Mailman 3 April 2005 - Python.NET

ANNOUNCE: Python for .NET beta 5 now available
by Brian Lloyd June 2, 2005

June 2, 2005

Python for .NET 1.0 beta 5 is now available - you can download it from: http://www.zope.org/Members/Brian/PythonNet/ Python for .NET is a near-seamless integration of Python with the .NET common language runtime. For more details, see the README: http://www.zope.org/Members/Brian/PythonNet/README.html The beta 5 release features a refactoring of thread management support, making the runtime stable for multi-threaded applications, as well as several improvements and bug-fixes. Special thanks to all who sent in thread-related scenarios and test cases! I have tried to incorporate as many of these as possible into the unit tests - if you still have problems that you suspect may be related to threading or interpreter lock issues, please let me know asap. There is also now a mailing list for discussion, questions and issues related to Python for .NET at: pythondotnet(a)python.org. To subscribe to the mailing list or read the online archives, see: http://mail.python.org/mailman/listinfo/pythondotnet Brian Lloyd brian(a)zope.com V.P. Engineering 540.361.1716 Zope Corporation http://www.zope.com

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PythonNET and large WinForms applications..
by Jim Hargrave April 14, 2005

April 14, 2005

I just discovered PythonNET and it's a wonderful solution. I can now call .NET and Java (via Jpype) code from the same Python script :-) I'm considering replacing wxPython with PythonNET+WinForms for all our GUIs. Is anyone else doing this for large apps? Do you consider PythonNet ready for developing feature rich user interfaces with WinForms? regards J ------------------------------------------------------------------------------ This message may contain confidential information, and is intended only for the use of the individual(s) to whom it is addressed. ------------------------------------------------------------------------------

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How to get 'None' from .NET?
by Boris Capitanu April 14, 2005

April 14, 2005

Hello, I'm trying to call from .NET some function defined in a Python script, and pass 'null' as one of the parameters of the function in certain situations. I was expecting that the bridge would map the 'null' in .NET to 'None' in Python, however I receive an exception in .NET when I execute the code. I have something like the following: -------------- 1. PyObject module = PythonEngine.ImportModule("script") 2. PyObject func = module.GetAttr("someFunction") 3. object aNullObject = null 4. PyObject[] arguments = new PyObject[2] 5. arguments[0] = PyObject.FromManagedObject("a string") 6. arguments[1] = PyObject.FromManagedObject(aNullObject) // I also tried: arguments[1] = null directly 8. func.Invoke(arguments) -------------------- When executed, line 6 throws a NullReferenceException if I use 'arguments[1] = null' instead of line 6, I get a NullReferenceException in line 8. How can I pass 'null' to a script? Thank you. Boris __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/

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ActivePython 2.4.1.245 problem
by Boris Capitanu April 14, 2005

April 14, 2005

Hi, I just upgraded my Python to ActiveState's 2.4.1 version and some thing apparently broke in the bridge. Here are some things I was able to do in version 2.4.0 that now no longer work: C:\Python24>python ActivePython 2.4.1 Build 245 (ActiveState Corp.) based on Python 2.4.1 (#65, Mar 30 2005, 09:33:37) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR >>> from CLR.System.Reflection import Assembly Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: __import__ not found >>> ------------- C:\Python24>python ActivePython 2.4.1 Build 245 (ActiveState Corp.) based on Python 2.4.1 (#65, Mar 30 2005, 09:33:37) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR >>> import CLR Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: __import__ not found >>> >>> import os Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: __import__ not found >>> ---------------- It looks that after you first "import CLR" something gets screwed up inside CPython's tables because it can't find any imports anymore. Anyone else have the same problem? Boris __________________________________ Do you Yahoo!? Make Yahoo! your home page http://www.yahoo.com/r/hs

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Remoting
by apocalypznow April 13, 2005

April 13, 2005

Has anyone tried to do dotNet Remoting with PythonNet? Can someone post a code sample?

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how to implement Implements in py4.net
by Guy Robinson April 10, 2005

April 10, 2005

Hello, I have an example VB.NET script (see below) that I'm trying to recreate using python for .NET. How do I implement the Implements function? Any help appreciated. Regards, Guy """ Public Class Command Implements company.program.IExternalComm Public Function Execute(ByVal application As company.program.Application, ByRef mesge As String, ByVal ds As company.program.dataSet) As company.program.IExternalComm.Result Implements company.program.IExternalComm.Execute MsgBox("Hello World") Return company.program.IExternalComm.Result.Succeeded End Function End Class """

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Runs OK on Linux with Mono
by Louis Helm March 31, 2005

March 31, 2005

Noticed you successfully installed Python for .NET on Linux. How did you build the CLR? I have VS.NET for windows but it only builds .dll class libraries. Building Python for .NET under mono fails. Cheers, Louie

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[PythonNet] 5/ 2 Resolve "Strange errors"
by Collector: Python for .NET Issue ... March 31, 2005

March 31, 2005

Issue #5 Update (Resolve) "Strange errors" Status Resolved, General/bug medium To followup, visit: http://www.zope.org/Members/Brian/PythonNet/Collector/5 ============================================================== = Resolve - Entry #2 by Brian on Mar 31, 2005 10:19 pm Status: Pending => Resolved This is fixed for b6 - due to an ill-advised decref of globals that only happens when the CLR module is imported into an existing Python interpreter... -BL ________________________________________ = Request - Entry #1 by Anonymous User on Mar 1, 2005 5:35 pm There seems to be some sort of strange crash occurring when importing CLR in the interactive prompt. It doesn't occur when executing a script from a file or in shells like PyCrust. Also, it does not happen at all in Python 2.3/PythonNET beta 3. Importing CLR seems to wreak havoc with the interpreter: Python 2.4 (#60, Nov 30 2004, 11:49:19) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR >>> print dir() Traceback (most recent call last): File "<stdin>", line 1, in ? NameError: name 'dir' is not defined >>> print dir(__import__) Traceback (most recent call last): File "<stdin>", line 1, in ? NameError: name 'dir' is not defined >>> print __import__ Traceback (most recent call last): File "<stdin>", line 1, in ? NameError: name '__import__' is not defined >>> __import__ Fatal Python error: GC object already tracked This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Keeping a reference to globals() seems to suppress it: D:\Python24>python.exe Python 2.4 (#60, Nov 30 2004, 11:49:19) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> a=globals() >>> import CLR >>> dir() ['CLR', '__builtins__', '__doc__', '__name__', 'a'] >>> __import__ <built-in function __import__> ==============================================================

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[PythonNet] 3/ 3 Resolve "Python strings should convert to byte[]"
by Collector: Python for .NET Issue ... March 31, 2005

March 31, 2005

Issue #3 Update (Resolve) "Python strings should convert to byte[]" Status Resolved, General/bug medium To followup, visit: http://www.zope.org/Members/Brian/PythonNet/Collector/3 ============================================================== = Resolve - Entry #3 by Brian on Mar 31, 2005 10:16 pm Status: Accepted => Resolved oops - meant to resolve ________________________________________ = Comment - Entry #2 by Brian on Mar 31, 2005 10:06 pm done for beta 6. -BL ________________________________________ = Request - Entry #1 by Brian on Feb 8, 2005 10:55 am Status: Pending => Accepted Supporters added: Brian It should be possible to convert a string or sequence of single-character strings to a byte array. Not sure if its too DWIM-my to do the same for unicode strings... ==============================================================

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