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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved
//
//
// Abstract:
//
// This file contains helper methods that provide a friendly way to access win32 window functions.
using System;
using System.Runtime.InteropServices;
namespace Microsoft.Samples.Printing.PrinterExtension.Helpers
{
class WindowHelper
{
/// <summary>
/// P/Invoke signature for Win32 function "SetForegroundWindow".
/// </summary>
/// <param name="hwnd">Handle to window</param>
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("User32", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
public static extern bool SetForegroundWindow(IntPtr hwnd);
/// <summary>
/// Wrapper for Win32 function "FlashWindowEx"
/// </summary>
/// <param name="hWnd">Handle of the window to flash</param>
public static bool FlashWindow(IntPtr hWnd)
{
FLASHWINFO fInfo = new FLASHWINFO();
fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo));
fInfo.hwnd = hWnd; // Handle to window
fInfo.uCount = UInt32.MaxValue; // Number of times to flash
fInfo.dwTimeout = 0; // Use default cursor blink rate
// Flash both window caption and taskbar button, until the window is brought to the foreground.
fInfo.dwFlags = (uint)(FLASHW.ALL | FLASHW.TIMERNOFG);
return FlashWindowEx(ref fInfo);
}
#region private members
/// <summary>
/// P/Invoke signature for Win32 function "FlashWindowEx".
/// </summary>
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("User32", CharSet = CharSet.Auto, SetLastError = false, ExactSpelling = true)]
private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
[StructLayout(LayoutKind.Sequential)]
private struct FLASHWINFO
{
public UInt32 cbSize;
public IntPtr hwnd;
public UInt32 dwFlags;
public UInt32 uCount;
public UInt32 dwTimeout;
}
/// <summary>
/// Represents the FLASH_Xxx flags
/// </summary>
[Flags]
private enum FLASHW : uint
{
/// <summary>
/// Flash both the window caption and taskbar button
/// </summary>
ALL = 3,
/// <summary>
/// Flash continuously until the window comes to the foreground.
/// </summary>
TIMERNOFG = 12
}
#endregion
}
}
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