topic Re: Document Session ID in Revit API Forum

Document Session ID

tobias.floescher — Tue, 03 Nov 2020 12:58:58 GMT

Hello

Sorry for my stupid question, can't find an answer. But I'm sure there is a way.

Is there something like a session id for open documents?

I would like to uniquely identify a Autodesk.Revit.DB.Document object, for example in the ViewActivated Event. This is needed while more than one document can be open at the same time in Revit. Because I hold some stuff in memory, I need to know to which document it belongs.

The DocumentPath as Id is not an option, because newly created documents have a zero string (could be occur more than one as well in a session)

Many thanks for hints

Tobias

Re: Document Session ID

jeremytammik — Tue, 03 Nov 2020 14:07:23 GMT

Dear Tobias,

As we all know, there are no stupid questions.

Sometimes people would be better served searching for an answer themselves before asking others. It seems to me you have already searched, with no fruitful results. Thank you for that. However, there is some information on this already out there, waiting to be found:

Every Revit project includes a singleton ProjectInformation database element. Every database element has a unique identifier. So, theoretically, you could use that to uniquely identify a project.

Unfortunately, if I create a project A, and then copy it for reuse in project B, the two ProjectInformation elements will have the same unique id, so this solution only works if you can guarantee that no such copy will ever be created:

https://thebuildingcoder.typepad.com/blog/2017/12/project-identifier-and-fuzzy-comparison.html#2

Here is a some further analysis of this situation:

https://the3dwebcoder.typepad.com/blog/2015/07/implementing-mongo-database-relationships.html#2

To address this, I suggested a different and safer solution using an extensible storage schema and a named GUID storage for project identification instead:

https://thebuildingcoder.typepad.com/blog/2016/04/named-guid-storage-for-project-identification.html

I hope these various thoughts and suggestions can help.

Please do let us know how you end up solving this.

Thank you!

Cheers,

Jeremy

Re: Document Session ID

tobias.floescher — Tue, 03 Nov 2020 14:35:48 GMT

Hello Jeremy

Indeed, I searched before without a satisfying result.

I came to the same conclusion as your solutions. I was hoping there was something else 😉

Possibly use the combination of unique identifier and the file path, but this is not very elegant. I think I will end up in use the solution with extensible storage. maybe a second scheme, not the same as my plugin use for storing its data.

Thank's a lot for your answer

regards,

tobias

Re: Document Session ID

RPTHOMAS108 — Tue, 03 Nov 2020 16:14:54 GMT

Some documents don't contain a path (yet to be saved ones).

Document.GetHashCode has served me well over the years. Mainly I use this in static variable to see if the current document has switched via the ViewActivatedEvent.

Re: Document Session ID

tobias.floescher — Wed, 04 Nov 2020 09:49:44 GMT

Ah very nice. thank you for that.

read the manual:

https://www.revitapidocs.com/2020/006a71c2-4393-e036-9987-14467342a7d3.htm