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getting notification when a users logs on and off

Posted on 2002-05-02
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Last Modified: 2010-04-04
I am writing a service application and would like to know if there is a way to be notified by windows (2000, XP) when a user logs on and off the computer.
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Question by:mdlittle
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Expert Comment

by:W_Fox
ID: 6986910
I haven't developed services [yet], but if they receive standard windows messages, maybe trapping WM_USERCHANGED is the way. just my $0.02

W_Fox
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Expert Comment

by:Cesario
ID: 6987011
w Fox is right

The WM_USERCHANGED message is sent to all windows after the user has logged on or off. When the user logs on or off, the system updates the user-specific settings. The system sends this message immediately after updating the settings.

WM_USERCHANGED  
wParam = 0;       // not used, must be zero
lParam = 0;       // not used, must be zero
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Accepted Solution

by:
Cesario earned 500 total points
ID: 6987069
If you are using a Service App then catch it in your message loop..

other wise

through a TAppEvents control onto a form

and have some code like

case Msg.Msg of
  WM_USERCHANGED : // your code here
  // other stuff
 end;


Best Regards

Cesario
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