How to read values from Structure definition?

I’m trying to find a way to read the Structure definition of a type Element, for example WallType.
The structure contains different layers, and for example I would like to read the Material for each layer.

I can find the Structure parameter using this code:

type_collector = FilteredElementCollector(doc).OfCategory(category).WhereElementIsElementType().ToElements() 
for type in type_collector:
     for para in type.GetOrderedParameters():
         if para.Definition.Name == "Structure":

But now I’m having issues finding how to access the values within Structure. It doesn’t seem to be a Value, so I’m wondering if there is some method to extract the data within Structure?
Regards, Gustav

Welcome @guser40

layers = wall.GetCompoundStructure().GetLayers()
    for layer in layers:
        fonction = layer.Function
        width = layer.Width*25.4*12 #should be using UnitUtils to convert from decimal feet to mm or other units
        material = doc.GetElement(layer.MaterialId).Name
        print("- {}mm - {} - {}\n".format(width, fonction, material))

Hello Jean-Marc, thank you for the answer!
It seems that Walls does not have a GetCompoundStructure method.

This is the code I tried using:

walls = FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Walls).WhereElementIsElementType().ToElements()
for wall in walls:
    layers = wall.GetCompoundStructure().GetLayers()
    for layer in layers:
        material = doc.GetElement(layer.MaterialId).Name

I get the error AttributeError : ‘NoneType’ object has no attribute ‘GetLayers’
Could you advice on what I am doing wrong?

probably a curtain wall.
catch the error with a try/except

There should be no Curtain walls in the scene.
Can I print the type name when I catch an error? There doesn’t seem to be a Name member for WallType.

There is always a curtain wall type in any Revit project file, you cannot delete the last one
print the element Id and then select by id in revit to have a look at it

There is also a default stacked wall. Check the Kind property of the WallType you are processing:
It should be WallKind.Basic

I see, that is good information to know, I’ll be careful with what information I gather.
I didn’t get wall.Kind to work, as it returned and and not WallKind.Basic, perhaps there’s a conversion to do there?
However, I got it working by sorting out the actual geometry wall elements instead, and then checking there type.
This is the code I used in the end:

dict = dict()
doc = __revit__.ActiveUIDocument.Document
walls = FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Walls).WhereElementIsNotElementType().ToElements()
for wall in walls:
    #print(wall.Name, "has the materials:")
    wall_type = doc.GetElement(wall.GetTypeId())
    layers = wall_type.GetCompoundStructure().GetLayers()
    dict[wall.Name] = layers
    for layer in layers:
        material = doc.GetElement(layer.MaterialId).Name
for key in dict:
    print(key, "has the materials:")
    for layer in dict[key]:
        material = doc.GetElement(layer.MaterialId).Name

Thank you so much for the help. wall_type.GetCompoundStructure().GetLayers() was the code method I was looking for!
Regards, Gustav