Reading Text out of a Textbox using user32.dll

[decrypt]

I'm trying to read text out of google talks chat window, but I can't seem to figure out how. This is my current code:

 

[DllImport("user32.dll",EntryPoint="FindWindow")]
	public static extern int FindWindow(string _ClassName, string _WindowName);
	[DllImport("user32.dll",EntryPoint="FindWindowEx")]
	public static extern int FindWindowEx(int hWnd1, int hWnd2, string lpsz1, int lpsz2);
	[DllImport("user32.dll",EntryPoint="SendMessage")]
	public static extern int SendMessage(int _WindowHandler, int _WM_USER, int _data, int _id);
	[DllImport("user32.dll",EntryPoint="SendMessage")]
	public static extern int SendMessage(int _WindowHandler, int _WM_USER, int _data, string _id);
	[DllImport("User32.dll")]
	public static extern bool SetForegroundWindow(int hWnd);

public void GetText()
	{
		int Handler = FindWindow("Chat View",null);
		if (Handler > 0)
		{
			int Alt = FindWindowEx(Handler, 0, "AtlAxWin71", 0);
			if(Alt > 0)
			{
				int IES = FindWindowEx(Alt, 0, "Internet Explorer_Server", 0);
				if(IES > 0)
				{
					MessageBox.Show(SendMessage(IES, (int) WMDefs.WM_GETTEXTLENGTH, 0, 0).ToString());
					SetForegroundWindow(Handler);
				}
				else
				{
					MessageBox.Show("Cannot find IES");
				}
			}
			else
			{
				MessageBox.Show("Cannot find alt");
			}
		}
		else
		{
			MessageBox.Show("A Google Talk chat window is not open","Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
		}
	}

 

The text length is 0. Is there a way to get the text out of the chat window?