 | | | Python SDK wierdness with importing Application object explicitly within mod | Python SDK wierdness with importing Application object explicitly within mod 2005-04-14 - By Bernard Lebel
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Hi Luke,<br>
<br>
Every python users have wondered the same thing at one point or
another.... here what Soft has to say about that (from Jerry Gamache):<br>
<br>
<br>
<br>
<pre wrap="">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.
</pre>
<br>
<br>
<br>
<br>
Luke Emrose wrote:
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I am about to go nutz on this....<br>
<br>
Before I whinge about the implementation of Python in XSI,<br>
maybe someone can tell me I am doing something stupid so I can fix this
issue once and for all.<br>
<br>
OK, I am modularising my code into python modules and recently
discovered that you can do the following from<br>
a module to import the normal Application and XSIFactory etc. objects
for use within that module :<br>
<br>
<i>import win32com<br>
ap = win32com.client.Dispatch( 'XSI.Application' ).Application<br>
XSIFactory = win32com.client.Dispatch( 'XSI.Factory' )<br>
XSIMath = win32com.client.Dispatch( 'XSI.Math' )<br>
from win32com.client import constants as c<br>
</i><br>
which is my typical set of imports at the start of all of my modules.<br>
<br>
(my previous solution, which worked flawlessly but is the most stupid
way EVER to have to do it, was passing in the Application<br>
object from the base script (as Application is defined and bound within
it by default) and then pass it on to every other module<br>
explicitly, which is only possible in Python via it's lack of
type-checking until run-time. However this is entirely different to
the way<br>
that every other supported scripting language within XSI does things,
as with them it is a lot easier to get hold of the Application object. )<br>
<br>
The stupid thing is now, despite this is the ONLY thing I have changed
in my code from before where Application<br>
was passed in explicitly, EVERY statement where I do an
object.Properties( "#some_property" ) call fails with<br>
the following error:<br>
<br>
for instance trying to get to the viewvis attribute:<br>
<br>
<i>File
"/usr/Softimage/XSI_4.2/Application/bin/win32com/client/__init__.py",
line 454, in __getattr__<br>
# raise AttributeError, "'%s' object has no attribute '%s'" %
(repr(self), attr)<br>
#AttributeError: '<win32com.gen_py.Softimage|XSI Object Model
Library v1.5.Property instance at 0x1669476908>' object has no
attribute 'viewvis'<br>
# - [line 453]<br>
#ERROR : OLE error 0x80020101</i><br>
<br>
Wrapping up the Properties call like this ap.GetValue(
object.Properties( "#some_property" ) ) helps in some situation, but
even then there are a lot of<br>
cases where it still fails. Since the ONLY thing I changed in my code
is the way I am importing Application, things like this should not stop
working.<br>
<br>
If I've done something obviously wrong could people please let me know,
or is there something else I am missing.<br>
<br>
Sorry bout the longwindedness but I'm trying to be as clear as possible
here.<br>
<br>
cheers,<br>
<br>
Luke<br>
<pre class="moz-signature" cols="72">--
luke emrose
vfx artist - <a class="moz-txt-link-abbreviated"
href="mailto:luke@(protected)">luke@(protected)</a>
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href="http://www.rsp.com.au">www.rsp.com.au</a>
redefining visual effects delivery
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mb - 0408 893 505
adl - ph +61 8 7421 6400 - fx +61 8 7421 6401
syd - ph +61 2 9338 6400 - fx +61 2 9338 6401
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rising sun research - <a class="moz-txt-link-freetext"
href="http://research.rsp.com.au">http://research.rsp.com.au</a>
cineSpace color management solutions for film
</pre>
</blockquote>
<br>
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