Posted by Rallaz on Dec 20, 2012; 11:24am
URL: https://forum.librecad.org/How-could-I-fetch-the-block-and-entity-information-tp5707314p5707315.html

First, read my comment:
http://forum.librecad.org/Block-can-not-be-inserted-on-different-layers-td5544026.html#a5544807

If you want to write a plugin, you can modify a bit "list plugin" and you have what you need.