[python-win32] Access to .NET components from Python (Was: Win32 COM starter book)

[Mark Hammond]

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> Compile with csc /target:library MyAssembly.cs, register with
> regasm MyAssembly.dll /tlb:MyAssembly.tlb, and try to test it. Nope,
> OLE error 0x80131522. Google tells me that this means I need my
> assembly in the same directory as the executable! (That's Python, not
> the script - so definitely not where I'd like to put my random DLLs).

Yeah, this is .NET for you.  If you want it publically available, you must
create a strongly named assembly and stick it in the GAC.  There are 2
choices - very public or very private.  However, the "very public" isn't as
bad as it sounds - you are guaranteed to get the *except* object you
compiled against, regardless of naming clashes, etc.

> OK, copy the thing there for now.
> 
> >>> from win32com.client import Dispatch
> >>> net = Dispatch("CTest")
> >>> net.Test()
> Hola Mundo!
> What is your name:
> kjhas
> Buenos Dias, kjhas!
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: 'NoneType' object is not callable
> 
> Pretty good - it works. But what is the TypeError at the bottom? My C#
> code has finished OK. Is it something "on the way back" from .NET to
> Python?

Yep - we are seeing a VB friendly implementation - thus "net.Test" is
actually making the call (even though it looks like a property reference!)
This function returns None, and we are trying to call it.

Use EnsureDispatch() or makepy manually to get it working.

Mark.

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