WPF 任务栏图标闪烁提醒

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Runtime.InteropServices;
  5 using System.Text;
  6 using System.Windows;
  7 using System.Windows.Interop;
  8 
  9 
 10 public static class FlashWindow
 11 {
 12     [DllImport("user32.dll")]
 13     [return: MarshalAs(UnmanagedType.Bool)]
 14     private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
 15 
 16     [StructLayout(LayoutKind.Sequential)]
 17     private struct FLASHWINFO
 18     {
 19         /// <summary>
 20         /// The size of the structure in bytes.
 21         /// </summary>
 22         public uint cbSize;
 23 
 24         /// <summary>
 25         /// A Handle to the Window to be Flashed. The window can be either opened or minimized.
 26         /// </summary>
 27         public IntPtr hwnd;
 28 
 29         /// <summary>
 30         /// The Flash Status.
 31         /// </summary>
 32         public uint dwFlags;
 33 
 34         /// <summary>
 35         /// The number of times to Flash the window.
 36         /// </summary>
 37         public uint uCount;
 38 
 39         /// <summary>
 40         /// The rate at which the Window is to be flashed, in milliseconds. If Zero, the function uses the default cursor blink rate.
 41         /// </summary>
 42         public uint dwTimeout;
 43     }
 44 
 45     /// <summary>
 46     /// Stop flashing. The system restores the window to its original stae.
 47     /// </summary>
 48     public const uint FLASHW_STOP = 0;
 49 
 50     /// <summary>
 51     /// Flash the window caption.
 52     /// </summary>
 53     public const uint FLASHW_CAPTION = 1;
 54 
 55     /// <summary>
 56     /// Flash the taskbar button.
 57     /// </summary>
 58     public const uint FLASHW_TRAY = 2;
 59 
 60     /// <summary>
 61     /// Flash both the window caption and taskbar button.
 62     /// This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags.
 63     /// </summary>
 64     public const uint FLASHW_ALL = 3;
 65 
 66     /// <summary>
 67     /// Flash continuously, until the FLASHW_STOP flag is set.
 68     /// </summary>
 69     public const uint FLASHW_TIMER = 4;
 70 
 71     /// <summary>
 72     /// Flash continuously until the window comes to the foreground.
 73     /// </summary>
 74     public const uint FLASHW_TIMERNOFG = 12;
 75 
 76 
 77     /// <summary>
 78     /// Flash the spacified Window (Form) until it recieves focus.
 79     /// </summary>
 80     /// <param name="form">The Form (Window) to Flash.</param>
 81     /// <returns></returns>
 82     public static bool Flash(Window w)
 83     {
 84         // Make sure we're running under Windows 2000 or later
 85         if (Win2000OrLater)
 86         {
 87             FLASHWINFO fi = Create_FLASHWINFO(new WindowInteropHelper(w).Handle, FLASHW_ALL | FLASHW_TIMERNOFG, uint.MaxValue, 0);
 88             return FlashWindowEx(ref fi);
 89         }
 90         return false;
 91     }
 92 
 93     private static FLASHWINFO Create_FLASHWINFO(IntPtr handle, uint flags, uint count, uint timeout)
 94     {
 95         FLASHWINFO fi = new FLASHWINFO();
 96         fi.cbSize = Convert.ToUInt32(Marshal.SizeOf(fi));
 97         fi.hwnd = handle;
 98         fi.dwFlags = flags;
 99         fi.uCount = count;
100         fi.dwTimeout = timeout;
101         return fi;
102     }
103 
104     /// <summary>
105     /// Flash the specified Window (form) for the specified number of times
106     /// </summary>
107     /// <param name="form">The Form (Window) to Flash.</param>
108     /// <param name="count">The number of times to Flash.</param>
109     /// <returns></returns>
110     public static bool Flash(Window w, uint count)
111     {
112         if (Win2000OrLater)
113         {
114             FLASHWINFO fi = Create_FLASHWINFO(new WindowInteropHelper(w).Handle, FLASHW_ALL, count, 0);
115             return FlashWindowEx(ref fi);
116         }
117         return false;
118     }
119 
120     /// <summary>
121     /// Start Flashing the specified Window (form)
122     /// </summary>
123     /// <param name="form">The Form (Window) to Flash.</param>
124     /// <returns></returns>
125     public static bool Start(Window w)
126     {
127         if (Win2000OrLater)
128         {
129             var fi = Create_FLASHWINFO(new WindowInteropHelper(w).Handle, FLASHW_ALL, uint.MaxValue, 0);
130             return FlashWindowEx(ref fi);
131         }
132         return false;
133     }
134 
135     /// <summary>
136     /// Stop Flashing the specified Window (form)
137     /// </summary>
138     /// <param name="form"></param>
139     /// <returns></returns>
140     public static bool Stop(Window w)
141     {
142         if (Win2000OrLater)
143         {
144             var fi = Create_FLASHWINFO(new WindowInteropHelper(w).Handle, FLASHW_STOP, uint.MaxValue, 0);
145             return FlashWindowEx(ref fi);
146         }
147         return false;
148     }
149 
150     /// <summary>
151     /// A boolean value indicating whether the application is running on Windows 2000 or later.
152     /// </summary>
153     private static bool Win2000OrLater
154     {
155         get { return System.Environment.OSVersion.Version.Major >= 5; }
156     }
157 }