 | | | avoiding using get value with python | avoiding using get value with python 2005-03-25 - By Bernard Lebel
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Thanks a bunch Jerry for this precious info. Hope it gets put in the skd
docs :-)
Bernard
Jerry Gamache wrote:
> XSI sometimes return objects with an incorrectly set (as per PythonWin
standards) multi-dispatch interface.
>
> The way to work around that is to re-wrap the object in a dynamic dispatch.
This allows you to skip the Application.GetValue:
>
> def dispFix( badDispatch ):
> import win32com.client.dynamic
> # Re-Wraps a bad dispatch into a working one:
> return win32com.client.dynamic.Dispatch(badDispatch)
>
> # Let's see if this works:
> Application.CreatePrim("Sphere", "MeshSurface", "", "")
> Application.ApplyHairOp("sphere", "")
> oHair = Application.GetValue("hair").ActivePrimitive.ConstructionHistory.Find
("HairGenOp")
> try:
> Application.LogMessage(oHair.Parameters['EmitterMeshSubdlevel'].Value)
> except:
> Application.LogMessage("Incorrect dispatch pointer")
> oHair = dispFix(oHair)
> Application.LogMessage(oHair.Parameters['EmitterMeshSubdlevel'].Value)
>
> # or, as a single long line:
>
> dispFix(Application.GetValue("hair")
> .ActivePrimitive.ConstructionHistory
> .Find("HairGenOp")
> ).Parameters['EmitterMeshSubdlevel'].Value = 1
>
> If that really really annoys you and you don't want to dispFix at all, there
is a way to make sure everything works, but you need to modify a Python file to
always return dynamic dispatches:
>
> Change %PYTHONPATH%\Lib\site-packages\win32com\client\__init__.py
>
> Look for the function called __WrapDispatch
>
> And comment all lines except the last one that begins with "return dynamic
.Dispatch( ... "
>
> Of course it is always a good idea to backup files you are about to modify.
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