Confusion using set_int_display with user enumerations

[b-irb]

Hello, I am trying to automate the process of identifying structures then retyping the associated fields. I have been able to retype the necessary variables into a structure but I want to change the display type for a specific field. This field is a bitflag whose values are defined in an enumeration -- left as an integer it is tricky to immediately see what is being set.

I have written the following in the Binja console:

inst.function.source_function.set_int_display_type(
  inst.address,
  2,
  IntegerDisplayType.EnumerationDisplayType, bv.get_type_id("MyEnum")
)

Which is supposed to change the display type of an MLIL instruction (where flags is a uint32_t):

var.flags = 0x42000000

into types defined by MyEnum:

enum MyEnum : uint32_t
{
    DOG = 0x800000,
    CAT = 0x2000000,
    BAT = 0x4000000,
    RAT = 0x10000000,
    BUG = 0x20000000,
    MAN = 0x40000000
};

If I were to assign the field type to MyEnum in the struct, Binja does not display the value as a combination of enum values so I need to manually configure the display. However, (despite MyEnum being defined) the code fails due to the type_id missing:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Applications/Binary Ninja.app/Contents/MacOS/plugins/../../Resources/python/binaryninja/function.py", line 2625, in set_int_display_type
    display_type = IntegerDisplayType[display_type]
  File "/Applications/Binary Ninja.app/Contents/Resources/bundled-python3/lib/python310.zip/enum.py", line 440, in __getitem__
    return cls._member_map_[name]
KeyError: 'd9a0799d-d5db-483d-8f1f-b92b63976ff8'

I'm not sure how to correctly determine the type_id, any guidance would be appreciated. Additionally, what is the overhead associated by changing the display type on potentially thousands of instances? Is this trivial overhead or potentially cause problems? Thanks.

[emesare]

Apoligies for the delayed reply, we have had our heads down releasing Binary Ninja 5.2 for the past few weeks.

You can retrieve the type id like so:

>>> current_view.get_type_by_name('MyEnum').registered_name.type_id
'3fc496d9-f8a4-4ab5-a4ac-695cf24e4dfb' # Will differ for you

Example:

Screen.Recording.2025-11-20.at.7.21.01.PM.mov

target_typeid = current_view.get_type_by_name('RenderOptions').registered_name.type_id
target_address = 0x140002351
current_function.set_int_display_type(target_address, 0x155, 0xffffffff, IntegerDisplayType.EnumerationDisplayType, enum_display_typeid=target_typeid)