Mailman 3 January 2005 - Python.NET

managed exception stack trace.
by Stan Pinte 08 Feb '05

08 Feb '05

hello, I am using pythonNet with a great pleasure, thanks a lot for that piece of work. IMHO, a wiki would be very very useful for this project, as I would be ready to contribute... One question: How do I print out managed exceptions full stack trace? thanks, Stan.

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calling methods from Zope
by bksasha＠zahav.net.il 24 Jan '05

24 Jan '05

Hi I am trying to use Python Net with Zope. I successfully compiled Zope for Python 2.4. The strange issue I am facing is that when I use Python interpreter or run scripts from command prompt everything works fine, but when I use external methods from Zope I cant call any method on CLR objects. Properties, constructors work fine, but calling any method (even void without parameters) hangs the system. What can be the reason? Thanks Alexander

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calling methods from Zope
by bksasha＠zahav.net.il 24 Jan '05

24 Jan '05

Hi I am trying to use Python Net with Zope. I successfully compiled Zope for Python 2.4. The strange issue I am facing is that when I use Python interpreter or run scripts from command prompt everything works fine, but when I use external methods from Zope I cant call any method on CLR objects. Properties, constructors work fine, but calling any method (even void without parameters) hangs the system. What can be the reason? Thanks Alexander

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Problem when chaining script calls through CLR classes
by Chris Faulhaber 20 Jan '05

20 Jan '05

Hi folks, I've run across what I think may be a bug when I chain a script call through my own application. I'm using 1.0-beta4 on Windows XP with an installation of Python 2.4. The sequence I use to reproduce the problem is fairly simple: 1) Execute some Python code either through PyObject.InvokeMethod, or PythonEngine.RunSimpleString. 2) From the executed Python code, call into a CLR class. 3) From the CLR class, execute Python code again. When this happens, I get a NullReferenceException with this stack trace: at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, IntPtr kw) at Python.Runtime.PyObject.Invoke(PyObject[] args) at Python.Runtime.PyObject.InvokeMethod(String name, PyObject[] args) at <line in my code that made the second call into Python code> Here is some example code that demonstrates the issue: using System; using Python.Runtime; namespace PDNBug { public class Example { [STAThread] static void Main(string[] args) { PythonEngine.Initialize(); PythonEngine.RunSimpleString("from CLR.PDNBug import Example\nExample.FirstCall()"); } public static void FirstCall () { Console.WriteLine("First call succeeded."); PythonEngine.RunSimpleString("from CLR.PDNBug import Example\nExample.SecondCall()"); } public static void SecondCall () { Console.WriteLine("Second call succeeded."); } } } Note that this example uses RunSimpleString to demonstrate the effect, but the above stack trace came from some more complex code that primarily uses code objects generated through Python compile(). When the example code is executed, I receive the following output: First call succeeded. Traceback (most recent call last): File "<string>", line 2, in ? <CLR.System.NullReferenceException object at 0x02DC6F50>: Object reference not set to an instance of an object. So is this issue a bug, or should I simply not be doing what I'm doing? Regards, Chris Faulhaber

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example of calling Python from C# with simple object
by bhanu.nukala 19 Jan '05

19 Jan '05

hai MBarclay, I am Bhanu Prakash from Pune, India. I am working as a trainee software engineer. I am currently working on python and c#.can you find me more help on python and c#. can you find some tutors on how to implement python in C# and how to implement C# in python. I saw some links like example of calling python from c# etc...In that your examples are very good but for a fresher candidate that is difficult to understand. So please send some more details on python and c#. In your examples your used invoke method. What is the purpose of that function and in which cases the function is able to use. Tell me the functions and description of that functions which are useful in python and c# Ok I am waiting for your reply With regards Bhanu Prakash Nukala, Neilsoft Limited, <mailto:bhanu.nukala@neilsoft.com> mailto:bhanu.nukala@neilsoft.com Phone : 91-20-24464455/66/77 Extn:282 Mobile #:9850757838

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[PythonNet] 2/ 2 Resolve "Float ValueError in different regional settings (Windows XP)"
by Collector: Python for .NET Issue ... 17 Jan '05

17 Jan '05

Issue #2 Update (Resolve) "Float ValueError in different regional settings (Windows XP)" Status Resolved, Testing/bug medium To followup, visit: http://zope.org/Members/Brian/PythonNet/Collector/2 ============================================================== = Resolve - Entry #2 by Brian on Jan 17, 2005 4:01 pm Status: Pending => Resolved This is fixed for the next release. Thanks for the report! --Brian ________________________________________ = Request - Entry #1 by Anonymous User on Dec 15, 2004 2:51 am started runtests.py some test fail with a message like: ERROR: Test single fields. ---------------------------------------------------------------------- Traceback (most recent call last): File "D:\Downloads\python\PythonNet-1.0-beta4\PythonNet-1.0-beta4\tests\python \test_field.py", line 363, in testSingleField self.failUnless(object.SingleField == 1.1) ValueError: invalid literal for float(): 1,1 The regional settings (German): decimal symbol: , digit grouping symbol: . ==============================================================

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Calling C# from Python 2.3
by Amod Kulkarni 04 Jan '05

04 Jan '05

Hi, I know PythonNet has been specially designed to handle .NET/CLR compatibility but because of some other restrictions I want to use Python 2.3 to access a C# function. First of all is it possible? I am trying with following piece of code in C# (Server app) and python (client app). This is a class library in C# which is compiled and registered with following commands. csc /target:library Class1.cs regasm Try2005.dll /tlb:Try2005.tlb using System; using System.Runtime.InteropServices; namespace Try2005 { public class TestingCSBC { [Guid("1EB394AB-2D4A-4a52-9F22-E8ACAED4800F")] public interface IManagedInterface { int PrintHi(string name); } [Guid("2FD76301-489A-4dc3-BF6B-5DF6FCE96CB8")] public class InterfaceImplementation : IManagedInterface { public int PrintHi(string name) { Console.WriteLine("Hello, {0}!", name); //TestCSBCClass obj = new TESTDLLCOMLib.TestCSBCClass(); //obj.Displaymessage("In C# application!!"); return 33; } } } } Python code: import win32com.client try: serverObj = win32com.client.Dispatch("Try2005.TestingCSBC") except Exception,e: print "Dispatch error",e try: serverObj.PrintHi("But will it work on Tribon??") except Exception,e: print "Error while Calling C# function",e After running the above Py script I am getting following error output. Dispatch error (-2147024894, 'The system cannot find the file specified.', None, None) Error while Calling C# function name 'serverObj' is not defined Any pointers would be greatly appreciated. Thanks in advance.

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