如何调用FindWindow API获取主窗体

using System;

using System.Collections.Generic;

using System.Runtime.InteropServices;

using System.Text;

namespace HtmlShow

{

    /**/

    /// <summary>

    /// This class is to find the given window's child window accroding to the given child window's name.

    /// The useage: FindWindow fw = new FindWindow(wndHandle, "ChildwndClassName"); IntPtr ip = fw.FoundHandle;

    /// I adapt the code from Paul DiLascia,who is the MSDN Magazine's writer.

    /// The original class is named CFindWnd which is written in C++, and you could get it on Internet.

    /// www.pinvoke.net is a great website.It includes almost all the API fuctoin to be used in C#.

    /// </summary>

    class FindWindow

    {

        [DllImport("user32")]

        [return: MarshalAs(UnmanagedType.Bool)]

        //IMPORTANT : LPARAM  must be a pointer (InterPtr) in VS2005, otherwise an exception will be thrown

        private static extern bool EnumChildWindows(IntPtr window, EnumWindowProc callback, IntPtr i);

        //the callback function for the EnumChildWindows

        private delegate bool EnumWindowProc(IntPtr hWnd, IntPtr parameter);

        //if found  return the handle , otherwise return IntPtr.Zero

        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]

        private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

        private string m_classname; // class name to look for

        private IntPtr m_hWnd; // HWND if found

        public IntPtr FoundHandle

        {

            get { return m_hWnd; }

        }

        // ctor does the work--just instantiate and go

        public FindWindow(IntPtr hwndParent, string classname)

        {

            m_hWnd = IntPtr.Zero;

            m_classname = classname;

            FindChildClassHwnd(hwndParent, IntPtr.Zero);

        }

        //EnumChildWindows是API函数，能够遍历主窗口下所有子窗口。不过它的遍历过程是通过

        //第二个参数即回调函数与程序员交互的。EnumChildWindows每找到一个窗口。就调用回调

        //函数。回调函数如果返回false。遍历就会结束。

        /**/

        /// <summary>

        /// Find the child window, if found m_classname will be assigned 

        /// </summary>

        /// <param name="hwndParent">parent's handle</param>

        /// <param name="lParam">the application value, nonuse</param>

        /// <returns>found or not found</returns>

        //The C++ code is that  lParam is the instance of FindWindow class , if found assign the instance's m_hWnd

        private bool FindChildClassHwnd(IntPtr hwndParent, IntPtr lParam)

        {

            EnumWindowProc childProc = new EnumWindowProc(FindChildClassHwnd);

            IntPtr hwnd = FindWindowEx(hwndParent, IntPtr.Zero, this.m_classname, string.Empty);

            if (hwnd != IntPtr.Zero)

            {

                this.m_hWnd = hwnd; // found: save it

                return false; // stop enumerating

            }

            EnumChildWindows(hwndParent, childProc, IntPtr.Zero); // recurse  redo FindChildClassHwnd

            return true;// keep looking

        }

    }

}

 //this.Handle是要查找窗口的父窗口，因为我使用的是webBrowser控件

 FindWindow fw = new FindWindow(this.Handle, "Internet Explorer_Server");

 hIE = fw.FoundHandle;