How to bring focus to window by process name?

Question

If I'm understanding this correctly this code should capture the active window and keep it in focus. concentr.exe is the process name. How do I bring a window in focus based on process name?

Add-Type @"
using System;
using System.Runtime.InteropServices;
public class UserWindows {
[DllImport("user32.dll")]
public static extern IntPtr GetForegroundWindow();
}
"@            
try {            
$ActiveHandle = [UserWindows]::GetForegroundWindow()
$Process = Get-Process | ? {$_.MainWindowHandle -eq $activeHandle}            
$Process | Select ProcessName, @{Name="concentr.exe";Expression=    {($_.MainWindowTitle)}}            
 } catch {            
 Write-Error "Failed to get active Window details. More Info: $_"            
 }

I've also tried

param([string] $proc="Citrix Connection Manager", [string]$adm)
cls

Add-Type @"
using System;
 using System.Runtime.InteropServices;
 public class WinAp {
 [DllImport("user32.dll")]
 [return: MarshalAs(UnmanagedType.Bool)]
 public static extern bool SetForegroundWindow(IntPtr hWnd);

 [DllImport("user32.dll")]
 [return: MarshalAs(UnmanagedType.Bool)]
 public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
 }

 "@
  $p = Get-Process |where {$_.mainWindowTItle }|where {$_.Name -like   "$proc"}

 if (($p -eq $null) -and ($adm -ne ""))
 {
 Start-Process "$proc" -Verb runAs
 }
 elseif (($p -eq $null) -and ($adm -eq ""))
 {
 Start-Process "$proc" #-Verb runAs
 }
 else
 {
  $h = $p.MainWindowHandle

[void] [WinAp]::SetForegroundWindow($h)
[void] [WinAp]::ShowWindow($h,3);
 }

Answer 1

I found it:

Param(
    [string] $proc="C:\Program Files (x86)\Citrix\ICA Client\concentr.exe",
    [string] $adm
)
Clear-Host

Add-Type @"
    using System;
    using System.Runtime.InteropServices;
    public class WinAp {
      [DllImport("user32.dll")]
      [return: MarshalAs(UnmanagedType.Bool)]
      public static extern bool SetForegroundWindow(IntPtr hWnd);

      [DllImport("user32.dll")]
      [return: MarshalAs(UnmanagedType.Bool)]
      public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
    }
"@
$p = Get-Process | Where {$_.mainWindowTitle} |
    Where {$_.Name -like "$proc"}
if (($p -eq $null) -and ($adm -ne "")) {
    Start-Process "$proc" -Verb runAs
} elseif (($p -eq $null) -and ($adm -eq "")) {
    Start-Process "$proc"
} else {
    $h = $p.MainWindowHandle
    [void] [WinAp]::SetForegroundWindow($h)
    [void] [WinAp]::ShowWindow($h, 3)
}

Answer 2

Have you thought of using the Window Name? I've found this bit of code to work great and not take up a lot of space:

$wshell = New-Object -ComObject wscript.shell
$wshell.AppActivate('New Tab - Google Chrome')

Also, if you need to just Alt-TAB back to the last thing that ran (ie: you need focus to come back to the script window after firing something off) try this:

$wshell = New-Object -ComObject wscript.shell
$wshell.SendKeys('%{TAB}')