Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Using the standard win32 api, what’s the best way to detect more than one user is logged on? I have an upgrade to our software product that can’t be run when more than one user is logged in. (I know this is something to be avoided because of its annoyance factor, but the product is very complicated. You’ll have to trust me when I say there really is no other solution.) Thanks.
In order to have more than one user logged in at once, Terminal Services or Fast User Switching must be enabled. Since Fast User Switching is implemented using Terminal Services, you first need to find out if the OS has it enabled. You can use GetVersionEx with an OSVERSIONINFOEX. Check for the VER_SUITE_SINGLEUSERTS and VER_SUITE_TERMINAL flags.
If TS is enabled, you can use WTSEnumerateSessions to find out how many users are logged on. This only works if the ‘Terminal Services’ service is started.
If the machine doesn’t support Terminal Services (or if the service isn’t started), then you can only have one user logged on.