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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Unfortunately I don’t think what you want will work. If it’s
your .NET class you could implement __reduce_ex__ and I think we’d pick it up
and use that for the serialization. But if it’s some arbitrary framework class
then you’ll run into trouble. On IronPython 2.0 you could have an extension class
w/ the __reduce_ex__ function, have an ExtensionTypeAttribute that links the
.NET base class and the extension class, and then call
RuntimeHelpers.RegisterAssembly and we’d pick up the extension method.<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Also, we do have a feature request for this on CodePlex: <a
href="http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=13401">http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=13401</a>
Voting on it would raise its priority and we’d be more likely to do it sooner
rather than later.<o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> users-bounces@lists.ironpython.com
[mailto:users-bounces@lists.ironpython.com] <b>On Behalf Of </b>Paul Turbett<br>
<b>Sent:</b> Wednesday, March 26, 2008 4:56 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Question about serialization<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks Michael for the advice. Must appreciated.
Unfortunately I hasn't worked out yet tho :(<br>
<br>
I can use pickle from C# using Evaluate, or from within a Python class, on a
"pure" Python object. However any attempt at pickling a python object
that derives from a C# base result in an exception like this:<br>
Cannot convert MyObject(<MyObject object at 0x000000000000002B>) to Int32<br>
<br>
Exploring further, I came across Ops.GetDynamicType() and Ops.GetAttrsNames()
which I thought might be helpful to get the attributes of an object and
serialize it somehow (manually), but GetAttrNames requires an ICallerContext,
and I can't see how to get one of those.<br>
<br>
It seems that whilst serializing .NET classes is trivial, and serializing
python classes is trivial, serializing something that touches both is proving
quite difficult.<br>
<br>
Any further suggestions gratefully received!<br>
<br>
Thanks, Paul<br>
<br>
Michael Foord wrote: <o:p></o:p></p>
<pre>Paul Turbett wrote:<o:p></o:p></pre><pre> <o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>Hi,<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>I'm using IP as a scripting engine in a C# app. I have various Python <o:p></o:p></pre><pre>classes that derive from a C# base class, and have there own additional <o:p></o:p></pre><pre>data & functionality.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>I would like to be able to serialize instances of the Python classes <o:p></o:p></pre><pre>from the C# host for persistence across sessions. Using the standard <o:p></o:p></pre><pre>BinaryFormatter with the Serializable attribute is not working - I get <o:p></o:p></pre><pre>an error about the python class not being marked as serializable (the C# <o:p></o:p></pre><pre>base class is marked as serializable though).<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>How can I serialize python objects from C#? Should I use reflection to <o:p></o:p></pre><pre>roll my own serializer, or is there something in one of the lesser <o:p></o:p></pre><pre>documented assemblies like Ops I should use?<o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre></blockquote>
<pre><o:p> </o:p></pre><pre>Typically for serializing Python objects you would use pickle [1]. The <o:p></o:p></pre><pre>'dumps' function returns a string (make sure you use the text protocol <o:p></o:p></pre><pre>for IronPython).<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>You could then execute code inside the Python engine to serialize / <o:p></o:p></pre><pre>deserialize objects. I've not tried this for instances that inherit from <o:p></o:p></pre><pre>C# base classes - but it should work fine. :-)<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Michael Foord<o:p></o:p></pre><pre><a
href="http://www.ironpythoninaction.com">http://www.ironpythoninaction.com</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>.. [1] <a
href="http://docs.python.org/lib/module-pickle.html">http://docs.python.org/lib/module-pickle.html</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>I'm using IP 1.1.1 (but will move to 2.0 if that will help). Any <o:p></o:p></pre><pre>pointers & advice greatly appreciated!<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thanks, Paul<o:p></o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>Users mailing list<o:p></o:p></pre><pre><a
href="mailto:Users@lists.ironpython.com">Users@lists.ironpython.com</a><o:p></o:p></pre><pre><a
href="http://lists.ironpython.com/listinfo.cgi/users-ironpython.com">http://lists.ironpython.com/listinfo.cgi/users-ironpython.com</a><o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre></blockquote>
<pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>Users mailing list<o:p></o:p></pre><pre><a
href="mailto:Users@lists.ironpython.com">Users@lists.ironpython.com</a><o:p></o:p></pre><pre><a
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