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originally posted 2013-8-29 |
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace NPT.Common { /// <summary> /// Polls the system periodically and raises the IsIdle event if the /// user interface has been idle for at least the specfied number of seconds. /// Stops polling once the IsIdle is fired, use Start() to resume polling. /// </summary> public class IdleTimer : IDisposable { [DllImport("user32.dll")] static extern bool GetLastInputInfo(ref LASTINPUTINFO plii); internal struct LASTINPUTINFO { public Int32 cbSize; public Int32 dwTime; } private int timeoutSeconds = 0; private int pollSeconds = 0; private System.Timers.Timer timer = null; private System.ComponentModel.ISynchronizeInvoke sychronizingObject = null; //ctor public IdleTimer(int idleTimeoutSeconds, System.ComponentModel.ISynchronizeInvoke sychronizingObject = null) { if (System.Diagnostics.Debugger.IsAttached) System.Diagnostics.Debug.WriteLine("IdleTimer: Created"); pollSeconds = 5; if (idleTimeoutSeconds < 5) { idleTimeoutSeconds = 5; pollSeconds = 4; } this.timeoutSeconds = idleTimeoutSeconds; this.sychronizingObject = sychronizingObject; public void Start() { System.Diagnostics.Debug.WriteLine("IdleTimer: Started"); StartPolling(); } public void Stop() { System.Diagnostics.Debug.WriteLine("IdleTimer: Stopped"); StopPolling(); } //event public delegate void IsIdleEventHandler(object sender, IdleTimerEventArgs e); public event IsIdleEventHandler IsIdle; protected virtual void OnIsIdle(IdleTimerEventArgs e) { //raise event StopPolling(); if (IsIdle != null) IsIdle(this, e); } //start polling idle time private void StartPolling() { if (timer == null) { timer = new System.Timers.Timer(pollSeconds * 1000); timer.Elapsed += new System.Timers.ElapsedEventHandler(Poll); if (sychronizingObject != null) timer.SynchronizingObject = sychronizingObject; } timer.Start(); } //stop polling idle time private void StopPolling() { if (timer != null) timer.Stop(); } //poll idle time private void Poll(object sender, System.Timers.ElapsedEventArgs e) { StopPolling(); int idleSeconds = GetIdleTime(); if (idleSeconds >= timeoutSeconds) { if (System.Diagnostics.Debugger.IsAttached) { System.Diagnostics.Debug.WriteLine("IdleTimer: Idle - Timeout = {1} seconds, Idle time = {0} seconds", idleSeconds, timeoutSeconds); } //system has been idle for at least timeoutSeconds seconds OnIsIdle(new IdleTimerEventArgs(idleSeconds:idleSeconds,timeoutSeconds:timeoutSeconds)); } StartPolling(); } /// <summary> /// Returns system idle time in seconds /// </summary> /// <returns></returns> public int GetIdleTime() { int systemUptime = Environment.TickCount; int lastInputTicks = 0; int idleTicks = 0; LASTINPUTINFO lastInputInfo = new LASTINPUTINFO(); lastInputInfo.cbSize = (Int32)Marshal.SizeOf(lastInputInfo); lastInputInfo.dwTime = 0; if (GetLastInputInfo(ref lastInputInfo)) { lastInputTicks = (int)lastInputInfo.dwTime; idleTicks = systemUptime - lastInputTicks; } Int32 seconds = idleTicks / 1000; return seconds; } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { if (disposing) { StopPolling(); timer = null; sychronizingObject = null; if (System.Diagnostics.Debugger.IsAttached) { System.Diagnostics.Debug.WriteLine("IdleTimer: Disposed"); } } } } public class IdleTimerEventArgs : EventArgs { public IdleTimerEventArgs(int idleSeconds, int timeoutSeconds) { IdleSeconds = idleSeconds; TimeoutSeconds = timeoutSeconds; } public int IdleSeconds { get; set; } public int TimeoutSeconds {get; set;} } } using System; using System.Text; using System.Runtime.InteropServices; using System.Security.Permissions; using System.Threading; //obsolete: [assembly: SecurityPermission(SecurityAction.RequestMinimum, UnmanagedCode = true)] namespace System.Windows.Forms { public class MessageBoxEx { public static DialogResult Show(string text, uint timeoutSeconds) { Setup("", timeoutSeconds); return MessageBox.Show(text); } public static DialogResult Show(string text, string caption, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(text, caption); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(text, caption, buttons); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(text, caption, buttons, icon); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(text, caption, buttons, icon, defButton); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(text, caption, buttons, icon, defButton, options); } public static DialogResult Show(IWin32Window owner, string text, uint timeoutSeconds) { Setup("", timeoutSeconds); return MessageBox.Show(owner, text); } public static DialogResult Show(IWin32Window owner, string text, string caption, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(owner, text, caption); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(owner, text, caption, buttons); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(owner, text, caption, buttons, icon); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(owner, text, caption, buttons, icon, defButton); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options, uint timeoutSeconds) { Setup(caption, timeoutSeconds); return MessageBox.Show(owner, text, caption, buttons, icon, defButton, options); } public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam); public delegate void TimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime); public const int WH_CALLWNDPROCRET = 12; public const int WM_DESTROY = 0x0002; public const int WM_INITDIALOG = 0x0110; public const int WM_TIMER = 0x0113; public const int WM_USER = 0x400; public const int DM_GETDEFID = WM_USER + 0; [DllImport("User32.dll")] public static extern UIntPtr SetTimer(IntPtr hWnd, UIntPtr nIDEvent, uint uElapse, TimerProc lpTimerFunc); [DllImport("User32.dll")] public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll")] public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); [DllImport("user32.dll")] public static extern int UnhookWindowsHookEx(IntPtr idHook); [DllImport("user32.dll")] public static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll")] public static extern int GetWindowTextLength(IntPtr hWnd); [DllImport("user32.dll")] public static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int maxLength); [DllImport("user32.dll")] public static extern int EndDialog(IntPtr hDlg, IntPtr nResult); [StructLayout(LayoutKind.Sequential)] public struct CWPRETSTRUCT { public IntPtr lResult; public IntPtr lParam; public IntPtr wParam; public uint message; public IntPtr hwnd; }; private const int TimerID = 42; private static HookProc hookProc; private static TimerProc hookTimer; private static uint hooktimeoutSeconds; private static string hookCaption; private static IntPtr hHook; static MessageBoxEx() { hookProc = new HookProc(MessageBoxHookProc); hookTimer = new TimerProc(MessageBoxTimerProc); hooktimeoutSeconds = 0; hookCaption = null; hHook = IntPtr.Zero; } private static void Setup(string caption, uint timeoutSeconds) { if (hHook != IntPtr.Zero) throw new NotSupportedException("multiple calls are not supported"); hooktimeoutSeconds = timeoutSeconds*1000; hookCaption = caption != null ? caption : ""; //"AppDomain.GetCurrentThreadId()" is obsolete, however, its replacement "Thread.CurrentThread.ManagedThreadId" isn't correct this context. //See: http://stackoverflow.com/questions/772354/appdomain-getcurrentthreadid-vs-thread-managedthreadid-for-windows-api-calls #pragma warning disable 618 //disable the obsolete warning hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId()); //obsolete: #pragma warning restore 618 //enable the obsolete warning } private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam) { if (nCode < 0) return CallNextHookEx(hHook, nCode, wParam, lParam); CWPRETSTRUCT msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT)); IntPtr hook = hHook; if (hookCaption != null && msg.message == WM_INITDIALOG) { int nLength = GetWindowTextLength(msg.hwnd); StringBuilder text = new StringBuilder(nLength + 1); GetWindowText(msg.hwnd, text, text.Capacity); if (hookCaption == text.ToString()) { hookCaption = null; SetTimer(msg.hwnd, (UIntPtr)TimerID, hooktimeoutSeconds, hookTimer); UnhookWindowsHookEx(hHook); hHook = IntPtr.Zero; } } return CallNextHookEx(hook, nCode, wParam, lParam); } private static void MessageBoxTimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime) { if (nIDEvent == (UIntPtr)TimerID) { short dw = (short)SendMessage(hWnd, DM_GETDEFID, IntPtr.Zero, IntPtr.Zero); EndDialog(hWnd, (IntPtr)dw); } } } } using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using NPT.Common; namespace WinFormsIdleTimerTest { public partial class BaseForm : Form { private IdleTimer idleTimer = null; public BaseForm() { InitializeComponent(); } protected int IdleTimeoutSeconds { get; set; } protected virtual void StartIdleTimer() { if (idleTimer == null) { StopIdleTimer(); idleTimer = new IdleTimer(idleTimeoutSeconds: IdleTimeoutSeconds, sychronizingObject: this); idleTimer.IsIdle += new IdleTimer.IsIdleEventHandler(IdleTimer_IsIdle); } idleTimer.Start(); } protected virtual void StopIdleTimer() { if (idleTimer != null) idleTimer.Stop(); } protected virtual void IdleTimer_IsIdle(object sender, IdleTimerEventArgs e) { //handle IsIdle event, close the form (override in inherting classes to do something different) Close(); } public new void Close() { StopIdleTimer(); base.Close(); } public new void Hide() { StopIdleTimer(); base.Hide(); } } } using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using NPT.Common; namespace WinFormsIdleTimerTest { public partial class MainForm : BaseForm { public MainForm() { InitializeComponent(); IdleTimeoutSeconds = 5; StartIdleTimer(); } private void CancelButton_Click(object sender, EventArgs e) { Close(); } protected override void IdleTimer_IsIdle(object sender, IdleTimerEventArgs e) { //an optional override of the BaseForm implementation to do something more than just closing the form //MessageBoxEx is an implementation of MessageBox that dismisses itself after a specified number of seconds var response = MessageBoxEx.Show( "Is there anybody out there?", string.Format("System Idle Detected ({0} seconds)", e.IdleSeconds), MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2, 10); if (response == System.Windows.Forms.DialogResult.No) { MessageBoxEx.Show( "\tGoodbye blue sky.", string.Empty, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1, 3); Close(); return; } StartIdleTimer(); } } } |