Creating a Windows Service to open a program- Delphi

Question

I\'m creating a Windows Service with Delphi. What my service needs to do is basically open a program. In my code I\'m using WinExec(aux,SW_SHOWNORMAL);. When I star

Answer 1

Services always run in Session 0. A process started by a service runs in the service's Session by default, unless the service uses CreateProcessAsUser() to run the process in a different Session.

In XP and earlier, the first user to log in also runs in Session 0 (subsequent users to login run in Sessions 1+). Thus, if the service is marked as Interactive when it is installed and it runs a process that has a UI, a user running in Session 0 can see the UI.

In Vista and later, this is no longer possible. Users never run in Session 0 anymore, and services cannot be marked as Interactive anymore. This is known as "Session 0 Isolation". A service must use CreateProcessAsUser() now in order to run a UI process in an Interactive Session so a user can see it.

Refer to MSDN for more details:

Session 0 Isolation

Impact of Session 0 Isolation on Services and Drivers in Windows

Calling CreateProcessAsUser() from service

Launching an interactive process from Windows Service in Windows Vista and later

CreateProcessAsUser function