Re: Why It didn't work when calling InitiateSystemShutdown() with local system privilege in Vista and 2008?

Hi Jojo,

Thanks for your feedback.

Please let me describe my workaround in details.

First, I create a new Windows application (Notifyapp.exe). This application
just pops up a common message box to show the user that the system will
shutdown in 10 minutes.

MessageBox(NULL,TEXT("System will shutdown in 10
minutes!"),TEXT("Warning"),MB_OK);

Second, I create windows service to call the CreateProcessAsUser the run
the Notifyapp.exe under logged on user session.

//use CreateProcessAsUser to run the Notifyapp.exe under users' session
bResult = CreateProcessAsUser(
hUserTokenDup, // client's access token
NULL, // file to
execute
CommandLine, // command line
&sa, // pointer to
process SECURITY_ATTRIBUTES
&sa, // pointer to
thread SECURITY_ATTRIBUTES
FALSE, // handles are not
inheritable
dwCreationFlags, // creation flags
pEnv, // pointer to new
environment block
NULL, // name of current
directory
&si, // pointer to
STARTUPINFO structure
&pi ); // receives
information about new process

Then, I make the service sleep for 10 minutes.

//force the service pause for 10 minutes
::Sleep(600000);

Finally, I call IniciateSystemShutdown to shutdown the system.

//call the InitiateSystemShutdown to shutdown the system
fResult = InitiateSystemShutdown(
NULL, // shut down local computer
lpMsg, // message for user
30, // time-out period, in seconds
FALSE, // ask user to close apps
TRUE); // reboot after shutdown

I am not very sure about what you mean by "launch my UI program which calls
the InitiateSystemShutdown() in the 'Console Session'". Since the Session 0
is reserved for service and system process in Windows Vista and later.
Therefore it is not good idea to create a user interface (UI), such as a
dialog box, in Session 0. Because the user is not running in Session 0, he
or she never sees the UI and therefore cannot provide the input. I assume
that the 'Console Session' here you mean is the first logged on user
session. Please correct me if I misunderstand you.

When I call InitiateSystemShutdown in a user session(e.g. session 1), the
shutdown dialog box will be displayed and show that the system will be shut
down in a few minutes/seconds. However, there is no full-screen UI to block
shutdown process, and system is always shut down.

Let me know if you have any additional questions and concerns.

Regards,
Rongchun Zhang (v-rzhang@xxxxxxxxxxxxxxxxxxxx, remove 'online.')
Microsoft Online Community Support

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