How get OST (Built-In Name) of element

How get OST category name of element?

for examle we are have selected pipe in Revit to IN[0]

ostcategory=GetOST( IN[0] ) ??

And we get this:
OUT=ostcategory

OST_PipeCurves

Revit Category Guide.xlsx (368.6 KB)

I use this spreadsheet which lists the OST Revit Categories.

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@Claus thanks, but im want to get Built-In Name (AsString) of element in Dynamo )

Hi @til.shviger

Are you looking for this?

@Kulkul
YES!
can you show what is inside the script?

Sure!

import clr, System
clr.AddReference("RevitNodes")
import Revit
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference("RevitServices")
from RevitServices.Persistence import DocumentManager
doc = DocumentManager.Instance.CurrentDBDocument
 
catname = IN[0]
bic = System.Enum.GetValues(BuiltInCategory) 
cats, bics = [], []
for i in bic:
    try:
        cat = Revit.Elements.Category.ById(ElementId(i).IntegerValue)
        cats.append(cat)
        bics.append(i)
    except:
        pass
 
for i, b in zip(cats, bics):
    if catname == str(i): 
        ost = b 
 
OUT = ost
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@Kulkul

everything works perfect! :ok_hand:

Thank you!

@til.shviger You’re welcome!

Merry Christmas :christmas_tree: and happy holidays :slight_smile: . Cheers!

Merry Christmas ! :sparkler: I Wish you happiness and success at work in the New Year :hugs:

I tried this just now and got the following error:

Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed. 
Traceback (most recent call last):
  File "<string>", line 25, in <module>
NameError: name 'ost' is not defined

so basically the variable to get the resulting category is not working for me. The end game for me is to get a handle on Revit Links and extract information from linked RVT documents. Found the category:

Autodesk.Revit.DB.BuiltInCategory.OST_RvtLinks

but not sure how to access the elements with this built-in category.
Thoughts?

If you are like me and must know the details to remember something here is a nugget for you.

Built-in Category OST Prefix - What does it stand for

Almost all the built-in category enum values come equipped with an “OST_” prefix.
OST_ it is short for “O” bject “ST” yle.

Credit: Jeremy Tammik + arnostlobel

2 Likes

Hi @Kulkul,
I’m trying to understand your script line by line (novice), and can’t work out the ById() part. Where does it come from? I can’t seem to find it in the API documentation, or in Dynamo (although most of that path is there).
I can make it work, but I don’t understand it at all! Any help most appreciated!

Please convert Catname ToString

if catname.ToString() == i:

# by Alexander Berg | 2020-03-07 | Automated Design Solutions

import clr, System
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

OUT = [i for i in System.Enum.GetValues(BuiltInCategory) if str(i) == "OST_"+IN[0]]
1 Like

This guide is so helpful, thanks for sharing

Does OST refers to object style type?

Hi,
Do you know what’s the correct Python syntax for the following C# line?
I’m having trouble matching the Id value to the string OST_Rooms.

if ( (BuiltInCategory)element.Category.Id.IntegerValue == BuiltInCategory.OST_Rooms)
{
...
}

Thanks

hello you can try this
if element.Category.Id.IntegerValue.ToString() == BuiltInCategory.OST_Rooms.value__.ToString() :

1 Like

Perfect, thanks!
Can you explain a bit where the .value__ parameter comes from?

value__ is a property (getter) to get the constant value (integer) of the enumeration, another way is to get the enumeration type and then convert it

2 Likes