WebChecker/FlashWindow.cs

using System.Runtime.InteropServices;
using System;
public static class FlashWindow
{
	[DllImport("user32.dll")]
	[return: MarshalAs(UnmanagedType.Bool)]
	private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
	[StructLayout(LayoutKind.Sequential)]
	private struct FLASHWINFO
	{
		/// <summary>
		/// The size of the structure in bytes.
		/// </summary>
		public uint cbSize;
		/// <summary>
		/// A Handle to the Window to be Flashed. The window can be either opened or minimized.
		/// </summary>
		public IntPtr hwnd;
		/// <summary>
		/// The Flash Status.
		/// </summary>
		public uint dwFlags;
		/// <summary>
		/// The number of times to Flash the window.
		/// </summary>
		public uint uCount;
		/// <summary>
		/// The rate at which the Window is to be flashed, in milliseconds. If Zero, the function uses the default cursor blink rate.
		/// </summary>
		public uint dwTimeout;
	}
	/// <summary>
	/// Stop flashing. The system restores the window to its original stae.
	/// </summary>
	public const uint FLASHW_STOP = 0;

	/// <summary>
	/// Flash the window caption.
	/// </summary>
	public const uint FLASHW_CAPTION = 1;

	/// <summary>
	/// Flash the taskbar button.
	/// </summary>
	public const uint FLASHW_TRAY = 2;

	/// <summary>
	/// Flash both the window caption and taskbar button.
	/// This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags.
	/// </summary>
	public const uint FLASHW_ALL = 3;
	/// <summary>
	/// Flash continuously, until the FLASHW_STOP flag is set.
	/// </summary>
	public const uint FLASHW_TIMER = 4;
	/// <summary>
	/// Flash continuously until the window comes to the foreground.
	/// </summary>
	public const uint FLASHW_TIMERNOFG = 12;

	/// <summary>
	/// Flash the spacified Window (Form) until it recieves focus.
	/// </summary>
	/// <param name="form">The Form (Window) to Flash.</param>
	/// <returns></returns>
	public static bool Flash(System.Windows.Forms.Form form)
	{
		// Make sure we're running under Windows 2000 or later
		if(Win2000OrLater)
		{
			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_ALL | FLASHW_TIMERNOFG, uint.MaxValue, 0);
			return FlashWindowEx(ref fi);
		}
		return false;
	}
	private static FLASHWINFO Create_FLASHWINFO(IntPtr handle, uint flags, uint count, uint timeout)
	{
		FLASHWINFO fi = new FLASHWINFO();
		fi.cbSize = Convert.ToUInt32(Marshal.SizeOf(fi));
		fi.hwnd = handle;
		fi.dwFlags = flags;
		fi.uCount = count;
		fi.dwTimeout = timeout;
		return fi;
	}
	/// <summary>
	/// Flash the specified Window (form) for the specified number of times
	/// </summary>
	/// <param name="form">The Form (Window) to Flash.</param>
	/// <param name="count">The number of times to Flash.</param>
	/// <returns></returns>
	public static bool Flash(System.Windows.Forms.Form form, uint count)
	{
		if(Win2000OrLater)
		{
			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_ALL, count, 0);
			return FlashWindowEx(ref fi);
		}
		return false;
	}
	/// <summary>
	/// Start Flashing the specified Window (form)
	/// </summary>
	/// <param name="form">The Form (Window) to Flash.</param>
	/// <returns></returns>
	public static bool Start(System.Windows.Forms.Form form)
	{
		if(Win2000OrLater)
		{
			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_ALL, uint.MaxValue, 0);
			return FlashWindowEx(ref fi);
		}
		return false;
	}
	/// <summary>
	/// Stop Flashing the specified Window (form)
	/// </summary>
	/// <param name="form"></param>
	/// <returns></returns>
	public static bool Stop(System.Windows.Forms.Form form)
	{
		if(Win2000OrLater)
		{
			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_STOP, uint.MaxValue, 0);
			return FlashWindowEx(ref fi);
		}
		return false;
	}
	/// <summary>
	/// A boolean value indicating whether the application is running on Windows 2000 or later.
	/// </summary>
	private static bool Win2000OrLater
	{
		get { return System.Environment.OSVersion.Version.Major >= 5; }
	}
}