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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ok, upon looking into this some more, I’m sad to say it looks
like this won’t work right now </span><span style='font-size:11.0pt;font-family:
Wingdings;color:#1F497D'>L</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'>. We need to figure out a way to run the
serialization for just the base class and how to do that isn’t entirely obvious
– so it probably won’t make 2.0. I’ve opened a bug to track the issue though: <a
href="http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=18823">http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=18823</a>
Feel free to vote on it so we’ll fix it sooner.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>Serge<br>
<b>Sent:</b> Monday, October 06, 2008 9:15 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Serializing IronPython classes<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Okay now this is getting
interesting. I assumed that the warning was about the child class, but I'm not
sure. A bit of info: The parent C# class is called Object. I did the
override on on __reduce_ex__ as you suggested but trying to
pickle still produced the same error: <br>
<br>
Type 'IronPython.NewTypes.Engine.Object_1$2' in Assembly 'Snippets.scripting,
Version=<a href="http://0.0.0.0">0.0.0.0</a>, Culture=neutral,
PublicKeyToken=null' is not marked as serializable.<br>
<br>
For curiosity, I called __reduce_ex__ on a child instance
and got the following error: expected Vector2, got Object_1$2<br>
<br>
There are several Microsoft.Xna.Framework.Vector2 members and it looks like
they're being replaced by this Object_1$2 which I assumed at first to be
the child class because of its name. <br>
__reduce_ex__ on the parent instances works fine. I'm out of my depth here so I
can't give more meaningful information.<o:p></o:p></p>
<div>
<p class=MsoNormal><span class=gmailquote>On 10/7/08, <b>Dino Viehland</b> <<a
href="mailto:dinov@microsoft.com">dinov@microsoft.com</a>> wrote:</span><o:p></o:p></p>
<div>
<div>
<p><span style='font-size:11.0pt;color:#1F497D'>Ahh, that sounds like a bad
bug, but I think I know what's causing it – we're hitting the new.NET
serialization support because __reduce_ex__ is now defined for you </span><span
style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span
style='font-size:11.0pt;color:#1F497D'> Can you add an override that
dispatches __reduce_ex__ to the object version, eg:</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'>def __reduce_ex__(self, *args):
</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> return
object.__reduce_ex__(self, *args)</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'>We should probably do that
automatically for user-defined instances which should be easy to do if this
works for you.</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:
10.0pt'> <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>
[mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Serge<br>
<b>Sent:</b> Monday, October 06, 2008 7:36 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Serializing IronPython classes</span><o:p></o:p></p>
</div>
<div>
<p> <o:p></o:p></p>
<p style='margin-bottom:12.0pt'>Thanks for the heads up, however trying to use
cPickle, I still get the error saying that the child class is not marked as
serializable..? <o:p></o:p></p>
<div>
<p>On 10/7/08, <b>Dino Viehland</b> <<a href="mailto:dinov@microsoft.com"
target="_blank">dinov@microsoft.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p><span style='font-size:11.0pt;color:#1F497D'>I would strongly encourage you
to use cPickle or pickle instead of .NET serialization. In 2.0 all .NET
serializable types can also be pickled – they define __reduce_ex__ which
handles this. </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'>First off we should be setting
the serializable bit on subclasses that are serializable – that's just a bug
that we're not doing that. But once we've done that the problem w/ .NET
serialization is that ultimately we need a static method or type that we can
point at that does the deserialization. For a user defined type in Python
we will need to be able to deserialize the type, the module the type lives in,
and presumably even the ScriptRuntime which holds the module. Pickle
handles this by serializing the module & type name but w/o a ScriptRuntime
we couldn't even get at that. We might have been able to require a
ScriptRuntime to be smuggled in the StreamingContext but it's not clear that it
would work well.</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'>So if you really want .NET
serialization we can fix the bug – but you'll need to implement ISerializable
and figure out some way to deal getting the class, module, and runtime
information saved/restored yourself.</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:
10.0pt'> <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>
[mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Serge<br>
<b>Sent:</b> Sunday, October 05, 2008 9:24 PM<br>
<b>To:</b> <a href="mailto:users@lists.ironpython.com" target="_blank">users@lists.ironpython.com</a><br>
<b>Subject:</b> [IronPython] Serializing IronPython classes</span><o:p></o:p></p>
</div>
<p> <o:p></o:p></p>
<p>I've run into problems with serialization. I have a serializable class
defined in C# which gets extended from IP, however when I try to serialize a
collection of both parent and child instances, I get an exception saying that
the IP generated class is not marked as serializable.<br>
<br>
With the lack of attributes, I am guessing I must do something else to enable
serialization?<br>
<br>
Regards, Serge.<o:p></o:p></p>
</div>
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