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POc# How to get the events when the screen/display goes to power OFF or ON?
 

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  1. POc# How to get the events when the screen/display goes to power OFF or ON?
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    <p>Hi I have been searching but I can't find the answer. How do I know when the screen is going off or on. Not the SystemEvents.PowerModeChanged . I dont know how to retrieve the display/screen EVENTS</p> <pre><code> private const int WM_POWERBROADCAST = 0x0218; private const int WM_SYSCOMMAND = 0x0112; private const int SC_SCREENSAVE = 0xF140; private const int SC_CLOSE = 0xF060; // dont know private const int SC_MONITORPOWER = 0xF170; private const int SC_MAXIMIZE = 0xF030; // dont know private const int MONITORON = -1; private const int MONITOROFF = 2; private const int MONITORSTANBY = 1; [DllImport("user32.dll")] //static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam); private static extern int SendMessage(IntPtr hWnd, int hMsg, int wParam, int lParam); public void Init(Visual visual) { SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged; HwndSource source = ((HwndSource)PresentationSource.FromVisual(visual)); source.AddHook(MessageProc); Handle = source.Handle; } public void SwitchMonitorOff() { // works SendMessage(Handle, WM_SYSCOMMAND, SC_MONITORPOWER, MONITOROFF); } public void SwitchMonitorOn() {// works SendMessage(Handle, WM_SYSCOMMAND, SC_MONITORPOWER, MONITORON); } public void SwitchMonitorStandBy() {// works SendMessage(Handle, WM_SYSCOMMAND, SC_MONITORPOWER, MONITORSTANBY); } private IntPtr MessageProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { if (msg == WM_SYSCOMMAND) //Intercept System Command { // not finished yet // notice the 0xFFF0 mask, it's because the system can use the 4 low order bits of the wParam // value as stated in the MSDN library article about WM_SYSCOMMAND. int intValue = wParam.ToInt32() &amp; 0xFFF0; switch (intValue) { case SC_MONITORPOWER: //Intercept Monitor Power Message 61808 = 0xF170 InvokeScreenWentOff(null); Log("SC:Screen switched to off"); break; case SC_MAXIMIZE: // dontt know : Intercept Monitor Power Message 61458 = 0xF030, or //InvokeScreenWentOn(null); Log("SC:Maximazed"); break; case SC_SCREENSAVE: // Intercept Screen saver Power Message 61760 = 0xF140 InvokeScreenSaverWentOn(null); Log("SC:Screensaver switched to on"); break; case SC_CLOSE: // I think resume Power Message 61536 = 0xF060 //InvokeScreenWentOn(null); //InvokeScreenSaverWentOff(null); Log("SC:Close appli"); break; case 61458: Log("Resuming something"); // 61458:F012:F010 == something of resuming SC_MOVE = 0xF010; break; } } return IntPtr.Zero; } </code></pre> <p><strong>EDIT</strong></p> <p>Perhaps I can explain my intension, so there is perhaps a better solution. I have a Dual binding WCF service running on. It's running on an archos (portable tablet pc). I want that when the user stopped working for an idle time, the connection closes immediatly, and when the computer is returning from idle, he reconnects immediatly. The idea of <a href="http://www.codeproject.com/KB/miscctrl/Application_Idle.aspx" rel="noreferrer">Application Idle on Code project</a> from Tom is already a good idea. The less power consumption , the better. The startup must be as fast as possible.</p>
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