c#控制windows messenger和windows live messenger窗口发送消息_c#应用

前端时间做了Messenger助手，后来发现只支持Windows Messenger，不支持Windows Live Messenger，最近改了一下，用到了Active Accessibility编程，代码如下：
using System;
using Accessibility;

namespace MessengerHelper
{
/**//// <summary>
/// 对Messenger窗口进行操作
/// </summary>
public class MessengerWindowHelper
{
IntPtr _messengerWindowHandle ;
IntPtr _inputBoxHandle ;
IntPtr _submitButtonHandle ;
IAccessible _inputBox ;
IAccessible _submitButton ;

private MessengerWindowHelper(){}
public MessengerWindowHelper(IntPtr windowHandle)
{
_messengerWindowHandle = windowHandle ;
_inputBoxHandle = GetInputBoxHandle() ;
_submitButtonHandle = GetSubmitButton() ;

if (_inputBoxHandle == IntPtr.Zero && _submitButtonHandle == IntPtr.Zero)
{
GetAccessibleObjects(_messengerWindowHandle, out _inputBox, out _submitButton);
}
}

/**//// <summary>
/// 输入消息
/// </summary>
/// <param name="message"></param>
public void InputMessage(string message)
{
if (_inputBox == null)
{
Win32.SendMessageString(_inputBoxHandle, Win32.WM_SETTEXT, IntPtr.Zero, message);
}
else
{
_inputBox.set_accValue(Win32.CHILDID_SELF, message) ;
}
}

/**//// <summary>
/// 发送消息
/// </summary>
public void SendMessage()
{
if (_submitButton == null)
{
Win32.SendMessageInt(_submitButtonHandle, Win32.WM_CLICK, IntPtr.Zero, 0);
}
else
{
_submitButton.accDoDefaultAction(Win32.CHILDID_SELF) ;
}
}

private IntPtr GetInputBoxHandle()
{
IntPtr topInputHandle = Win32.FindWindowEx(_messengerWindowHandle, System.IntPtr.Zero, "RichEdit20W", null) ;
return Win32.FindWindowEx(_messengerWindowHandle, topInputHandle, "RichEdit20W", null) ;
}

private IntPtr GetSubmitButton()
{
return Win32.FindWindowEx(_messengerWindowHandle, System.IntPtr.Zero, "Button", "发送(&S)") ;
}

private object[] GetAccessibleChildren(IAccessible paccContainer)
{
object[] rgvarChildren = new object[paccContainer.accChildCount] ;
int pcObtained ;
　　 Win32.AccessibleChildren(paccContainer,0,paccContainer.accChildCount, rgvarChildren, out pcObtained);
return rgvarChildren ;
}

private void GetAccessibleObjects(System.IntPtr imWindowHwnd, out IAccessible inputBox, out IAccessible submitButtion)
{
System.IntPtr ptrUIHWND = Win32.FindWindowEx(imWindowHwnd, System.IntPtr.Zero, "DirectUIHWND", 0);
Guid guidCOM = new Guid(0x618736E0,0x3C3D,0x11CF,0x81,0xC,0x0,0xAA,0x0,0x38,0x9B,0x71);
Accessibility.IAccessible IACurrent = null;

Win32.AccessibleObjectFromWindow(ptrUIHWND,(int)Win32.OBJID_CLIENT,ref guidCOM,ref IACurrent);
IACurrent = (IAccessible)IACurrent.accParent;
int childCount = IACurrent.accChildCount;
object[] windowChildren = new object[childCount];
int pcObtained;
Win32.AccessibleChildren(IACurrent, 0, childCount, windowChildren, out pcObtained);

inputBox = null ;
submitButtion = null ;

string accName ;
int accRole ;
foreach(IAccessible child in windowChildren)
{
accRole = (int)child.get_accRole(Win32.CHILDID_SELF) ;
accName = child.get_accName(Win32.CHILDID_SELF) ;
if (accRole == 10)
{
object[] clientChilren = GetAccessibleChildren(child) ;
IAccessible client = (IAccessible)clientChilren[0] ;
clientChilren = GetAccessibleChildren(client) ;

foreach (IAccessible childChild in clientChilren)
{
accRole = (int)childChild.get_accRole(Win32.CHILDID_SELF) ;
accName = childChild.get_accName(Win32.CHILDID_SELF) ;

if (accRole == 42 && accName == "输入")
{
inputBox = childChild ;
}

if (accRole == 43 && accName == "发送按钮")

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