Apply Value for Existing Block Attributes with Selection Window or Polyline Boundary

[jbrunkhorst]

I have a task where I need to apply 2 variables to thousands of blocks. These blocks live in a single .dwg and will have various irregular boundaries to help determine which variables to a certain grouping of blocks. These boundaries will be determined before running any potential LISP routine, but I am struggling to find a way to have a LISP routine either: A. Allow a user to select a closed polyine to select all blocks inside and define the attribute, or B. Allow a user to define a variable and then use a series of selection windows to define a certain attribute. I have found -attedit to update the attributes in the command line, but it will seemingly only wants to either update all blocks in the .dwg or wants the end user to select each attribute one by one. This command gives me hope for a future LISP routine development, but the selection process has me stumped right now.

[Sea-Haven]

In the simplest of terms, if you have a pline, you can get the vertices in a list, so then (ssget "WP" plist '((0 . "INSERT"))) you can add which blocks to look for also by name. So can process a selection of plines.