Is there any way to get the directory path of the 12 Hive programmatically? I am creating a feature which delivers a file to the XML directory in the 12 hive, and I don't want to hardcode the directory path in my code.
Is there any Object Model property which exposes the 12 Hive directory path string as a property?
You can use the Microsoft.SharePoint.Utilities.SPUtility.GetGenericSetupPath() method. See for more information the WSS SDK: http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.utilities.sputility.getgenericsetuppath.aspx
Why would you need to put xml files in the 12 hive? That way you are working "unsupported" Wouldn't it be easier to just deploy to the TEMPLATE\XML folder?
Have you ever seen a SharePoint installation where the 12-hive was not in the same place as usual? I don't think Microsoft even supports having it somewhere else..
Even so you can probably do a MapPath to the "/_layouts" directory to get the value.
32bit vs. 64bit shouldn't matter because in either case Program Files is c:\Program Files.
What does matter is OS language which can change the literal text of c:\Program Files\Common Files. The right way to get that directory is: System.Environment.GetFolderPath(System.Environment.SpecialFolder.CommonProgramFiles);
Then you can use that folder and then concatenate the rest of the items...I don't think those items are language specific.
Just want to add that if you use MapPath() in Sharepoint, you receive a path that points to the location of the website, by default 'Inetpub', such as:
C:\Inetpub\wwwroot\wss\VirtualDirectories\12345\myFolder
The path doesn't point to the 12-hive.
来源：https://stackoverflow.com/questions/943933/get-directory-path-to-12-hive-programmatically