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Check Program idle and timeout

Posted on 2003-11-16
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Last Modified: 2010-04-05
I need to develop the program that has the timeout feature.
If the program idle for 1 hrs, it will automatic close
How can i check the program idle for 1 hrs ?
I had think about timer but is it affect
the program performance and normal
operation ?

Any Suggestion
Thx !
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Question by:expert256256
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1 Comment
 
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Accepted Solution

by:
snehanshu earned 375 total points
ID: 9761527
expert256256,
I haven't tried this before but you could do this (Hope it helps):
If your question is "how to determine whether or not the application was idle for 1 hour", then IMHO, you could track the application's messages and reset the timer if the message was a mouse or keyboard event.
Perhaps something like this (With more ORs added in the AppMessage procedure):

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure AppMessage(var Msg: TMsg; var Handled: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.AppMessage(var Msg: TMsg; var Handled: Boolean);
begin
//  Check message type: the list here can be expanded to Mouse button down etc.
  Application.OnIdle
  If (Msg.message = WM_MOUSEFIRST) OR (Msg.message = WM_MOUSELAST)
    OR (Msg.message = WM_KEYFIRST) OR (Msg.message = WM_KEYLAST) Then
  begin
    Timer1.Enabled := False;
    Timer1.Enabled := True;
  end
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Timer1.Interval := (1000 * 60*60);
  Timer1.Enabled := True;
  Application.OnMessage := AppMessage;//Monoitor all messages to the application
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  Timer1.Enabled := False;//Idle for too long: terminate
  Application.Terminate;
end;

end.

Perhaps something could be done using Application.OnIdle etc. but I haven't used those before.
The above example is for "Application Idle", for "system Idle" you could use hooks or journal records.
HTH,
...Snehanshu
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