Question

Timed LogOut

Asked by: geocoins-software

I have a small desktop database application.  

I would like to add a automatic LogOff operation (timed).

I was looking for a good suggestion on how to handle this.

This application has an  additional thread that does some processing (interacting with the database and drawing  on a custom control on the the main form .

I would like to have an administrative time option that can be set  (Example: 3 minutes) where if there is no activity in the set time, the system will automaticlly logoff and show the logOn screen.

Currently, I have two main menu items (and tool bar buttons) which handle LogOn and LogOff.

I keep a global variable which tracks whether user is LoggedOn or LoggedOff :  (gLoggedOn)

Thanks

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Asked On
2008-12-10 at 15:14:49ID23974595
Topic

Delphi Programming

Participating Experts
2
Points
500
Comments
2

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Answers

 

by: rllibbyPosted on 2008-12-11 at 07:39:43ID: 23149170


If you already have the logon / logoff functionality, then it seems like the issue would be determining when/how to call it. If you take a look at the following PAQ, you will find code that demonstrates an auto-minimize when the app is idle (defined by no mouse clicks / key events) for a set amount of time.

http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_21403528.html

Seems like it would be pretty simple to adapt the code to call your logoff functionality.

Russell
 

 

by: JohnjcesPosted on 2008-12-11 at 09:10:44ID: 23150126

Here is a simple method you could use which is system wide meaning that if your application AND any other system function is idle then you could log them off.

You have to call the function SecondsIdle every so often to return the value of how many seconds the system has been idel, mouse movement, key strokes etc.

John

function SecondsIdle: DWord;
var
  liInfo: TLastInputInfo;
begin
 liInfo.cbSize := SizeOf(TLastInputInfo) ;
 GetLastInputInfo(liInfo) ;
 Result := (GetTickCount - liInfo.dwTime) DIV 1000;
end;
 
Basic usage: (Set timer for whatever value you want to check)
 
procedure TForm1.Timer1Timer(Sender: TObject) ;
begin
   Caption := Format('System IDLE last %d seconds', [SecondsIdle]) ;
end;
 
//OR...
 
procedure TForm1.Timer1Timer(Sender: TObject) ;
begin
   if SecondsIdle > 300 {5 minutes} then
    LogOffYourUser;
end;

                                              
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