How to Detect When a Specific DWG Template is Used

What would be a good way to mark a template DWT file so that a LISP program could easily detect it.

Say a user starts a new drawing from a template.

When the drawing is loaded the startup LISP (eg. in AcadDoc.lsp) runs and scans the drawing for something to indicate what template was used.

The LISP function could check for a particular text style or block but maybe there is a more elegant method than that???

 

I don't there's any way to do this from LISP, aside from
embedding something in the template files that can be
used to identify them.

ObjectARX provides a means to get the original filename
which for a new, unsaved drawing is the name of the
template that was used to create it.

 

I decided to put in a dummy block with a unique name. Part of the job of the startup LISP is to detect this block and if found to purge out all the unused blocks and linestyles - so the dummy block is deleted along with the rest.