Mailman 3 এপ্রিল 2004 - Python.NET

Python.NET and COM CoClasses
by Bruce Dodson 29 এপ্রিল, 2004

29 এপ্রিল, 2004

I tried to use Python.NET with COM objects, and I couldn't get it to work. The documentation says it works, so I assume either that there is a bug or that I'm doing something wrong. Background: I have a large COM library of vtbl-based interfaces, not accessible through Win32all. They can be accessed through ctypes but it's slow and there are a many cases where the autogenerated wrappers are wrong. This library ships with .NET assemblies which properly deal with those special cases, so that's why I'm interested in Python.NET. What happens is I can import the interfaces, and I can import the CoClasses, but Python.NET seems to think the CoClasses are interfaces too. So when I try to instantiate an object, it fails with a message "interface constructor requires a single argument" or something like that. Any ideas? Bruce

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AxHost & IDispatch
by Andre Van Der Merwe 26 এপ্রিল, 2004

26 এপ্রিল, 2004

Hi all, I've got a python script that I want to create a C# GUI for. I'd like to have a web browser control on the form that I can control from python. This is not too difficult - just drop a WebBrowser control on the form and create a public property to expose the control. The problem is that .net is wrapping the control (AxHost etc) and not all the methods are exposed (e.g. Document.all.tags does not work...) Can I get the control's IDispatch and use late-binding? If so how???? If I cant can I create the activex control from python and 'place' it on a specific form (given a HWND)? Any examples of manually creating and placing a activeX control? Thanks for any advice. Andre

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How do you use PythonNET in a Zope Environment?
by Andy Shah 19 এপ্রিল, 2004

19 এপ্রিল, 2004

How does one use PythonNET in a Zope Environment to access .NET libraries... Can we also use pre-created .NET libraries, which inturn access database servers, the results of which can be shown via ZPT? Kind Regards, Anand.

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Network Install - Update
by Brian Almond 19 এপ্রিল, 2004

19 এপ্রিল, 2004

More data: If I'm running Python from a Novell network share volume (that is, no local Python install) and try running a Python.NET script, I receive: Unhandled Exception: System.Security.Policy.PolicyException: Required permissions cannot be acquired. at CLRModule.initCLR() The script I'm running is simply a single line, "import CLR". Any tips from the .NET savvy programmers on the list? (Aside from: "Don't do that." ;) Additionally, I'm having trouble getting McMillan's installer to behave with the CLR imports. Is this something that may get resolved in the next beta? I've seen mention of switching to using the official import hooks in the TODO file in CVS. This sounds like something promising. TIA - It's really remarkable how well Python.NET works, and how simple it is to take C# code and convert it.

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Network install
by Brian Almond 16 এপ্রিল, 2004

16 এপ্রিল, 2004

A new puzzle: Today I tried a Python.NET app on a machine that was accessing a Python installed on a network share. I had moved the CLR.dll & Python.Runtime.dll into the same place that I have them on my workstation's Python install. I ended up getting an error every time I tried to import the CLR module. For kicks, I copied all of the Python.NET files to a network folder and tried using it (in this case, simply trying to run python.exe), and I receive: Unhandled Exception: System.Security.Policy.PolicyException: Required permissions cannot be acquired. at PythonConsole.Main(String[] args) Any idea on why Python for .NET would get frisky on a Novell share? Help me out here, I suspect I'm overlooking something super obvious...it's been a long week! -BA

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CLR + wxPython + OLE initialization
by Brian Almond 10 এপ্রিল, 2004

10 এপ্রিল, 2004

Today I found that in my wxPython apps, adding a CLR import at the top of the files causes wxPython's mainloop to generate a warning message box which reads "Could not initialize OLE". Otherwise, the application seemed functional. I experimented with it, and it seems that delaying CLR-related imports until after the wx Mainloop has started does the trick. Here's a tiny wxPython app that demonstrates the error: import wx #import CLR class MyApp(wx.App): def OnInit(self): # global CLR # import CLR self.frame = wx.Frame(None, -1, 'Test Window') self.frame.Show(True) return True app = MyApp(0) app.MainLoop() If you uncomment the first comment, the application window will open, and an OleInitialize failure message will pop up. If you instead uncomment the second two comments, the application window will open without error. (Note: this was with the latest wxPython build, 2.5.1.5 - I assume similar failures occur with older builds.) It's not a big deal to move the imports, but it's a little unnatural to me. Is this something that's broken in Python for .NET, or .NET, or... Here's a possibly related message I found on wx-users: http://lists.wxwidgets.org/archive/wx-users/msg30069.html

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