How to find out if it is Revit viewer which is running or Revit itself Revit api

Question

I am wondering how can find out in my app if the user are using the Revit viewer or running the actual Revit. I am using c#

Answer 1

This works for me:

string[] args = Environment.GetCommandLineArgs();
if (args.Contains("/viewer"))
    ...

This is how the Revit Viewer shortcut works, and how I most often start Revit through VS, to keep a license free.

Answer 2

One possibility is to examine the contents of the Revit main window caption and determine whether it contains the words 'viewer':

http://thebuildingcoder.typepad.com/blog/2013/01/determine-revit-demo-mode-revisited.html

Look at the CmdDemoCheck external command in The Building Coder samples .

You can also try to modify the current document; if that is possible, it is definitely not in viewer mode:

http://thebuildingcoder.typepad.com/blog/2012/03/determine-revit-demo-mode.html

Third and probably best suggestion: check the serial number. If Revit is running in demo mode, the serial number is 000-00000000:

http://thebuildingcoder.typepad.com/blog/2013/01/determine-revit-demo-mode-and-serial-number.html