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

namespace HwndTest
{
    public static class Win32API
    {
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern uint RegisterWindowMessage(string lpString);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern IntPtr SendMessageTimeout(
            IntPtr hWnd,
            uint Msg,
            UIntPtr wParam,
            IntPtr lParam,
            SendMessageTimeoutFlags fuFlags,
            uint uTimeout,
            out UIntPtr lpdwResult);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern IntPtr SendMessageTimeout(
            IntPtr windowHandle,
            uint Msg,
            IntPtr wParam,
            IntPtr lParam,
            SendMessageTimeoutFlags flags,
            uint timeout,
            out IntPtr result);

        [DllImport("oleacc.dll", PreserveSig = false)]
        [return: MarshalAs(UnmanagedType.Interface)]
        static extern object ObjectFromLresult(UIntPtr lResult,
             [MarshalAs(UnmanagedType.LPStruct)] Guid refiid, IntPtr wParam);

        [DllImport("oleacc.dll", PreserveSig = false)]
        [return: MarshalAs(UnmanagedType.Interface)]
        static extern object ObjectFromLresult(IntPtr lResult,
             [MarshalAs(UnmanagedType.LPStruct)] Guid refiid, IntPtr wParam);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

        /// <summary>
        /// 根据类名称和窗口名称查找窗口
        /// </summary>
        /// <param name="lpClassName">窗口类名称</param>
        /// <param name="lpWindowName">窗口标题名称</param>
        /// <returns>窗口句柄</returns>
        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        /// <summary>
        /// 根据标题查找窗口，第一个参数必须为IntPtr.Zero
        /// </summary>
        /// <param name="ZeroOnly">必须为空</param>
        /// <param name="lpWindowName">窗口标题名称</param>
        /// <returns>窗口句柄</returns>
        [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
        static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);

        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern int GetWindowTextLength(IntPtr hWnd);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool EnumWindows(EnumWindows