[IronPython] FW: FW: FW: returning inherited classes to .NET
Curt Hagenlocher
curt at hagenlocher.org
Fri Feb 22 15:33:16 CET 2008
I built a test executable and was able to reproduce this. And when I
changed
clr.AddReferenceToFile("WebControlLibrary.dll")
to
clr.AddReference("WebControlLibrary")
it worked as expected.
On Fri, Feb 22, 2008 at 6:02 AM, Curt Hagenlocher <curt at hagenlocher.org>
wrote:
> Ah, no. I was thinking that you would modify your VB code to launch it as
> a console app (for instance) rather than from inside of ASP.NET<http://asp.net/>-- and see if you still get the same error.
>
>
> On Thu, Feb 21, 2008 at 10:07 PM, Howland-Rose, Kyle <
> Kyle.Howland-Rose at aar.com.au> wrote:
>
> > Thanks for your help so late Curt (not that I need a quick answer at
> > all).
> >
> > I am sure I am missing something big-time here and "talking" as
> > cross-purposes, but, to my mind the reason I don't have a problem when
> > running from the command line is because all I am doing is running the
> > ipy.exe on the file which loads some assemblies, creates a class
> > definition and a function definition and then terminates without even
> > instantiating the class. Is this what you mean by "running it
> > directly"?
> >
> > Thanks again,
> > Kyle
> >
> > ------------------------------
> > *From:* users-bounces at lists.ironpython.com [mailto:
> > users-bounces at lists.ironpython.com] *On Behalf Of *Curt Hagenlocher
> > *Sent:* Friday, 22 February 2008 4:55 PM
> > *To:* Discussion of IronPython
> > *Subject:* Re: [IronPython] FW: FW: returning inherited classes to .NET
> >
> > If you're only getting the error under ASP.NET <http://asp.net/>, then
> > it's highly likely that you're loading multiple copies of the same assembly,
> > which is why the CLR can't cast your Python class back to the VB base -- it
> > literally considers them to be two different classes. This may be related
> > to the way ASP.NET <http://asp.net/> makes shadow copies of your files,
> > but there could be other reasons as well (none of which, unfortunately, come
> > to mind right now).
> >
> > Using an interface instead of a base class would give you the same
> > results.
> > On Thu, Feb 21, 2008 at 9:44 PM, Howland-Rose, Kyle <
> > Kyle.Howland-Rose at aar.com.au> wrote:
> >
> > > It runs fine from the command line but then it does not do much ...
> > > yet. For the moment I am simplifying it by removing IP :(
> > >
> > > I wanted to so some moderately heavy reflection which to my thinking
> > > should be easier from IP but I will use VB for now.
> > >
> > > I assume I *should* be able to return a derived python class to VB?
> > > Alternatively I could implement an interface. How can IP implement a .NET
> > > interface?
> > > (All pointers to pre-existing doco warmly received :)
> > >
> > > Thanks
> > > Kyle
> > >
> > > ------------------------------
> > > *From:* users-bounces at lists.ironpython.com [mailto:
> > > users-bounces at lists.ironpython.com] *On Behalf Of *Curt Hagenlocher
> > > *Sent:* Friday, 22 February 2008 4:29 PM
> > > *To:* Discussion of IronPython
> > > *Subject:* Re: [IronPython] FW: returning inherited classes to .NET
> > >
> > > My apologies; I wasn't reading the code correctly. That's probably
> > > a sign that I should be going to bed. :) Have you tried simplifying your
> > > version just a little bit by running it directly rather than through
> > > ASP.NET <http://asp.net/>?
> > >
> > >
> > > On Thu, Feb 21, 2008 at 8:43 PM, Howland-Rose, Kyle <
> > > Kyle.Howland-Rose at aar.com.au> wrote:
> > >
> > > > Hi Curt,
> > > >
> > > > Thanks for replying. When I view the link I see the following:
> > > >
> > > > The .NET code creates the "Test" class and then runs the python code
> > > > which imports the "Test" class a subclasses it to create python
> > > > class
> > > > "X".
> > > >
> > > > Class "X" is then called and cast to type "Test" and assigned to the
> > > > value obj.
> > > >
> > > > Is this what you are looking at?
> > > >
> > > > My code is pretty much identical. The VB looks like:
> > > >
> > > >
> > > > Public MustInherit Class ChildControl
> > > > Public Function Control() As WebControl
> > > > Return Nothing
> > > > End Function
> > > > Public Function GetValue() As String
> > > > Return Nothing
> > > > End Function
> > > > Public Function SetValue(ByVal value As Object) As String
> > > > Return Nothing
> > > > End Function
> > > > End Class
> > > >
> > > > Class IPReflection
> > > > Private Shared Instance As IPReflection = Nothing
> > > > Private PyEngine As PythonEngine
> > > > Private PyModule As EngineModule
> > > >
> > > > Public Shared Function Inst() As IPReflection
> > > > If Instance Is Nothing Then
> > > > Instance = New IPReflection
> > > > End If
> > > > Return Instance
> > > > End Function
> > > >
> > > > Private Sub New()
> > > > Dim path As String = HttpContext.Current.Request.MapPath(".")
> > > > PyEngine = New PythonEngine
> > > > PyEngine.AddToPath(path)
> > > > PyModule = PyEngine.CreateModule
> > > > PyEngine.DefaultModule = PyModule
> > > >
> > > > PyEngine.ExecuteFile(HttpContext.Current.Request.MapPath
> > > > ("CustomControls
> > > > .py"))
> > > > End Sub
> > > >
> > > > Public Function GetChildControl() As ChildControl
> > > > Return
> > > > CType(Operations.Ops.Call(PyModule.Globals("GetControl")),
> > > > ChildControl)
> > > > End Function
> > > > End Class
> > > >
> > > > And the python looks like:
> > > >
> > > > import clr
> > > > import sys
> > > >
> > > > clr.AddReference('System')
> > > > import System
> > > >
> > > > sys.path.append(sys.path[0] + "/bin")
> > > >
> > > > clr.AddReferenceToFile("WebControlLibrary.dll")
> > > > clr.AddReference('System.Web')
> > > >
> > > > from System.Web.UI.WebControls import Label
> > > >
> > > > from WebControlLibrary import ChildControl
> > > >
> > > > class LabelChildControl(ChildControl):
> > > > def __init__(self):
> > > > self.control = Label()
> > > > def Control(self):
> > > > return self.control
> > > >
> > > > def GetControl():
> > > > return LabelChildControl()
> > > >
> > > >
> > > > Thanks again,
> > > > Kyle
> > > >
> > > > ________________________________
> > > >
> > > > From: users-bounces at lists.ironpython.com
> > > > [mailto:users-bounces at lists.ironpython.com] On Behalf Of Curt
> > > > Hagenlocher
> > > > Sent: Friday, 22 February 2008 3:08 PM
> > > > To: Discussion of IronPython
> > > > Subject: Re: [IronPython] returning inherited classes to .NET
> > > >
> > > >
> > > > The page in question doesn't seem to show what you describe --
> > > > deriving
> > > > a Python class from a C# class. Maybe you could show us your sample
> > > > code?
> > > >
> > > >
> > > > On Thu, Feb 21, 2008 at 7:39 PM, Howland-Rose, Kyle
> > > > <Kyle.Howland-Rose at aar.com.au> wrote:
> > > >
> > > >
> > > > Hi all,
> > > > I am following
> > > >
> > > >
> > > > http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET
> > > > <http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET
> > > > >
> > > > but using VB.
> > > >
> > > > In VB I declare a class and derive a python 1.1 class from it
> > > > but when I return it I get the exception:
> > > >
> > > > "Unable to cast object of type
> > > > 'IronPython.NewTypes.WebControlLibrary.ChildControl_1' to type
> > > > 'WebControlLibrary.ChildControl'."
> > > >
> > > > The page referenced above just seems to cast the python class
> > > > instance to the C# class instance but this does not work for me in
> > > > VB.
> > > >
> > > > Any help would be appreciated :)
> > > >
> > > > Thanks,
> > > >
> > > > Kyle
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ************************************************************************
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