Multithreaded app - no access to acad objects

[dahovey]

I'm trying to use a multithreaded app and the second thread cannot access any other the autocad objects...such as the

imports acadapp = autodesk.autocad.applicationservices.autocad

it seems that the objects are not exposed to the second thread. Can anyone help me?

Thanks!

[dmarcotte4]

I don’t think the API supports multiple threads, the stuff I tried failed miserably.

[dahovey]

Well I was able to make it work. I just couldn't use my acadapp variable as shown below. I had list it out explicity. if that makes sense.

imports acadapp = autodesk.autocad.applicationservices.application

[GlennR]

From Tips and Techniques in the ObjectARX documentation:

"ObjectARX Does Not Support Multi-Threaded Programming

If you spawn multiple threads in your application, make sure that no more than one of the threads at a time invokes anything in the ObjectARX system."

[dmarcotte4]

Thanks for pointing that out Glenn
Daniel

[dahovey]

Well thats not good...

Thanks for the help though...

[dgorsman]

So, the implication is that other threads CAN be spawned, as long as they don't have anything to do with AutoCAD, is that correct?

[GlennR]

That's always been my understanding of the situation.

[amiltonf]

I've had success with multiple threads accessing AutoCAD in the past but it was more work than it was worth and AFAIK you *can* use mutliple threads that access AutoCAD but, as the docs say, you have to make sure that they don't do it at the same.

Regards,
Andy F.

[dahovey]

Interesting...With the plotting program I'm using wanted the actual plotting process and loops to be in a separate thread. While the dialog itself would have been accessing autocad but not at the same time as the plotting thread.

But because of using the autocad provided interface for the plotprogress dialog the benefit of multithreading in my app is really very little or nill.