C# Signature:
[DllImport("user32.dll")]
static extern Int16 FlashWindowEx(ref FLASHWINFO pwfi);
User-Defined Types:
[StructLayout(LayoutKind.Sequential)]
public struct FLASHWINFO
{
public UInt16 cbSize;
public IntPtr hwnd;
public UInt32 dwFlags;
public UInt16 uCount;
public UInt32 dwTimeout;
}
Notes:
//Stop flashing. The system restores the window to its original state.
public const UInt32 FLASHW_STOP = 0;
//Flash the window caption.
public const UInt32 FLASHW_CAPTION = 1;
//Flash the taskbar button.
public const UInt32 FLASHW_TRAY = 2;
//Flash both the window caption and taskbar button.
//This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags.
public const UInt32 FLASHW_ALL = 3;
//Flash continuously, until the FLASHW_STOP flag is set.
public const UInt32 FLASHW_TIMER = 4;
//Flash continuously until the window comes to the foreground.
public const UInt32 FLASHW_TIMERNOFG = 12;
Tips & Tricks:
Please add some!
Sample Code:
/// <summary>
/// Flashes a window
/// </summary>
/// <param name="hWnd">The handle to the window to flash</param>
/// <returns>whether or not the window needed flashing</returns>
public static bool FlashWindowEx(IntPtr hWnd)
{
FLASHWINFO fInfo = new FLASHWINFO();
fInfo.cbSize = (ushort)Marshal.SizeOf(fInfo);
fInfo.hwnd = hWnd;
fInfo.dwFlags = FLASHW_ALL;
fInfo.uCount = UInt16.MaxValue;
fInfo.dwTimeout = 0;
return (FlashWindowEx(ref fInfo) == 0);
}
...
if (!FlashWindowEx(someForm.Handle))
{
//The window was already active
}
/// Minor adjust to the code above
/// <summary>
/// Flashes a window until the window comes to the foreground
/// </summary>
/// <param name="hWnd">The handle to the window to flash</param>
/// <returns>whether or not the window needed flashing</returns>
public static bool FlashWindowEx(IntPtr hWnd)
{
FLASHWINFO fInfo = new FLASHWINFO();
fInfo.cbSize = (ushort)Marshal.SizeOf(fInfo);
fInfo.hwnd = hWnd;
fInfo.dwFlags = FLASHW_ALL | FLASHW_TIMERNOFG;
fInfo.uCount = UInt16.MaxValue;
fInfo.dwTimeout = 0;
return (FlashWindowEx(ref fInfo) == 0);
}
Alternative Managed API:
Do you know one? Please contribute it!
