GenXdev

3.28.2026

Functions/GenXdev.Windows/Set-ForegroundWindow.cs

// ################################################################################
// Part of PowerShell module : GenXdev.Windows
// Original cmdlet filename : Set-ForegroundWindow.cs
// Original author : René Vaessen / GenXdev
// Version : 3.28.2026
// ################################################################################
// Copyright (c) 2026 René Vaessen / GenXdev
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ################################################################################



using System.Runtime.InteropServices;
using System.Management.Automation;

namespace GenXdev.Windows
{
    [System.ComponentModel.Description(@"
.SYNOPSIS
Brings the specified window to the foreground and makes it the active
window.
.DESCRIPTION
* Makes a window the foreground window using multiple Win32 API methods for
  maximum reliability.
* First attempts using SwitchToThisWindow API, then falls back to
  SetForegroundWindow if needed.
.EXAMPLE
```powershell
$hwnd = (Get-Process notepad).MainWindowHandle
Set-ForegroundWindow -WindowHandle $hwnd
```

Brings a Notepad window to the foreground using the window handle.
.EXAMPLE
```powershell
$hwnd = (Get-Process notepad).MainWindowHandle
Set-ForegroundWindow $hwnd
```

Uses positional parameter for concise syntax.
")]
    [Cmdlet(VerbsCommon.Set, "ForegroundWindow")]
    public class SetForegroundWindowCommand : PSGenXdevCmdlet
    {
        /// <summary>
        /// An IntPtr handle to the target window. This handle can be obtained from Windows
        /// API calls or PowerShell window management functions like Get-Process
        /// MainWindowHandle.
        /// </summary>
        [Parameter(
            Mandatory = true,
            Position = 0,
            HelpMessage = "Window handle to set as foreground window")]
        public IntPtr WindowHandle { get; set; }

        /// <summary>
        /// P/Invoke declaration for SwitchToThisWindow API
        /// </summary>
        [DllImport("user32.dll")]
        private static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

        /// <summary>
        /// P/Invoke declaration for SetForegroundWindow API
        /// </summary>
        [DllImport("user32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);

        /// <summary>
        /// Begin processing - initialization logic
        /// </summary>
        protected override void BeginProcessing()
        {
            // Log the activation attempt with the window handle
            WriteVerbose($"Attempting to set foreground window for handle: {WindowHandle}");
        }

        /// <summary>
        /// Process record - main cmdlet logic
        /// </summary>
        protected override void ProcessRecord()
        {
            if (ShouldProcess($"Window {WindowHandle}", "Set as foreground window"))
            {
                try
                {
                    // Try the preferred SwitchToThisWindow API first as it's more reliable
                    WriteVerbose("Attempting primary method: SwitchToThisWindow...");
                    SwitchToThisWindow(WindowHandle, false);
                }
                catch (Exception ex)
                {
                    // Log failure of primary activation method
                    WriteVerbose($"SwitchToThisWindow failed: {ex.Message}");
                }

                try
                {
                    // Attempt SetForegroundWindow as fallback if first method failed
                    WriteVerbose("Attempting fallback method: SetForegroundWindow...");
                    SetForegroundWindow(WindowHandle);
                }
                catch (Exception ex)
                {
                    // Log failure of backup activation method
                    WriteVerbose($"SetForegroundWindow failed: {ex.Message}");
                }
            }
        }

        /// <summary>
        /// End processing - cleanup logic
        /// </summary>
        protected override void EndProcessing()
        {
            // No cleanup needed
        }
    }
}