This question is from the Forum
Q: When I log on to the main interface and do not perform any operation within the specified time, the system will log out (just like the screen saver on the computer ).
A: Actually, it's very easy. Just refer to an API function: getlastinputinfo. The following is the reference code.
The demo program is minimized without any mouse or keyboard activity within 10 seconds. Then, shake the mouse to restore it.
Using
System;
Using
System. Collections. Generic;
Using
System. componentmodel;
Using
System. Data;
Using
System. drawing;
Using
System. text;
Using
System. Windows. forms;
Using
System. runtime. interopservices;
Namespace
Windowsapplication28
...
{
Public
Partial
Class
Form1: Form
...
{
[Structlayout (layoutkind. Sequential)]
Public
Struct
Lastinputinfo
...
{
[Financialas (unmanagedtype. U4)]
Public
Int
Cbsize;
[Financialas (unmanagedtype. U4)]
Public
Uint
Dwtime;
}
[Dllimport (
"
User32.dll
"
)]
Public
Static
Extern
Bool
Getlastinputinfo (
Ref
Lastinputinfo plii );
Public
Long
Getidletick ()
...
{
Lastinputinfo vlastinputinfo
=
New
Lastinputinfo ();
Vlastinputinfo. cbsize
=
Marshal. sizeof (vlastinputinfo );
If
(
!
Getlastinputinfo (
Ref
Vlastinputinfo ))
Return
0
;
Return
Environment. tickcount
-
(
Long
) Vlastinputinfo. dwtime;
}
Public
Form1 ()
...
{
Initializecomponent ();
}
Private
Void
Form1_load (
Object
Sender, eventargs E)
...
{
This
. Timer1.interval
=
2000
;
This
. Timer1.enabled
=
True
;
}
Private
Void
Timereffectick (
Object
Sender, eventargs E)
...
{
Long
I
=
Getidletick ();
This
. Text
=
String
. Format (
"
You haven't moved {0} ms, says jinjazz.
"
, I );
If
(I
>
10
*
1000
)
...
{
This
. Windowstate
=
Formwindowstate. minimized;
}
Else
...
{
This
. Windowstate
=
Formwindowstate. normal;
}
}
}
}
