private void timer1_Tick(object sender, EventArgs e)
        {
            if (bitmap != null && count <= 20)
            {
                try
                {
                    result = null;
                    model t = new model();
                    t.SetTrainedFaceRecognizer(model.FaceRecognizerType.LBPHFaceRecognizer);
                    Image <Bgr, byte> currentFrame = new Image <Bgr, byte>(bitmap);
                    Mat invert = new Mat();
                    CvInvoke.BitwiseAnd(currentFrame, currentFrame, invert);
                    result = t.faceRecognize(invert);
                    if (result.names.Count > 0)
                    {
                        //var tmp = x.logon(null, null, null, result.names[0]);
                        //创建数据库连接类的对象
                        SqlConnection con = new SqlConnection("server=.;database=RD;user=sa;pwd=Sa123456");
                        //将连接打开
                        con.Open();
                        //执行con对象的函数,返回一个SqlCommand类型的对象
                        SqlCommand cmd = con.CreateCommand();
                        //把输入的数据拼接成sql语句,并交给cmd对象
                        cmd.CommandText = "select * from [user] where face ='" + result.names[0] + "'";
                        //用cmd的函数执行语句,返回SqlDataReader对象dr,dr就是返回的结果集(也就是数据库中查询到的表数据)
                        SqlDataReader dr = cmd.ExecuteReader();
                        //用dr的read函数,每执行一次,返回一个包含下一行数据的集合dr,在执行read函数之前,dr并不是集合

                        if (dr.Read())
                        {
                            //dr[]里面可以填列名或者索引,显示获得的数据</span>
                            //MessageBox.Show(dr["Num"].ToString());
                            login_time     = DateTime.Now.ToString("");
                            user           = dr["id"].ToString();
                            timer1.Enabled = false;
                            timer2.Enabled = false;
                            this.videoSourcePlayer1.Stop();
                            this.videoSourcePlayer1.Dispose();
                            this.Close();
                            Thread thread = new Thread(showform);
                            thread.IsBackground = false;
                            thread.Start();
                            //用完后关闭连接,以免影响其他程序访问
                            con.Close();
                        }
                        else
                        {
                            MessageBox.Show("用户名或密码错误!请重新输入!");
                        }
                    }
                    count++;
                }
                catch (Exception ex)
                {
                    timer1.Enabled = false;
                    timer2.Enabled = false;
                    MessageBox.Show("错误提示:" + ex.Message);
                }
            }
            else
            {
                timer1.Enabled = false;
                timer2.Enabled = false;
                this.videoSourcePlayer1.Stop();
                this.videoSourcePlayer1.Dispose();
                this.videoSourcePlayer1.Visible = false;
                this.pictureBox1.Visible        = true;
                errorLogin error = new errorLogin();
                error.ShowDialog(this);
            }
        }