A C3D or Acad dwg ?

[dnl999]

Is there a way to determine whether a drawing just opened is an AutoCAD dwg or Civil 3D dwg ?

Keep in mind that a Civil 3D dwg can be a dwt without any objects.

Thanks in advance for your reply.

[dnl999]

We just don't want anyone to open a C3D dwg file in AutoCAD and save and vice versa.

[Anonymous · Accepted solution]

Hi there,

check the “named object dictionary” in the database and look to see if contains an object named “Root”. Civil 3D creates that object when initializes a drawing, and at a very low-level, it is the entry point to all Civil objects (not that you want to use that stuff directly)

For more details see this Blog post by my colleague Isaac -

http://civilizeddevelopment.typepad.com/civilized-development/2011/07/is-my-drawing-a-civil-3d-drawi...

Hope this helps!

Thanks,