topic Re: Revit 2020 temp path changes every session in Revit API Forum

Revit 2020 temp path changes every session

n.vroegindeweij — Mon, 29 Apr 2019 09:53:41 GMT

Hello all,

In our add-in for Revit we are using the temp path, which can be requested using Path.GetTempPath() in C#.

When this is requested in pre 2020 version, this returned the %TMP% environment variable path.

Since Revit 2020 the requested temp path contains an additional guid at the end of the path, which changes after every restart of Revit(ie. C:\Users\USERNAME\AppData\Local\Temp\84ae8c0d-197b-4b44-b8d3-8823fabbba4f). It seems like Revit changes the temp path for the scope of the application.

Of course we can remove the guid from the path in our add-in, but I'm wondering if this has been done by purpose or could be a bug?

Best regards,

Niels

Revit version: 20.0.0.377 20190327_2315(x64)

Re: Revit 2020 temp path changes every session

jeremytammik — Mon, 29 Apr 2019 11:46:25 GMT

Dear Niels,

Well, it is definitely not a bug, because no intended behaviour has ever been explicitly declared for this, afaik.

Of course, it may still cause a problem for you, depending on your specific needs and how you make use of it.

I would suggest that you use the operating system TMP variable instead of the current Revit.exe temporary path, if that suits your needs better.

I can gladly ask the development team (a) what caused this change, (b) why and (c) whether this is intentional.

They may not be able or willing to provide an answer, though.

I'll let you know what they say as soon as I hear back from them.

Best regards,

Jeremy

Re: Revit 2020 temp path changes every session

Anonymous — Thu, 02 May 2019 14:54:07 GMT

Hello all.

I also have the same problem, and want to know, what is the reason of it? Thanks.

Re: Revit 2020 temp path changes every session

jeremytammik — Thu, 02 May 2019 15:53:53 GMT

As a poet once said referring to more unfortunate circumstances:

Ours is not to wonder why,

Ours is but to do or die.

In this case, I don't know why, and I don't think it will help you or anyone else to know either.

The real question is how to handle the modified behaviour, isn't it?

Re: Revit 2020 temp path changes every session

n.vroegindeweij — Fri, 03 May 2019 05:54:36 GMT

To get the original user temp path, below method can be used. And to have similar behavior as Path.GetTempPath(), it might be good to use TEMP, USERPROFILE, WinDir as fallback variables.

Environment.GetEnvironmentVariable("TMP", EnvironmentVariableTarget.User);

Probably from technical point of view there is nothing wrong with the change of temp path on application level. However, I think it can cause unexpected behavior for a lot add-ins(ie caching in temp, suddenly doesn't work).

Re: Revit 2020 temp path changes every session

Chuong.Ho — Tue, 21 Jun 2022 10:40:38 GMT

Have any explain why Autodesk do that ?

Re: Revit 2020 temp path changes every session

jeremy_tammik — Tue, 21 Jun 2022 10:58:29 GMT

I'm sorry I have no explanation. I can only refer to my answer above to nikita_bokhan...