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Detect if Workstation is lockedHi,
I want to detect in my C# app (can use iterop) if the workstation is locked. I've seen on the web people saying it's impossible except by looking if the Screensaver process is running. There must be a clean way of doing it because MSN detects it and can change your status based on this. Does someone have a solution to this please? thanks ThunderMusic Hello ThunderMusic,
There is no fuction to detect whether the workstration locked. You can detect it by checking if any window is visible T> Hi, T> I want to detect in my C# app (can use iterop) if the workstation is T> locked. T> I've seen on the web people saying it's impossible except by looking T> if the T> Screensaver process is running. There must be a clean way of doing it T> because MSN detects it and can change your status based on this. T> Does someone have a solution to this please? T> T> thanks T> T> ThunderMusic T> --- WBR, Michael Nemtsev :: blog: http://spaces.live.com/laflour "At times one remains faithful to a cause only because its opponents do not cease to be insipid." (c) Friedrich Nietzsche ok, but msn does it very very very well, there's certainly a way... Is there
a way to know the state of the computer, locked/unlocked. It does not have to be an event. Only a function that returns locked/not locked. maybe via the user account? thanks ThunderMusic Show quote "Michael Nemtsev" <nemt***@msn.com> wrote in message news:1799a79b3aceb88c8a7211ba6311e@msnews.microsoft.com... > Hello ThunderMusic, > > There is no fuction to detect whether the workstration locked. You can > detect it by checking if any window is visible > > T> Hi, > T> I want to detect in my C# app (can use iterop) if the workstation is > T> locked. > T> I've seen on the web people saying it's impossible except by looking > T> if the > T> Screensaver process is running. There must be a clean way of doing it > T> because MSN detects it and can change your status based on this. > T> Does someone have a solution to this please? > T> T> thanks > T> T> ThunderMusic > T> --- > WBR, > Michael Nemtsev :: blog: http://spaces.live.com/laflour > > "At times one remains faithful to a cause only because its opponents do > not cease to be insipid." (c) Friedrich Nietzsche > > I just tought about it... maybe a message in the wndproc?
Show quote "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message news:eyf$xqO2GHA.4116@TK2MSFTNGP02.phx.gbl... > ok, but msn does it very very very well, there's certainly a way... Is > there a way to know the state of the computer, locked/unlocked. It does > not have to be an event. Only a function that returns locked/not locked. > maybe via the user account? > > thanks > > ThunderMusic > > "Michael Nemtsev" <nemt***@msn.com> wrote in message > news:1799a79b3aceb88c8a7211ba6311e@msnews.microsoft.com... >> Hello ThunderMusic, >> >> There is no fuction to detect whether the workstration locked. You can >> detect it by checking if any window is visible >> >> T> Hi, >> T> I want to detect in my C# app (can use iterop) if the workstation is >> T> locked. >> T> I've seen on the web people saying it's impossible except by looking >> T> if the >> T> Screensaver process is running. There must be a clean way of doing it >> T> because MSN detects it and can change your status based on this. >> T> Does someone have a solution to this please? >> T> T> thanks >> T> T> ThunderMusic >> T> --- >> WBR, >> Michael Nemtsev :: blog: http://spaces.live.com/laflour >> >> "At times one remains faithful to a cause only because its opponents do >> not cease to be insipid." (c) Friedrich Nietzsche >> >> > > See the blurb right after the first example in the link below. There may
very well be a more official API function for checking it, but not likely given what this says (if there were they would have almost certainly pointed you there given that this is the official source) http://windowssdk.msdn.microsoft.com/en-us/library/ms723150.aspx "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message As Michael and John both posted, there IS a way. Test to see if your window news:eyf$xqO2GHA.4116@TK2MSFTNGP02.phx.gbl... > ok, but msn does it very very very well, there's certainly a way... Is > there a way to know the state of the computer, locked/unlocked. is visible (if it's not, and you haven't specifically made it not visible, then the session is locked). Of course, you do need a window for that to work. > It does not have to be an event. Only a function that returns locked/not Also, see the SessionSwitch SystemEvent. It provides access to the > locked. maybe via the user account? WM_WTSSESSION_CHANGE window message in .NET. As long as your program is running, you can use that message to track when session changes occur (including locking and unlocking). By the way, I'd disagree that MSN does this "very well". I've seen it get confused plenty of times. :) Pete I've found a solution, tought maybe it's not the best way, it does the trick
pretty well : http://www.thescripts.com/forum/thread225183.html thanks to all ThunderMusic Show quote "Peter Duniho" <NpOeStPe***@NnOwSlPiAnMk.com> wrote in message news:12glrgu34g9169c@corp.supernews.com... > "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message > news:eyf$xqO2GHA.4116@TK2MSFTNGP02.phx.gbl... >> ok, but msn does it very very very well, there's certainly a way... Is >> there a way to know the state of the computer, locked/unlocked. > > As Michael and John both posted, there IS a way. Test to see if your > window is visible (if it's not, and you haven't specifically made it not > visible, then the session is locked). Of course, you do need a window for > that to work. > >> It does not have to be an event. Only a function that returns locked/not >> locked. maybe via the user account? > > Also, see the SessionSwitch SystemEvent. It provides access to the > WM_WTSSESSION_CHANGE window message in .NET. As long as your program is > running, you can use that message to track when session changes occur > (including locking and unlocking). > > By the way, I'd disagree that MSN does this "very well". I've seen it get > confused plenty of times. :) > > Pete > > I've found a solution, tought maybe it's not the best way, it does the I recommend you investigate this thoroughly. People often apply esoteric > trick pretty well : ways of doing things but unless the techniques are officially sanctioned by MSFT, you're asking for trouble (don't be surprised if it breaks one day IOW). "John Brown" <no_spam@_nospam.com> wrote in message Also consider something that works fine in your environment, butnews:%2338eJWP2GHA.1588@TK2MSFTNGP02.phx.gbl... >> I've found a solution, tought maybe it's not the best way, it does the >> trick pretty well : > > I recommend you investigate this thoroughly. People often apply esoteric > ways of doing things but unless the techniques are officially sanctioned > by MSFT, you're asking for trouble (don't be surprised if it breaks one > day IOW). not someone else's. Consider what happens when, say, running under Terminal Services, Citrix, et.al. I've been burned this way many, many times -- I've since learned my lesson. Later ... Sarge "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message You mean you found *another* solution. Two different methods had already news:u0N6ZPP2GHA.2176@TK2MSFTNGP04.phx.gbl... > I've found a solution, been posted to this thread. > tought maybe it's not the best way, it does the trick pretty well : I think it's a pretty good bet that the other solution you found is not the > > http://www.thescripts.com/forum/thread225183.html best way, and in fact is unlikely to be better than the methods already given in this thread. Pete
Show quote
"ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message When running on XP or higher you can register for session change news:OAhP0dO2GHA.4176@TK2MSFTNGP06.phx.gbl... | Hi, | I want to detect in my C# app (can use iterop) if the workstation is locked. | I've seen on the web people saying it's impossible except by looking if the | Screensaver process is running. There must be a clean way of doing it | because MSN detects it and can change your status based on this. | | Does someone have a solution to this please? | | thanks | | ThunderMusic | | notifications by calling (through PInvoke) the TS API "WTSRegisterSessionNotification", note that you need a Windows procedure to capture the messages. Here are the PInvoke declarations.. [DllImport("wtsapi32.dll")] private static extern bool WTSRegisterSessionNotification(IntPtr hWnd, int dwFlags); [DllImport("wtsapi32.dll")] private static extern bool WTSUnRegisterSessionNotification(IntPtr hWnd); and here how to register... private const int NotifyForThisSession = 0; // This session only WTSRegisterSessionNotification(this.Handle, NotifyForThisSession); and here the messages you can check.. private const int SessionChangeMessage = 0x02B1; private const int SessionLockParam = 0x7; private const int SessionUnlockParam = 0x8; in your overriden WndProc. protected override void WndProc(ref Message m) { // check for session change notifications if(m.Msg == SessionChangeMessage) { if(m.WParam.ToInt32() == SessionLockParam) OnSessionLock(); // Do something when locked else if(m.WParam.ToInt32() == SessionUnlockParam) OnSessionUnlock(); // Do something when unlocked } base.WndProc(ref m); return; } void OnSessionLock() {...} ... void OnSessionUnlock() {...} call "WTSUnRegisterSessionNotification" when you no longer need to be notified... Willy. cool!! wow!! thanks a lot... ;)
Show quote "Willy Denoyette [MVP]" <willy.denoye***@telenet.be> wrote in message news:%23CMVVSP2GHA.3372@TK2MSFTNGP04.phx.gbl... > > "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message > news:OAhP0dO2GHA.4176@TK2MSFTNGP06.phx.gbl... > | Hi, > | I want to detect in my C# app (can use iterop) if the workstation is > locked. > | I've seen on the web people saying it's impossible except by looking if > the > | Screensaver process is running. There must be a clean way of doing it > | because MSN detects it and can change your status based on this. > | > | Does someone have a solution to this please? > | > | thanks > | > | ThunderMusic > | > | > > When running on XP or higher you can register for session change > notifications by calling (through PInvoke) the TS API > "WTSRegisterSessionNotification", note that you need a Windows procedure > to > capture the messages. > > > Here are the PInvoke declarations.. > > [DllImport("wtsapi32.dll")] > private static extern bool WTSRegisterSessionNotification(IntPtr hWnd, > int dwFlags); > > [DllImport("wtsapi32.dll")] > private static extern bool WTSUnRegisterSessionNotification(IntPtr > hWnd); > > and here how to register... > > private const int NotifyForThisSession = 0; // This session only > > WTSRegisterSessionNotification(this.Handle, NotifyForThisSession); > > and here the messages you can check.. > > private const int SessionChangeMessage = 0x02B1; > private const int SessionLockParam = 0x7; > private const int SessionUnlockParam = 0x8; > > in your overriden WndProc. > > protected override void WndProc(ref Message m) > { > // check for session change notifications > if(m.Msg == SessionChangeMessage) > { > if(m.WParam.ToInt32() == SessionLockParam) > OnSessionLock(); // Do something when locked > else if(m.WParam.ToInt32() == SessionUnlockParam) > OnSessionUnlock(); // Do something when unlocked > } > > base.WndProc(ref m); > return; > } > > > void OnSessionLock() {...} > > .. > void OnSessionUnlock() {...} > > > call "WTSUnRegisterSessionNotification" when you no longer need to be > notified... > > Willy. > > "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message Or you could accomplish the same thing simply by handling the SessionSwitch news:eleD62P2GHA.4108@TK2MSFTNGP04.phx.gbl... > > "Willy Denoyette [MVP]" <willy.denoye***@telenet.be> wrote in message > news:%23CMVVSP2GHA.3372@TK2MSFTNGP04.phx.gbl... >> When running on XP or higher you can register for session change >> notifications by calling (through PInvoke) the TS API >> "WTSRegisterSessionNotification", note that you need a Windows procedure >> to capture the messages. > > cool!! wow!! thanks a lot... ;) event, as I posted previously. No p/invoke required. Pete "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message Note that as Peter said, V2 of the framework nicely wraps the stuff I posted news:eleD62P2GHA.4108@TK2MSFTNGP04.phx.gbl... | cool!! wow!! thanks a lot... ;) | | through the SystemEvents class in Microsoft.Win32. Note that just like you have to make sure to call WTSUnRegisterSessionNotification in V1, you'll have to make sure to detach the handler or you'll leak a handle. Here's a small console app. sample... using System; using Microsoft.Win32; public class App { static void Main() { SystemEvents.SessionSwitch += SystemEvents_SessionSwitch; Console.ReadLine(); // block main thread // !! detach the eventhandler when the application terminates, or you will leak a handle. SystemEvents.SessionSwitch -= SystemEvents_SessionSwitch; } static void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e) { if(e.Reason == SessionSwitchReason.SessionLock) {...} } } } Willy. thanks it works fine... ;) excellent!!! we have to spread the word...
because unfortunately, this information is pretty hard to get on the net... it's said almost everywhere that it's not possible to know for sure.... Now it is!! ;) thanks ThunderMusic Show quote "Willy Denoyette [MVP]" <willy.denoye***@telenet.be> wrote in message news:%232POtMW2GHA.1040@TK2MSFTNGP06.phx.gbl... > > "ThunderMusic" <NoSpAmdanlatathotmaildotcom@NoSpAm.com> wrote in message > news:eleD62P2GHA.4108@TK2MSFTNGP04.phx.gbl... > | cool!! wow!! thanks a lot... ;) > | > | > > Note that as Peter said, V2 of the framework nicely wraps the stuff I > posted > through the SystemEvents class in Microsoft.Win32. > Note that just like you have to make sure to call > WTSUnRegisterSessionNotification in V1, you'll have to make sure to detach > the handler or you'll leak a handle. > > Here's a small console app. sample... > > using System; > using Microsoft.Win32; > > public class App > { > static void Main() > { > > SystemEvents.SessionSwitch += SystemEvents_SessionSwitch; > Console.ReadLine(); // block main thread > // !! detach the eventhandler when the application terminates, or you will > leak a handle. > SystemEvents.SessionSwitch -= SystemEvents_SessionSwitch; > } > static void SystemEvents_SessionSwitch(object sender, > SessionSwitchEventArgs e) > { > if(e.Reason == SessionSwitchReason.SessionLock) > {...} > } > } > > } > > > Willy. > >  |
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