### Use: Stop annoying flashing of windows.
### Author: xxxxxxxxxx
### Date: Apr 24 2017
### Ver: 1
### Source: http://pinvoke.net/default.aspx/user32/FlashWindowEx.html

Add-Type -TypeDefinition @"
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

public class Window
{
    [StructLayout(LayoutKind.Sequential)]
    public struct FLASHWINFO
    {
        public UInt32 cbSize;
        public IntPtr hwnd;
        public UInt32 dwFlags;
        public UInt32 uCount;
        public UInt32 dwTimeout;
    }

    //Stop flashing. The system restores the window to its original state. 
    const UInt32 FLASHW_STOP = 0;
    //Flash the window caption. 
    const UInt32 FLASHW_CAPTION = 1;
    //Flash the taskbar button. 
    const UInt32 FLASHW_TRAY = 2;
    //Flash both the window caption and taskbar button.
    //This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags. 
    const UInt32 FLASHW_ALL = 3;
    //Flash continuously, until the FLASHW_STOP flag is set. 
    const UInt32 FLASHW_TIMER = 4;
    //Flash continuously until the window comes to the foreground. 
    const UInt32 FLASHW_TIMERNOFG = 12;


    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool FlashWindowEx(ref FLASHWINFO pwfi);

    public static bool FlashWindow(IntPtr handle, UInt32 timeout, UInt32 count)
    {
        IntPtr hWnd = handle;
        FLASHWINFO fInfo = new FLASHWINFO();

        fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo));
        fInfo.hwnd = hWnd;
        fInfo.dwFlags = FLASHW_ALL; //| FLASHW_TIMERNOFG;
        fInfo.uCount = count;
        fInfo.dwTimeout = timeout;

        return FlashWindowEx(ref fInfo);
    }

    public static bool StopFlashWindow(IntPtr handle)
    {
        IntPtr hWnd = handle;
        FLASHWINFO fInfo = new FLASHWINFO();

        fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo));
        fInfo.hwnd = hWnd;
        fInfo.dwFlags = FLASHW_STOP;

        return FlashWindowEx(ref fInfo);
    }
}
"@

[int]$Duration = Read-Host "Minutes to suppress flashes [30]"
if($Duration -eq ""){
    $Duration = 30
}

[int]$TargetWindowName = Read-Host "Enter the name of the program to suppress [All]"
if($TargetWindowName -eq ""){
    $TargetWindowName = 's_AllPrograms'
}

$StartTime = Get-Date

while((New-TimeSpan -Start $StartTime -End (Get-Date)).Minutes -lt $Duration){
    if($TargetWindowName -eq "s_AllPrograms"){
        (Get-Process).MainWindowHandle | % {[Window]::StopFlashWindow($_)} > $null
        Write-Host "Stopping all flashing of task windows for another $($Duration - (New-TimeSpan -Start $StartTime -End (Get-Date)).Minutes) Minutes..."
    }
    else{
        (Get-Process -Name $TargetWindowName).MainWindowHandle | % {[Window]::StopFlashWindow($_)} > $null
        Write-Host "Stopping $TargetWindowName from flashing for another $($Duration - (New-TimeSpan -Start $StartTime -End (Get-Date)).Minutes) Minutes..."
    }
    cls
    
    Start-Sleep -Seconds 1
}

Write-Host "Timed out, job finished..." -fo Green