假设在得到窗体中控件的句柄（通过SPY++）的前提下，如果是像文本框这种控件，只要用SendMessage就可得到文本了，但是对于聊天记录窗口却行不通（返回空值），因为那其实是一个内置浏览器Internet Explorer_Server
经查询，可用以下方式获取：
先引用：mshtml
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using mshtml; [Flags]
public enum SendMessageTimeoutFlags : uint
{
SMTO_NORMAL = 0x0,
SMTO_BLOCK = 0x1,
SMTO_ABORTIFHUNG = 0x2,
SMTO_NOTIMEOUTIFNOTHUNG = 0x8
} public class WinAPI
{
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern uint RegisterWindowMessage(string lpString); [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern IntPtr SendMessageTimeout(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam, SendMessageTimeoutFlags flags, uint timeout, out UIntPtr result); [DllImport("oleacc.dll", PreserveSig = false)]
[return: MarshalAs(UnmanagedType.Interface)]
private static extern object ObjectFromLresult(UIntPtr lResult, [MarshalAs(UnmanagedType.LPStruct)] Guid refiid, IntPtr wParam); public IHTMLDocument2 GetHtmlDocument(IntPtr hWnd)
{
uint lMsg = RegisterWindowMessage("WM_HTML_GETOBJECT"); UIntPtr lRes;
SendMessageTimeout(hWnd, lMsg, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_ABORTIFHUNG, , out lRes); IHTMLDocument2 htmlDoc = null;
if (lRes != UIntPtr.Zero)
{
htmlDoc = (IHTMLDocument2)ObjectFromLresult(lRes, typeof(IHTMLDocument2).GUID, IntPtr.Zero);
} return htmlDoc;
} public string GetWebText(IntPtr hWnd)
{
IHTMLDocument2 htmlDoc = GetHtmlDocument(hWnd);
if (htmlDoc != null)
{
return htmlDoc.body.innerHTML;
}
else
{
return string.Empty;
}
}
}