Carnac/Utilities/ProcessUtilities.cs

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using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;

namespace Carnac.Utilities
{
    public static class ProcessUtilities
    {
        private static Mutex mutex = null;

        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        static extern bool IsIconic(IntPtr hWnd);

        [DllImport("user32.dll")]
        static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        const int SW_RESTORE = 9;

        [DllImport("user32.dll")]
        static extern IntPtr GetLastActivePopup(IntPtr hWnd);

        [DllImport("user32.dll")]
        static extern bool IsWindowEnabled(IntPtr hWnd);

        /// Determine if the current process is already running
        public static bool ThisProcessIsAlreadyRunning()
        {
            bool createdNew;
            mutex = new Mutex(false, Application.Current.MainWindow.GetType().Assembly.FullName, out createdNew);
            return !createdNew;
        }

        /// Set focus to the previous instance of the specified program.
        public static void SetFocusToPreviousInstance(string windowCaptionPart)
        {
            var hWnd = IntPtr.Zero;
            foreach (var process in Process.GetProcesses())
            {
                if (process.MainWindowTitle.Contains(windowCaptionPart))
                {
                    hWnd = process.MainWindowHandle;
                }
            }
            // Look for previous instance of this program.
            //IntPtr  = FindWindow(null, windowCaption);
            // If a previous instance of this program was found...
            if (hWnd != null)
            {
                // Is it displaying a popup window?
                var hPopupWnd = GetLastActivePopup(hWnd);
                // If so, set focus to the popup window. Otherwise set focus