如何捕获Windows Server 2003中取消的注销

Question

I'm working on a terminal services based system running on windows 2003. It consists of a desktop replacement application from which the user starts programs. It also has a logoff-button. When the user logs off two things must happen. First off, he is logged out of windows. Then a stored procedure is called cleaning up the users database state. This almost works fine, but for one situation, and that is when the user cancels the logoff event. Typical scenario: 1- User logs in, starts MS Word, edits the document, does not save. 2 - The user then presses the logoff button. 3- MS Word reacts to this asking the user to save his changes. 4 - The user presses cancel.

At this point the desktop application might already have called the stored procedure cleaning up the database state. How do I catch this behaviour in the desktop application? Is there a message saying that the end session operation was cancelled?

Does my question make sense at all?

Oh, all of the applications are written in Delphi 7, but I work in C, C++ and C# as well, so answers in those languages are appreciated as well.

Answer 1

If your user state logic is inside your shell replacement then think of Application redesign: Decouple Custom Shell from Session management.

For example: Move your User state logic in a service. Within this service register for RDS Notifications: WTS_SESSION_LOGON/WTS_SESSION_LOGOFF.

I think WTS_SESSION_LOGOFF is sent only when actual logoff occurs ie if the user clicks Cancel button in Word then Windows would know that the user hasn't logged off actually and OS would not send WTS_SESSION_LOGOFF (this is untested, but sounds logical).

This way you don't deal with WM_ENDSESSION/WM_QUERYENDSESSION stuff.

Recently I wrote some guidance on RDS notifications topic.