Valued Contributor
Posts: 56
Registered: ‎12-06-2006
Message 1 of 3 (196 Views)

Problem with "Extension of an plugin"

196 Views, 2 Replies
05-05-2013 05:36 PM


I have a finished plugin (dll-A), which works well.
Now I want to write an extension for it (dll B).
The function in the expansion are so special that I do not in
want to integrate the finished plugin (dll A).
I bind the dll to the plugin (dll-A) into the new dll of the plugin (dll B) and inherit the plugin class (class A) in the plugin class (class B).
Is loaded by the netload (dll B).
He throws the following error:


   Autodesk.AutoCAD.Runtime.Exception: eDuplicateKey
   bei Autodesk.AutoCAD.Runtime.Interop.Check(Int32 returnValue)
   bei Autodesk.AutoCAD.Runtime.CommandClass.AddCommand(ICommandLineCallable ca, MethodInfo mi)
   bei Autodesk.AutoCAD.ApplicationServices.AutoCADApplicationHolder.Initialize(Assembly assembly)
   bei Autodesk.AutoCAD.ApplicationServices.ExtensionLoader.ProcessAssembly(Assembly assembly)

Exist in both dll's no duplicate commands!
On debugging looks as if autocad load first dll-A and than load dll-B.

Can it be that the (dll-A) is loaded twice?
If so how can I overcome this?

regards Mario

ADN Support Specialist
Posts: 352
Registered: ‎07-24-2007
Message 2 of 3 (152 Views)

Re: Problem with "Extension of an plugin"

05-09-2013 09:14 AM in reply to: mario.rosenbohm

We need a build able sample to look at really. Do youuse the CommandClass attribute in both?

Fenton Webb

Developer Technical Services

Autodesk Developer Network

Valued Contributor
Posts: 56
Registered: ‎12-06-2006
Message 3 of 3 (126 Views)

Re: Problem with "Extension of an plugin"

05-15-2013 10:19 AM in reply to: fenton.webb



excuse me, we spend a few days on holiday.


... yes both dll's (A, B) use the CommandClass attribute.


I have found an Solution for me (parallel post on "TheSwamp")

... AutoCAD loaded all linked Dll's from the dll-B on netload-command.
But the dll-A is also a plugin-dll (has the pluginclass-A), hence loaded autocad the implement commands
from pluginclass-A.
All command of the pluginclass-A from dll-a is inherit in pluginclass-B in dll-B.
Therefor crasht the Commandloader on load plginclass-B.

I have solved the problem by extract all functionality that use the pluginclass-B from pluginclass-A into
new class without Commands. That works fine.

Have your another solution? It's interest me for future projects.


regards Mario


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