[IronPython] Internal Assembly Dependency

Thu May 27 22:54:43 CEST 2010

Thanks for the suggestion, I tried the bug fix suggested on the link you posted. clr.LoadAssemblyFromFile does not throw an exception, but it also doesn't return an assembly (in contrast, calling clr.LoadAssemblyFromFile for a different assembly in the same directory returns an object that prints itself as: <Assembly Target, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null>)
I have been picking through the log files, but I am inexperienced interpreting them. The first log item shows an error, but after that I receive two log items that claim "The operation was succesful. Bind result: hr = 0x0." To confuse matters, at the end of these "successful" log entries is the line:
LOG: IJW assembly bind returned file not found.

I looked up the error in the first log message, hr = 0x80070002. I found a reference at http://blogs.msdn.com/b/suzcook/archive/2003/05/29/57120.aspx that suggests it is actually a FileNotFoundException. Would this error ever be thrown when the assembly did actually exist? As I said before, I'm using it from this location with pure C# code. I have double checked my sys.path to make sure it includes the folder where the assembly is located. Could the problem be in the naming of the assembly?

For reference sake, I am running windows vista x64.

Thanks

Matthew Bakalar

The following items are logged when I attempt to load the problem assembly:

*** Assembly Binder Log Entry  (5/27/2010 @ 4:39:16 PM) ***

The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
Running under executable  C:\Users\bakalarmh\AppData\Local\Microsoft\VisualStudio\10.0\Extensions\Microsoft\IronPython Tools for Visual Studio\0.2\RemoteScriptFactory.exe
--- A detailed error log follows.

=== Pre-bind state information ===
LOG: User = NIH\bakalarmh
LOG: DisplayName = MathNet.Iridium, Version=2008.8.16.470, Culture=neutral, PublicKeyToken=c061a3ec32cc0c6f
 (Fully-specified)
LOG: Appbase = file:///C:/Users/bakalarmh/AppData/Local/Microsoft/VisualStudio/10.0/Extensions/Microsoft/IronPython Tools for Visual Studio/0.2/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = RemoteScriptFactory.exe
Calling assembly : (Unknown).
===
LOG: This bind starts in default load context.
LOG: No application configuration file found.
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Post-policy reference: MathNet.Iridium, Version=2008.8.16.470, Culture=neutral, PublicKeyToken=c061a3ec32cc0c6f
LOG: The same bind was seen before, and was failed with hr = 0x80070002.
ERR: Unrecoverable error occurred during pre-download check (hr = 0x80070002).

*** Assembly Binder Log Entry  (5/27/2010 @ 4:39:16 PM) ***

The operation was successful.

Bind result: hr = 0x0. The operation completed successfully.

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll

Running under executable  C:\Users\bakalarmh\AppData\Local\Microsoft\VisualStudio\10.0\Extensions\Microsoft\IronPython Tools for Visual Studio\0.2\RemoteScriptFactory.exe

--- A detailed error log follows.

LOG: IJW explicit bind. File path:C:\Users\bakalarmh\Documents\NIH Dropbox\My Dropbox\Target\Target\bin\Debug\MathNet.Iridium.DLL.

LOG: IJW assembly bind returned file not found.

*** Assembly Binder Log Entry  (5/27/2010 @ 4:39:16 PM) ***

The operation was successful.

Bind result: hr = 0x0. The operation completed successfully.

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll

Running under executable  C:\Users\bakalarmh\AppData\Local\Microsoft\VisualStudio\10.0\Extensions\Microsoft\IronPython Tools for Visual Studio\0.2\RemoteScriptFactory.exe

--- A detailed error log follows.

LOG: IJW explicit bind. File path:C:\Users\bakalarmh\Documents\NIH Dropbox\My Dropbox\Target\Target\bin\Debug\MathNet.Iridium.dll.

LOG: IJW assembly bind returned file not found.

From: Curt Hagenlocher [mailto:curt at hagenlocher.org]
Sent: Thursday, May 27, 2010 4:14 PM
To: Discussion of IronPython
Subject: Re: [IronPython] Internal Assembly Dependency

The bug at http://ironpython.codeplex.com/WorkItem/View.aspx?WorkItemId=26793 suggests you might have success with clr.LoadAssemblyFromFile. Otherwise, you might be able to use the Fusion log viewer (http://msdn.microsoft.com/en-us/library/e74a18c4(VS.80).aspx) to debug the assembly load process.
2010/5/27 Bakalar, Matthew (NIH/CIT) [C] <bakalarmh at mail.nih.gov<mailto:bakalarmh at mail.nih.gov>>
In response to Lukas:
I copied all of the assemblies, along with the script, to one folder. I attempted to add a reference to MathNet.Iridium and received the following error:

>>> clr.AddReferenceByPartialName('MathNet.Iridium')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: System.IO.IOException: Could not add reference to assembly MathNet.Irid
ium
   at Microsoft.Scripting.Actions.Calls.MethodCandidate.Caller.Call(Object[] arg
s, Boolean& shouldOptimize)
   at IronPython.Runtime.Types.BuiltinFunction.BuiltinFunctionCaller`2.Call1(Cal
lSite site, CodeContext context, TFuncType func, T0 arg0)
   at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite s
ite, T0 arg0, T1 arg1, T2 arg2)
   at IronPython.Runtime.Types.BuiltinFunction.BuiltinFunctionCaller`2.Call1(Cal
lSite site, CodeContext context, TFuncType func, T0 arg0)
   at IronPython.Compiler.Ast.CallExpression.Invoke1Instruction.Run(InterpretedF
rame frame)
   at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 a
rg1)
   at IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx)
   at IronPython.Compiler.PythonScriptCode.Run(Scope scope)
   at IronPython.Hosting.PythonCommandLine.<>c__DisplayClass1.<RunOneInteraction
>b__0()

This leads me to believe IronPython is having trouble loading this particular assembly, but I cannot decode the error message. Have you ever seen this trace before?

In Response to David:
I tried the solution you suggested with no luck. The error message I receive is the same. I suspect that the hint I've provided above might lead us to a solution.

Thanks All,

Matthew Bakalar

From: Lukas Cenovsky [mailto:cenovsky at bakalari.cz<mailto:cenovsky at bakalari.cz>]
Sent: Thursday, May 27, 2010 2:48 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Internal Assembly Dependency

Bakalar, Matthew (NIH/CIT) [C] wrote:
Hello All,
I am new to IronPython, relatively new to C#, and new to this list. I have a C# assembly that I am attempting to access from IronPython. I am able to load the assembly using:
clr.AddReferenceToFileAndPath(mypath)
without any problems. I can then import the classes that reside within my assembly as well, create instances of these classes, and call certain methods on these instances. There are methods within this assembly that rely on a reference to another assembly (MathNet.Iridium). When I attempt to call these methods from my IronPython script, I receive the following error:
IOError: [Errno 2] Could not load file or assembly 'MathNet.Iridium, Version=2008.8.16.470, Culture=neutral, PublicKeyToken=c061a3ec32cc0c6f' or one of its dependencies. The system cannot find the file specified.
Now, I never added a reference to MathNet.Iridium in my script. However, I assumed that the C# assembly that I am calling directly was compiled with a reference to this other assembly, and that I would not have to explicitly add a reference. When I create a test assembly entirely in C# that calls the assembly I am attempting to call, and do not include a reference to the MathNet.Iridium assembly, I am able to execute the code without problems. Do I need to add a reference to the MathNet.Iridium assembly from within my IronPython script even though I don't intend to access it directly?
Thanks
Matthew Bakalar

First, try to copy all necessary assemblies to the folder with your script and use AddReference for all of them. If that works, you can experiment with assemblies in different folders.

Note, the path in AddReferenceToFileAndPath should be full path.

--
-- Lukáš

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