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我已经对软件进行了编码，它工作正常，并且 RFID 设备在登录框中也能正常工作，一旦人们使用 RFID 设备密钥登录，它就会进入主页但是 RFID 连接仍然打开并且不会关闭，当有人将其他密钥放在 RFID 设备附近时, 又打开一个窗口并使用其他登录 ID 自动登录，如何阻止它？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlServerCe;
//using System.Diagnostics;
//using System.IO.Ports;
using System.Speech.Synthesis;
using Phidgets;
using Phidgets.Events;

namespace GYM_Management
{
  public partial class Login : GYM_Management.Form1
  {

    RFID   rfid1;
    string lastRFIDTag;
    Int32  TagCtr;

    public Login()
    {
        InitializeComponent();
        lastRFIDTag = "";
        TagCtr = 0;
    }
    connection cc = new connection();
    SpeechSynthesizer sp = new SpeechSynthesizer();


    private void Login_Load(object sender, EventArgs e)
    {
        textBox4.Enabled = true;
        rfid1 = new RFID();
        rfid1.Attach += new AttachEventHandler(rfid_Attach);
        rfid1.Detach += new DetachEventHandler(rfid_Detach);
        rfid1.RFIDTag += new TagEventHandler(rfid_Tag);
        rfid1.RFIDTagLost += new TagEventHandler(rfid_TagLost);
        rfid1.open();

        Text = cc.Title() + " ( Login )";
        groupBox1.Visible = false;
        groupBox2.Visible = true;
    }

    public void RFIDLogin()
    {

        if (textBox4.Text.Length == 10)
        {
            SqlCeConnection con = new SqlCeConnection(cc.connectDB());
            con.Open();
            SqlCeCommand cmd = new SqlCeCommand("delete from log", con);
            cmd.ExecuteNonQuery();
            SqlCeCommand cmd1 = new SqlCeCommand("select * from Login where RFID='" + textBox4.Text + "'", con);
            cmd1.ExecuteNonQuery();
            SqlCeDataReader c = cmd1.ExecuteReader();
            if (c.Read() == true)
            {
                SqlCeCommand cmd2 = new SqlCeCommand("select typeid from Login where RFID='" + textBox4.Text + "'", con);
                Int32 count = (Int32)cmd2.ExecuteScalar();
                if (count == 1)
                {
                    SqlCeCommand cmd3 = new SqlCeCommand("insert into log values ('" + 1 + "')", con);
                    cmd3.ExecuteNonQuery();
                    cmd3.ExecuteNonQuery();
                    Menu shw = new Menu();
                    shw.Show();
                    textBox4.Enabled = false;
                    txtTag.Enabled = false;
                    this.Hide();
                    sp.SpeakAsync("Welcome To Canvey Island GYM");

                }
                else
                    if (count == 2)
                    {
                        SqlCeCommand cmd3 = new SqlCeCommand("insert into log values ('" + 2 + "')", con);
                        cmd3.ExecuteNonQuery();
                        Menu shw = new Menu();
                        shw.Show();
                        textBox4.Enabled = false;
                        txtTag.Enabled = false;
                        this.Hide();
                        sp.SpeakAsync("Welcome To Canvey Island GYM");
                    }

            }
            else
            {
                //MessageBox.Show("Login Failed");
                sp.SpeakAsync("Login Failed");
            }

        }
    }

    public void ent()
    {
        try
        {
            SqlCeConnection con = new SqlCeConnection(cc.connectDB());
            con.Open();
            SqlCeCommand cmd = new SqlCeCommand("delete from log", con);
            cmd.ExecuteNonQuery();
            SqlCeCommand cmd1 = new SqlCeCommand("select * from Login where username='" + textBox1.Text + "' and password='" + textBox2.Text + "'", con);
            cmd1.ExecuteNonQuery();
            SqlCeDataReader c = cmd1.ExecuteReader();
            if (c.Read() == true)
            {
                SqlCeCommand cmd2 = new SqlCeCommand("select typeid from Login where username='" + textBox1.Text + "' and password='" + textBox2.Text + "'", con);
                Int32 count = (Int32)cmd2.ExecuteScalar();
                if (count == 1)
                {
                    SqlCeCommand cmd3 = new SqlCeCommand("insert into log values ('" + 1 + "')", con);
                    cmd3.ExecuteNonQuery();
                }
                else
                    if (count == 2)
                    {
                        SqlCeCommand cmd3 = new SqlCeCommand("insert into log values ('" + 2 + "')", con);
                        cmd3.ExecuteNonQuery();
                    }
                sp.SpeakAsync("Welcome To Canvey Island GYM");
                Menu shw = new Menu();
                shw.Show();
                textBox4.Enabled = false;
                this.Hide();

            }
            else
            {
                sp.SpeakAsync("Login Failed");
            }
        }
        catch (Exception ee)
        {
            MessageBox.Show(ee.Message);
        }
    }
    private void button1_Click(object sender, EventArgs e)
    {
        ent();
    }

    //private void textBox2_KeyDown(object sender, KeyEventArgs e)
    //{
    //    if (e.KeyCode == Keys.Enter)
    //    {
    //        ent();
    //    }
    //}

    private void button2_Click(object sender, EventArgs e)
    {
        groupBox1.Visible = false;
        groupBox2.Visible = true;   
    }

    private void button3_Click(object sender, EventArgs e)
    {
        groupBox2.Visible = false;
        groupBox1.Visible = true;
    }

    private void textBox4_TextChanged(object sender, EventArgs e)
    {
        RFIDLogin();
        rfid1.close();
    }


    void rfid_Tag(object sender, TagEventArgs e)
    {
        textBox4.Text = e.Tag;
        txtTag.Text = e.Tag;
        lastRFIDTag = txtTag.Text;
        rfid1.LED = true;       // light on
    }

    void rfid_TagLost(object sender, TagEventArgs e)
    {
        txtTag.Text = "";
        rfid1.LED = false;      // light off
        //write held Tag ID to listview
        lbPrevRFIDTags.Items.Insert(0,
            string.Format("Tag: {0} - {1}", ++TagCtr, lastRFIDTag));
    }

    void rfid_Detach(object sender, DetachEventArgs e)
    {
        lblAttached.Text = "Not Attached";
    }

    void rfid_Attach(object sender, AttachEventArgs e)
    {
        Phidgets.RFID phid = (Phidgets.RFID)sender;
        lblAttached.Text = "Attached: " + phid.Name;
        lblSerial.Text = " Serial: " + phid.SerialNumber;
        lblVersion.Text = " Version: " + phid.Version;
    }

    private void cboxAntenna_CheckedChanged(object sender, EventArgs e)
    {
        rfid1.Antenna = cboxAntenna.Checked;
    }

  }
  }
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1 回答 1

0

我不熟悉这个 RFID 设备，当阅读器单选时，我的设备会继续在 tagEventHandler 中一遍又一遍地拾取相同的标签。我所做的只是创建一个

bool scantag = true;

然后在您希望它拾取标签时用它控制您的 RFID 方法

void rfid_Tag(object sender, TagEventArgs e)
{

if(scantag == true)
{        

scantag = false;
textBox4.Text = e.Tag;
txtTag.Text = e.Tag;
lastRFIDTag = txtTag.Text;
rfid1.LED = true;       // light on


}

//wait for user to remove tag
System.Threading.Thread.Sleep(5000);

// enable the handler again
scantag = true;

}
于 2013-04-22T21:20:53.143 回答