Dependencies/. The IronPython and DLR sources should have the fix in the next couple days, and we'll discuss getting these fixes in for 2.6 RTM.

Michael, I finally tracked down what is causing your sub-directory module importing issue:
http://blog.jimmy.schementi.com/2009/11/embedding-ironpython-in-silverlight.html

In short, an empty file in the XAP file is the same as a non-existent file, so make sure your __init__.py file(s) are not empty.

~js

> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-
> bounces at lists.ironpython.com] On Behalf Of Michael Foord
> Sent: Tuesday, November 10, 2009 12:25 PM
> To: Discussion of IronPython
> Subject: Re: [IronPython] Fail to execute "import System" on Silverlight
> embedded interpreter
> 
> Kay Schluehr wrote:
> > Hi IronPython list,
> >
> > I worked along Michael Foords introductory article about embedding
> > IronPython in Silverlight together with his
> > "EmbeddingIronPythonSilverlight" project documented here:
> >
> >
> http://www.voidspace.org.uk/ironpython/silverlight/embedding_ironpytho
> > n.shtml
> >
> >
> > I added the following two lines to the source code
> >
> >  source = pe.CreateScriptSourceFromString("import System",
> > SourceCodeKind.Statements);  source.Execute(scope);
> >
> > This worked all well with the given built and the shipped assemblies.
> >
> > Yesterday I downloaded the DLR dlr-34133, built it and replaced the
> > assemblies of the "EmbeddingIronPython..." project with the latest
> > SilverlightDebug ones. Running the code again I get following import
> > error:
> >
> > System.NullReferenceException wurde nicht von Benutzercode behandelt.
> >  Message="Der Objektverweis wurde nicht auf eine Objektinstanz
> > festgelegt."
> >  StackTrace:
> >       bei
> > Microsoft.Scripting.Silverlight.DynamicApplication.get_BaseUri()
> >       bei
> > Microsoft.Scripting.Silverlight.DynamicApplication.MakeUri(Uri
> > baseUri, Uri relativeUri)
> >       bei
> > Microsoft.Scripting.Silverlight.HttpVirtualFilesystem.GetFileInternal(
> > Object
> > baseUri, Uri relativeUri)
> >       bei
> > Microsoft.Scripting.Silverlight.BrowserVirtualFilesystem.GetFileIntern
> > al(Object
> > storageUnit, String relativePath)
> >       bei
> > Microsoft.Scripting.Silverlight.BrowserVirtualFilesystem.GetFile(Objec
> > t
> > storageUnit, String relativePath)
> >       bei
> > Microsoft.Scripting.Silverlight.BrowserVirtualFilesystem.GetFile(Strin
> > g
> > relativePath)
> >       bei Microsoft.Scripting.Silverlight.BrowserPAL.FileExists(String
> > path)
> >       bei
> IronPython.Runtime.Importer.LoadModuleFromSource(CodeContext
> > context, String name, String path)
> >       bei
> > IronPython.Runtime.Importer.LoadPackageFromSource(CodeContext
> context,
> > String name, String path)
> >       bei IronPython.Runtime.Importer.LoadFromDisk(CodeContext
> > context, String name, String fullName, String str)
> >       bei IronPython.Runtime.Importer.ImportFromPathHook(CodeContext
> > context, String name, String fullName, List path, Func`5 defaultLoader)
> >       bei IronPython.Runtime.Importer.ImportFromPath(CodeContext
> > context, String name, String fullName, List path)
> >       bei IronPython.Runtime.Importer.ImportTopAbsolute(CodeContext
> > context, String name)
> >       bei IronPython.Runtime.Importer.ImportModule(CodeContext
> > context, Object globals, String modName, Boolean bottom, Int32 level)
> >       bei IronPython.Modules.Builtin.__import__(CodeContext context,
> > String name, Object globals, Object locals, Object fromlist, Int32
> > level)
> >  InnerException:
> >
> >
> > Apparently, pre-loading assemblies in the loop
> >
> >    foreach (string name in new string[] { "mscorlib", "System",
> > "System.Windows", "System.Windows.Browser", "System.Net" })
> >    {
> >
> >
> runtime.LoadAssembly(runtime.Host.PlatformAdaptationLayer.LoadAssembl
> y
> > (name));
> >
> >    }
> >
> > had no effect and IronPython attempts to load the 'System' module from
> > the disk as a Python module. The standard import routine "import clr;
> > clr.AddReference("System"); import System" causes the same problem.
> > I'm puzzled.
> 
> I've had horrible problems with imports in Silverlight when using embedded
> IronPython and didn't really get any good answers I'm afraid. :-(
> 
> Michael
> 
> >
> > Regards, Kay
> >
> >
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.ironpython.com
> > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
> 
> 
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