Topic: ObjectID - lifetime ?

[rogue]

I've always used handles. The help file states that handles are always constant through the lifetime of the drawing - the inference being that ObjectID's are not ...

But, to use fields, I need to use the ObjectID's. When could one reasonably expect an ObjectID to change? if it does change, how do you find the original entity that was referenced in the field?

TIA ....

[Keith™]

Handles can and do change with the WBLOCK command. It is my understanding that the ObjectID can change.

[It's Alive!]

...When could one reasonably expect an ObjectID to change?...

Each object in a database is assigned a new ObjectId on opening. The Ids do not change while the database is open.
They are unique across all open databases.

As you have already discovered handles are always constant, but are not guaranteed to be unique across multiple databases.

...But, to use fields, I need to use the ObjectID's....

Why? Since the Field object is derived from DBobject, it should have both a handle and ObjectId property to party with