Python.NET August 2010

pythonnet@python.org

5 participants
4 discussions

This assembly is built by a runtime newer than t he currently loaded runtime
by Dave 19 Sep '10

19 Sep '10

I needed to access .NET dlls compiled for .NET4 and ran into the error: System.BadImageFormatException: This assembly is built by a runtime newer than t he currently loaded runtime and cannot be loaded. (Exception from HRESULT: 0x801 3101B) So I attempted to recompile PythonDotNET for .NET4. In VS2010 I changed all the project targets to be .NET4 and it compiled fine with only a couple of errors about System.Security.Permissions.SecurityAction.RequestMinimum being obsolete. Unfortunately when I tried to import clr I got the following error: SystemError: dynamic module not initialized properly Looking further into it I found that in buildclrmodule.bat lines 33 & 66 referenced the .NET2 idalsm.exe: %windir%\Microsoft.NET\Framework\v2.0.50727\ilasm /nologo /quiet /dll %ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH% I changed this to reference the .NET4 version: %windir%\Microsoft.NET\Framework\v4.0.30319\ilasm /nologo /quiet /dll %ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH% ...and everything works perfectly! HTH, Dave NB: Apologies if this appears twice - I sent it from a different account previously and don't think it made it through.

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Fwd: [ pythonnet-Patches-3044812 ] Add info parameter to the this.Bind() call
by Barton 19 Aug '10

19 Aug '10

-------- Original Message -------- Subject: [ pythonnet-Patches-3044812 ] Add info parameter to the this.Bind() call Date: Sat, 14 Aug 2010 09:01:07 +0000 From: SourceForge.net <noreply(a)sourceforge.net> To: noreply(a)sourceforge.net Patches item #3044812, was opened at 2010-08-14 02:01 Message generated for change (Tracker Item Submitted) made by barton_c You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=823893&aid=3044812&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: barton_c (barton_c) Assigned to: Nobody/Anonymous (nobody) Summary: Add info parameter to the this.Bind() call Initial Comment: I've added the info parameter to the call to the Binding binding = this.Bind(inst, args, kw, info) call to take advantage of Bind()'s ability to use a single MethodBase (CI or MI). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=823893&aid=3044812&group_…

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how can I build an assembly I can AddReference()?
by Brandon Craig Rhodes 17 Aug '10

17 Aug '10

I am interested in whether Python for .NET can help me provide third-party programmers with a way to write C# routines that will get called from my Python application. I was impressed earlier today with how easily Python for .NET compiled for Python 2.6 and the most recent Visual Studio release, so I set about trying to write a C# routine and call it from inside of Python. I have only gotten as far as trying to AddReference() my new DLL, but have not been able to get it to succeed. I first created a "Brandon.cs" file with this inside: ---------------------------------------- using System; using System.Reflection; [assembly:AssemblyVersion("1.0.0.0")] [assembly:AssemblyDescription("The Brandon library")] [assembly:AssemblyCompany("Rhodes Mill Studios, Inc.")] namespace Brandon { public static class BrandonClass { public static void Go() { Console.WriteLine("Hello, World!"); } } } ---------------------------------------- This was simple enough to compile with: csc /t:library Brandon.cs which produced a "Brandon.dll" file. Look at what happens if I then try importing that DLL from Python for .NET: >>> import clr >>> print clr.FindAssembly('Brandon') C:\Users\brandon\dev\pythonnet\Brandon.dll >>> clr.AddReference('Brandon') ... System.IO.FileNotFoundException: Unable to find assembly 'Brandon'. at Python.Runtime.CLRModule.AddReference(String name) in c:\Users\brandon\dev\pythonnet\src\runtime\moduleobject.cs:line 370 You can see that, oddly enough, Python can find the assembly, but cannot create a reference to it. This error message also results, by the way, if I compile "Brandon.cs" with a "/keyfile:..." option and run "gacutil /i Brandon.dll" before trying to run my Python code. I know that the step I am missing is probably blazingly obvious to those who have been using Windows longer, :-) but I will very much appreciate whomever who can point out what critical step I am missing in getting my Python code to call C# code. Other than this hangup, I'm impressed by how quickly Python for .NET got me up and running! -- Brandon Craig Rhodes brandon(a)rhodesmill.org http://rhodesmill.org/brandon

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embed Python in C#
by igorfier＠hotmail.com 16 Aug '10

16 Aug '10

Hello all, After following some examples around the web, and some discussions in the mail list, I came into the following snippet to call a function defined in a Python script into a C# host app, as seen at “http://mail.python.org/pipermail/pythondotnet/2007-June/000620.html”: // public static void MethodThatCallsPython() { // have to acquire the GIL to safely call back into Python!! IntPtr state = PythonEngine.AcquireLock(); PythonEngine.RunSimpleString("print 'hello'"); // done using python for now, so release the GIL... PythonEngine.ReleaseLock(state); } // Although it looks quite simple, VS2010 this throws an exception at the very first line of code: “Attempted to read or write protected memory. This is often an indication that other memory is corrupt.” My machine runs Windows 7 64-bit, and as I read somewhere else, 64 bit OS may be a matter of concern. Does anyone know how to overcome this annoying situation?? Thank you for any help provided! Igor Fier Dept. of Physics, Condensed Matter UNESP Rio Claro – Rio Claro-SP, Brazil

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Python.NET August 2010