Function to set the foreground window in Windows using the user32.dll API

Set-ForegroundWindow.ps1

function Set-ForegroundWindow {
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline)][string]$ProcessName
    )

    $type = '
        using System;
        using System.Runtime.InteropServices;
        public class WinAp {
            [DllImport("user32.dll")]
            public static extern bool SetForegroundWindow(IntPtr hWnd);
    
            [DllImport("user32.dll")]
            public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
        }'

    Add-Type $type

    # Pick the first window that matches this process
    $h = (Get-Process -Name $ProcessName | ? MainWindowTitle | select -First 1).MainWindowHandle

    # If you can't find the window, exit
    if ($null -eq $h) { return }

    # https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-showwindow
    # 2 = Minimize window
    [WinAp]::ShowWindow($h, 2) # minimize it first...this is a hack so that we maintain snapped window positions
    # 4 or 9 = Restore window, these are the only ones that seem to work predictably.
    # They will restore a window to its original position if it is minimized, even if the window was snapped
    # However, if the window is not minimized but is only out of focus, then it will unsnap the window.
    # This is why we first minimize it, then restore it. It's hacky, but it works. It just looks a little funny.
    [WinAp]::ShowWindow($h, 4)
    
    # Bring window into focus
    [WinAp]::SetForegroundWindow($h)
}

# Credit to this SO Answer:
# https://stackoverflow.com/a/42567337/3474677

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