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<p class=MsoNormal><span style='color:#1F497D'>Thank you very much Dino, I
added the folders that contain my assemblies to sys.path and then used
clr.AddReference to add a reference to them. The type error no longer exists.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Matt Bakalar<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Dino Viehland
[mailto:dinov@microsoft.com] <br>
<b>Sent:</b> Tuesday, June 01, 2010 1:41 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Uninformative Type Error<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>This is caused by having the
same assembly loaded into 2 different loader contexts at once (loader contexts
are a part of the CLR loading infrastructure). Adding references to
assemblies by file can be tricky. One possible solution might be to
install both assemblies into the GAC and then do clr.AddReference.
Another might be to make sure they’re next to ipy.exe (or whatever the
host process is if it’s not ipy.exe) and then also do a
clr.AddReference. You could also attempt to debug where the assemblies
are getting loaded and try to make the add reference to file work - that would
involve using fuslogvw.exe (logging all loads) and probably looking at
PythonContext.TryLoadAssemblyFromFileWithPath. But the other choices are
probably much easier and more robust.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><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"'>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>Bakalar, Matthew (NIH/CIT) [C]<br>
<b>Sent:</b> Tuesday, June 01, 2010 7:15 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> [IronPython] Uninformative Type Error<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hello All,<o:p></o:p></p>
<p class=MsoNormal>I am running into a frustrating exception. When attempting
to instantiate a class with an argument that is an instance of a different
class from a separate assembly, I receive an unhelpful type error from the
IronPython interpreter:<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>TypeError: expected XYZPositioner, got XYZPositioner<o:p></o:p></span></p>
<p class=MsoNormal>Both assemblies were loaded using
clr.AddReferenceToFileAndPath. I have tried to confirm the type of the object I
am passing as an argument to the constructor:<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>» A<span style='color:teal'>.</span>GetType<span
style='color:teal'>()</span> <span style='color:teal'>==</span> Target<span
style='color:teal'>.</span>Devices<span style='color:teal'>.</span>XYZPositioner<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>True<o:p></o:p></span></p>
<p class=MsoNormal>Is there any way to get more information about the error?
(The message reminds me of my days working in OCaml, where all of the error
messages were translated from French grammar and it was never clear how to
differentiate the object from the subject)<o:p></o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>Matt Bakalar<o:p></o:p></p>
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