Functions/GenXdev.Windows/Get-CurrentFocusedProcess.ps1
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Part of PowerShell module : GenXdev.Windows Original cmdlet filename : Get-CurrentFocusedProcess.ps1 Original author : René Vaessen / GenXdev Version : 1.272.2025 ################################################################################ MIT License Copyright 2021-2025 GenXdev Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ################################################################################> ############################################################################### <# .SYNOPSIS Retrieves the process object of the window that currently has keyboard focus. .DESCRIPTION This function uses Windows API calls through P/Invoke to identify and return the Process object associated with the currently focused window. It leverages the User32.dll functions GetForegroundWindow and GetWindowThreadProcessId to determine which window has focus and obtain its associated process ID. .EXAMPLE $focusedProcess = Get-CurrentFocusedProcess Write-Host "Active window process: $($focusedProcess.ProcessName)" .NOTES Requires Windows operating system as it uses Windows-specific API calls. May return null if the process cannot be accessed due to permissions. ###############################################################################> function Get-CurrentFocusedProcess { [CmdletBinding()] param() begin { # define the windows api functions needed for window handling # this adds two critical User32.dll methods via P/Invoke: # - GetForegroundWindow: gets handle of active window # - GetWindowThreadProcessId: gets process ID from window handle Microsoft.PowerShell.Utility\Add-Type -TypeDefinition @' using System; using System.Runtime.InteropServices; public class User32 { [DllImport("user32.dll")] public static extern IntPtr GetForegroundWindow(); [DllImport("user32.dll")] public static extern int GetWindowThreadProcessId(IntPtr hWnd, out int processId); } '@ } process { # get the handle to the currently active window Microsoft.PowerShell.Utility\Write-Verbose 'Attempting to get foreground window handle' $foregroundWindow = [User32]::GetForegroundWindow() # retrieve the process id associated with the window handle Microsoft.PowerShell.Utility\Write-Verbose 'Getting process ID from window handle' $processId = 0 $null = [User32]::GetWindowThreadProcessId($foregroundWindow, [ref]$processId) # verify we got a valid process id if ($processId -ne 0) { # attempt to get the process object using the process id Microsoft.PowerShell.Utility\Write-Verbose "Retrieving process object for ID: $processId" $process = Microsoft.PowerShell.Management\Get-Process -Id $processId -ErrorAction SilentlyContinue # return the process if found if ($process) { Microsoft.PowerShell.Utility\Write-Verbose "Successfully found process: $($process.ProcessName)" return $process } } Microsoft.PowerShell.Utility\Write-Warning 'Could not retrieve process for the focused window' } end { } } |