Checking for workstation lock/unlock change with c#

Question

DUPLICATE: How can I programmatically determine if my workstation is locked?

How can I detect (during runtime) when a Windows user has locked their screen (Windows+L) and unlocked it again. I know I could globally track keyboard input, but is it possible to check such thing with environment variables?

Answer 1

A SessionSwitch event may be your best bet for this. Check the SessionSwitchReason passed through the SessionSwitchEventArgs to find out what kind of switch it is and react appropriately.

Answer 2

You can get this notification via a WM_WTSSESSION_CHANGE message. You must notify Windows that you want to receive these messages via WTSRegisterSessionNotification and unregister with WTSUnRegisterSessionNotification.

These posts should be helpful for a C# implementation.

http://pinvoke.net/default.aspx/wtsapi32.WTSRegisterSessionNotification

http://blogs.msdn.com/shawnfa/archive/2005/05/17/418891.aspx

http://bytes.com/groups/net-c/276963-trapping-when-workstation-locked

Answer 3

This might help.

Answer 4

You absolutely don't need WM_WTSSESSION_CHANGE Just use internal WTTS apis.