Saturday snippet: Using the connection stack to find all expressions driven by a given parameter

# Softimage 2013 SP1 Python snippet
from sipyutils import si			# win32com.client.Dispatch('XSI.Application')
from sipyutils import siut		# win32com.client.Dispatch('XSI.Utils')
from sipyutils import siui		# win32com.client.Dispatch('XSI.UIToolkit')
from sipyutils import simath	# win32com.client.Dispatch('XSI.Math')
from sipyutils import log		# LogMessage
from sipyutils import disp		# win32com.client.Dispatch
from sipyutils import C			# win32com.client.constants

from xml.etree import ElementTree as ET

def getExpressionsDrivenByLocalParameter( obj, param="posx" ):
	stack = siut.DataRepository.GetConnectionStackInfo( obj.Parameters(param) )
#	print stack

	expressions = XSIFactory.CreateObject("XSI.Collection")
	expressions.Unique = True
	xmlRoot = ET.fromstring(stack)
	for xmlCnx in xmlRoot.findall('connection'):
		if xmlCnx.find('type').text == 'out' and xmlCnx.find('localparameter') is not None and xmlCnx.find('localparameter').text == param:
			item = xmlCnx.find('object').text
			if item.endswith('.Expression'):

	return expressions

# Create an expression where the Scene Material diffuse red drives the diffuse red of a Lambert shader
Application.SetExpr("", "") 

x = getExpressionsDrivenByLocalParameter( si.Dictionary.GetObject("Sources.Materials.DefaultLib.Scene_Material.Phong.diffuse"), param="red" )
log( x )
# INFO :

Reference and credits: