Autocad 2002 and DDE Topics

I have multiple session of AutoCad 2002 running and I have a VB app that I want to use to interact with a particular Acad session. Can this be done? The only DDE stuff I can find will work only if I have one session of AutoCad running ("AutoCAD.R15.DDE|system"). Is there a way to add more DDE topics to an AutoCad session other than just "system"?

 

Why do you need do DDE while a whole set of AutoCAD object model is
accessible easily through ActiveX Automation since R14.01? It is incredibly
easy to control AutoCAD through automation, using VB. I just wonder how many
programmers (especially VBers) still know what DDE is, or was.

want to use to interact with a particular Acad session. Can this be done?
The only DDE stuff I can find will work only if I have one session of
AutoCad running ("AutoCAD.R15.DDE|system"). Is there a way to add more DDE
topics to an AutoCad session other than just "system"?

 

Okay, then how do I accomplish what I need to accomplish using ActiveX Automation instead of DDE? I have one VB app and six sessions of Autocad running simultaneously. From the VB app I need to get the document object of drawing "ABC" that is open in Autocad session #3. How do I do this? If I use GetObject(,"Autocad.Application") I wil get the Application Object of the first session of Autocad I started. That's not the one I need. How do I specify which Application and Document object to get?

 

Try this:

Dim objAcad As AcadDocument
Set objAcad = GetObject("D:\PathToYourFile\ABC.dwg")

Automation instead of DDE? I have one VB app and six sessions of Autocad running
simultaneously. From the VB app I need to get the document object of drawing
"ABC" that is open in Autocad session #3. How do I do this? If I use
GetObject(,"Autocad.Application") I wil get the Application Object of the first
session of Autocad I started. That's not the one I need. How do I specify which
Application and Document object to get?

 

SDI=0 then you only have one instance of autocad.