Getting Language of Windows Startup Messages
I'm currently trying to get my head around MUI, and getting some issues with GetSystemDefaultUILanguage - it's not returning the language I'd expect:
Users can set the language used for Windows startup messages in the "Welcome screen and new user accounts settings" dialog - which claims to copy language settings to system accounts. I'd expect therefore to be able to get the language used by startup messages using GetSystemDefaultUILanguage - but it seems to only ever come back with the language used to originally install the OS. How can I get the startup messages language?
It appears that GetSystemDefaultUILanguage returns the language that the OS was originally installed with. In 2K8 R2 at least (and probably other post-Vista OSes) users can modify the language used for boot up messages - but this is unfortunately not reflected through GetSystemDefaultUILanguage.
It can however be looked up via the registry. The following value stores a textual description (e.g. en-US) of the language:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\Settings\PreferredUILanguages
This value only appears to be set on machines with multiple languages installed (and possibly only when a user has changed the Welcome Screen language).
So, to get the current Welcome Screen language, the flow appears to be:
- Attempt to read PreferredUILanguages
- If found, parse to a language ID
- Otherwise, call GetSystemDefaultUILanguage
- Load the appropriate language resources given the returned language ID
This wouldn't be such a pain if we weren't trying to display things in a different language at boot time! Normally you can just use GetUserDefaultUILanguage.
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