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Monitoring Inactivity in Delphi

Posted on 2005-03-22
Medium Priority
Last Modified: 2010-04-05
I'm writing a program and I need a way to enable a timer when
a user stops all activity on a computer(mouse movement, keyboard)
The program will always be running in the System tray.

Any code would be appreciated.
Question by:ralph44e
  • 2
  • 2
LVL 46

Expert Comment

ID: 13603130
Why not just use the system inactivity monitor?

Create a screen saver

Set the screen saver to the Desktop default, using the inactivity time limit you want.

I probably need a bit more information on what you are trying to do.

1. Do you want to start a timer or reset a timer when mouse/keyboard events happen?
2. Do you want to take some action if the interval between events exceeds some preset limit?
3. What do you want to do when the system goes into power-save mode?
4. What do you want to do when the user logs off?
5. How is your application started?
6. Is your application running as a Windows service?
LVL 15

Expert Comment

ID: 13603383
try this simple code.

function secondsIdle: dword;
var liInfo: TLastInputInfo;
        liInfo.cbSize := SizeOf(TLastInputInfo) ;
        GetLastInputInfo(liInfo) ;
        Result := (GetTickCount - liInfo.dwTime) DIV 1000  ;

Now have a timer set on every 30 seconds:

if secondsIdle > 10000 then begin
   form1.caption:='User has been idle for more than 10 minutes!';
LVL 15

Accepted Solution

mikelittlewood earned 1000 total points
ID: 13603396
In your case, turn on a timer here:
if secondsIdle > 10000 then begin
LVL 17

Expert Comment

ID: 13605100
use a TApplication ("Additional" tab in the components list)
and use the "OnIdle" event
LVL 46

Expert Comment

ID: 13605332
I thought this question was about any idle period in any application

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