using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Collections;
using System.Diagnostics;

namespace C井获取进程的主窗口句柄
{
    public class User32API
    {
        private static Hashtable processWnd = null;

        public delegate bool WNDENUMPROC(IntPtr hwnd, uint lParam);

        static User32API()
        {
            if (processWnd == null)
            {
                processWnd = new Hashtable();
            }
        }

        [DllImport("user32.dll", EntryPoint = "EnumWindows", SetLastError = true)]
        public static extern bool EnumWindows(WNDENUMPROC lpEnumFunc, uint lParam);

        [DllImport("user32.dll", EntryPoint = "GetParent", SetLastError = true)]
        public static extern IntPtr GetParent(IntPtr hWnd);

        [DllImport("user32.dll", EntryPoint = "GetWindowThreadProcessId")]
        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, ref uint lpdwProcessId);

        [DllImport("user32.dll", EntryPoint = "IsWindow")]
        public static extern bool IsWindow(IntPtr hWnd);

        [DllImport("kernel32.dll", EntryPoint = "SetLastError")]
        public static extern void SetLastError(uint dwErrCode);

        public static IntPtr GetCurrentWindowHandle()
        {
            IntPtr ptrWnd = IntPtr.Zero;
            uint uiPid = (uint)Process.GetCurrentProcess().Id;  // 当前进程 ID
            object objWnd = processWnd[uiPid];

            if (objWnd != null)
            {
                ptrWnd = (IntPtr)objWnd;
                if (ptrWnd != IntPtr.Zero && IsWindow(ptrWnd))  // 从缓存中获取句柄
                {
                    return ptrWnd;
                }
                else
                {
                &nbs