How to run a code everytime the user in which my program is running logs in the user from lock screen?

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I want to put the mouse cursor in the center of primary screen everytime the user enters for example his password (or without a password if there's no one set) or enters with fingerprints and enters the desktop of the user from lock screen so he won't have to look for the mouse cursor especially when there are multiple screens.

What I have tried:

Cursor.Position = new Point(
//Screen.PrimaryScreen.Bounds.X + 
Screen.PrimaryScreen.Bounds.Width / 2,
// Screen.PrimaryScreen.Bounds.Y +
 Screen.PrimaryScreen.Bounds.Height / 2);

Posted 14-Nov-20 9:03am

john1990_1

Updated 15-Nov-20 11:37am

v3

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Richard MacCutchan 15-Nov-20 4:45am

You need to find out whether Windows broadcasts a notification message to tell all applications that the screen is unlocking.

john1990_1 15-Nov-20 14:09pm

Or I can make my program look in Even Viewer with a timer every 100 milliseconds and check if there was an unlock in the past 150 milliseconds and then if yes not do the action again for 400 milliseconds...

Richard MacCutchan 15-Nov-20 14:48pm

Well, whatever works for you.

john1990_1 15-Nov-20 16:17pm

I was expecting some help as what I'm finding in Google isn't working.

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Michael Haephrati · Accepted Answer · 2020-11-15T11:37:00

Solution 1

Wait for the Session Switch event.[^].

static void SystemEvents_SessionSwitch(object sender, Microsoft.Win32.SessionSwitchEventArgs e)
{
     if (e.Reason == SessionSwitchReason.SessionUnlock)
     {
         //unlock screen
         Console.WriteLine("Screen unlocked");
     }
}

Posted 15-Nov-20 11:37am

Michael Haephrati

Comments

john1990_1 15-Nov-20 17:55pm

Thx, I added in Main() this:
SessionSwitch += SystemEvents_SessionSwitch;
And still the event doesn't fire (not even to the breakpoint on the "if").

Dave Kreskowiak 15-Nov-20 23:32pm

It works find in a Windows Forms app. The SystemEvents class is wrapping the WTSRegisterSessionNotification Win32 function. It requires a window with a message pump in order to work, so it will not work in a Console or Windows Service app.

john1990_1 15-Nov-20 23:33pm

I'm running it in Windows Forms app, maybe I should move it to FormMain's class not in Program class and Main()?

Dave Kreskowiak 16-Nov-20 1:31am

Uhhh, eah. The message pump on a Forms app doesn't start until the Run method is called.

john1990_1 16-Nov-20 1:56am

I changed to:
void FormMain_Shown(object sender, EventArgs e)
{
SessionSwitch += SystemEvents_SessionSwitch;
}
And put it all in FormMain which is called from Run in Main(), maybe I should run another form and close it in Main() so this starts firing?

Dave Kreskowiak 16-Nov-20 11:07am

I couldn't tell you. I can't see your code at all, so I have no idea what you're doing wrong.

All you should have to do is wire up the SessionSwitch event, but from what you did post, it doesn't look right. First, you do NOT put event wire up code in the Shown event will fire every time the window is shown, so you do NOT want to wire up events over and over again. Put the wire up code in the form class constructor or the forms Load event handler.

It should be

SystemEvents.SessionSwitch += SystemEvents_SessionSwitch;

john1990_1 16-Nov-20 13:23pm

Thx, for future readers: this worked for me:
static void HandleSessionSwitch(object sender, Microsoft.Win32.SessionSwitchEventArgs e)
{
if (e.Reason == Microsoft.Win32.SessionSwitchReason.SessionUnlock)
{
MessageBox.Show("Screen unlocked");
}
}

private void FormMain_Load(object sender, EventArgs e)
{
Microsoft.Win32.SystemEvents.SessionSwitch += HandleSessionSwitch;