While the question was originally titled about retrieving SQL Server's installation path, I felt it was more about a code translation problem (the solution already existed, just not in the right language).
But then I thought that the method in the original code was fairly blunt.
Evan provided you with what I assume is a workable translation of the existing solution. But probably a much easier way to perform this specific task - assuming you just need to find the installation path for an instance you're already connected to, and assuming that a user who can read the registry will also have VIEW SERVER STATE
permissions - is to issue this simple query against the DMV sys.dm_os_loaded_modules
from your program:
SELECT name
FROM sys.dm_os_loaded_modules
WHERE name LIKE '%sqlservr.exe';
This will give you something like this:
C:\Program Files\Microsoft SQL Server\MSSQL11.SQL2012\MSSQL\Binn\sqlservr.exe
You have some parsing to do, depending on exactly what you're after (e.g. do you want to stop at MSSQL
, or Binn
?), but this is much easier than reading the registry or other methods that are out there IMHO.