How to detect that a user has logged in (Service & NT)

[EiSl]

Hello folks, I know that a service process (under NT/Win2k) should not communicate with GUI, since no user has to be logged in so no shell is available. But... When my service is crashing (unhandled exception), I want my general exception handler sends a messagebox to the user in case there's a user logged in. So... How can I detect if a shell exist (aka: a user is logged in), so I can safely shoot a messagebox. Thanks, EiSl

[Nish Nishant]

hi this might be a dumb technique but I think you can use GetDesktopWindow() and if that returns NULL, that probably means there is no user logged in nish

[Tomasz Sowinski]

I think you should rather write this info to the Windows Event Log. Anyway, if you need to interact with the desktop, first read 'Interactive Services' in your VC++ help. It should be under Platform SDK/DLLs, Processes, and Threads. Tomasz Sowinski -- http://www.shooltz.com