AndrewR
asked on
How To Tell That Windows Is Shutting Down
I need to be able to tell that windows is in the process of shutting down, so that I can avoid trying to link to some dll's and getting an error.
I have a service which receives the WM_QUERYENDSESSION message, but another application pops up a messagebox asking are you sure etc...
Meanwhile the service spawns another process. This one doesn't get the WM_QUERYENDSESSION and has problem linking to some dll's. I need to be able to know that windows is shutting down... Any ideas?
I have a service which receives the WM_QUERYENDSESSION message, but another application pops up a messagebox asking are you sure etc...
Meanwhile the service spawns another process. This one doesn't get the WM_QUERYENDSESSION and has problem linking to some dll's. I need to be able to know that windows is shutting down... Any ideas?
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Hmm, a service usually receives a 'SERVICE_CONTROL_SHUTDOWN' reuqest when this is happening - if you handle this code in your service's control handler, everything should be fine...
Oops, we are talking about an NT service. jkr is right.
ASKER
so there is no way to tell at the beginning of a program that windows is in the process of shutting down?
There is an ERROR_SHUTDOWN_IN_PROGRESS error, but I haven't found a function that will generate this for me...
A nice little function like
BOOL WindowsShutdownInProgress( )
would be great... ,<sigh> :-)
There is an ERROR_SHUTDOWN_IN_PROGRESS
A nice little function like
BOOL WindowsShutdownInProgress(
would be great... ,<sigh> :-)
The functions generating the ERROR_SHUTDOWN_IN_PROGRESS error are the following.
InitiateSystemShutdownEx
QueryServiceStatusEx
ControlService
EnumServicesStatusEx
But three of them require Windows 2000. Maybe you can use ControlService???
InitiateSystemShutdownEx
QueryServiceStatusEx
ControlService
EnumServicesStatusEx
But three of them require Windows 2000. Maybe you can use ControlService???
>>Maybe you can use ControlService???
AndrewR has to use it, or the service could never be shut down...
>>A nice little function like
>>BOOL WindowsShutdownInProgress( )
>>would be great... ,<sigh> :-)
What about
BOOL WindowsShutdownInProgress( )
{
BOOL bShuttingDown = FALSE;
if ( !InitiateSystemShutdown ( NULL, "message", 5, FALSE, FALSE))
{
if ( ERROR_SHUTDOWN_IN_PROGRESS == GetLastError())
{
bShuttingDown == TRUE;
}
}
AbortSystemShutdown( NULL);
return ( bShuttingDown);
}
;-)
AndrewR has to use it, or the service could never be shut down...
>>A nice little function like
>>BOOL WindowsShutdownInProgress(
>>would be great... ,<sigh> :-)
What about
BOOL WindowsShutdownInProgress(
{
BOOL bShuttingDown = FALSE;
if ( !InitiateSystemShutdown ( NULL, "message", 5, FALSE, FALSE))
{
if ( ERROR_SHUTDOWN_IN_PROGRESS
{
bShuttingDown == TRUE;
}
}
AbortSystemShutdown( NULL);
return ( bShuttingDown);
}
;-)
ASKER
If the WM_QUERYENDSESSION messages have all been sent by Windows, can a new process be create? It seems like it can, but I would have thought that Windows would prevent this.
Well, this usuall results in sth. like 'user32.dll couldn't be initialized...', as you have experienced... BTW: Did you try my suggestion to detect whether a shutdown is in progress?
ASKER
I did try it but I still have the problem. Looks like it could be a timing issue. Between the time the service starts the child process and the child process initialized the dll, the windows shutdown state changes...