🚀 go-pugleaf

"Emmanuel" <emmanuel@erphk.com> wrote in message
news:3ef0cb12@newsgroups.borland.com...

> would you tell me how the TService can
> know the user is login or not

What you ask for is not trivial to accomplish.  The overall Services
architecture was not designed to support querying such information.  It is
possible, but it takes a lot of coding to accomplish.

Basically, under XP, you have to use the WTSGetActiveConsoleSessionId() and
WTSQuerySessionInformation() function. However, those functions are not
available on pre-XP systems so when running under XP, you'll have to
dynamically load the functions at runtime via LoadLibrary() and
GetProcAddress() so that your executable will still run on pre-XP systems
without producing a runtime error at startup.

Under pre-XP systems, you have to instead enumerate all running processes
looking for EXPLORER.EXE, the main OS shell that is executed whenever a user
logs in.  Once you find the process, you have to extract its access token
and pass it to GetTokenInformation() to get the SID for the process, and
then you can use LookupAccountSid() to get the username belonging to that
SID.

Either way, you'll know if a user is logged in or not by whether you can
locate a valid username or not.


Gambit