API问题 高手帮帮忙

Question

 private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = ConnectLan();
        }
        public string ConnectLan()
        {
            Process p;
            p = new Process();
            p.StartInfo.FileName = "cmd.exe";
            //   这里是关键点,不用Shell启动/重定向输入/重定向输出/不显示窗口   
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.CreateNoWindow = true;            p.Start();
            p.StandardInput.WriteLine("net   use   \\\\miss\\rising$\\rav       aaa     /user:aaa");//   向cmd.exe输入command   
            p.StandardInput.WriteLine("exit");
            p.WaitForExit();
            string s = p.StandardOutput.ReadToEnd();//   得到cmd.exe的输出   
            p.Close();
            return s;        }        [DllImport("User32.dll")]
        public static extern IntPtr FindWindowEx(IntPtr hWnd1, IntPtr hWnd2, string lpsz1, string lpsz2);        [DllImport("User32.dll")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        
        [DllImport("User32.dll")]
        public static extern IntPtr EnableWindow(IntPtr hwnd, bool fEnable); 
        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                ProcessStartInfo p = null;
                Process Proc;
                p = new ProcessStartInfo("Setup.exe", "-update");
                p.WorkingDirectory = @"d:\\Program Files\rising\rav\Update";                
                Proc = Process.Start(p）；                  
                  IntPtr h1 =new IntPtr(0); 
                IntPtr h2 =new IntPtr(0);
                bool bEnable = true;
                h1 = FindWindow(null, "瑞星杀毒软件"); 
               
                  if (h1 != IntPtr.Zero)
                {
                    h2 = FindWindowEx(h1, IntPtr.Zero, "Button", "取消(&C)");  
                    if (h2 != IntPtr.Zero)
                    {
                        EnableWindow(h2, false);
                        MessageBox.Show(h2.ToString());
                    }
                    else
                    {
                        MessageBox.Show("h2==0");
                    }
                }
                else
                {
                    MessageBox.Show("h1==0");
                }
            }
            catch (Exception err)
            {
                MessageBox.Show("启动更新程序出错\n\r" + err.ToString(), "RavUp提示");
            }
        }输出结果是“h2==0”
为什么获取不到H2的句柄，请个为高手帮帮忙。
补充：setup.exe是瑞星2008安装程序

Answer 1

先这样试试h2 = FindWindowEx(h1, 0, null, "取消(&C)"); 
如果不行，只能使用EnumWindows

Answer 2

FindWindowEx(h1, IntPtr.Zero, "Button", "取消(&C)");  这个地方，尝试一下其它组合条件。用Spy++查看一下Caption,Style是否是你所填的这两个。