作者：陈广 日期：2019-2-23
Mifare S50 卡中的数据块可用于存放数据及值，两者的格式不同，本实验讲解值块的读写操作。我们知道，一个值块的16个字节只能存放一个 32 位有符号整数，即占用 4 个字节。其中备份地址用去 4 个字节，一个值，存储三次，共用 12 个字节。本实验通过一个公交刷卡程序讲解初始化值、加值、减值、读值等操作。
随着学习的深入，我们开始尝试使用 UI 写程序，本实验试图模拟一个地铁刷卡程序，实现的功能有卡的初始化、充值、刷卡扣钱。刷卡扣钱需要使用被动 选卡功能（之前的《选卡操作》实验讲过），需开一个可终止线程由上位机不断进行选卡操作。这一次使用 WPF 来实现此程序，WPF 的最大好处是界面创建不再需要语言描述，直接上代码就 OK 了。将来我准备用 WPF 重写《C#程序设计基础教程与实训》，毕竟 WPF 使用起来更接近网页 UI（虽然差别还是很大）。
新建一个 WPF 应用程序，界面代码如下：
<Window x:Class="ValueOper.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ValueOper"
mc:Ignorable="d"
Title="值块操作" Height="300" Width="500" Loaded="Window_Loaded">
<Grid Background="#DDD">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="150"/>
<ColumnDefinition Width="159*"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.Column="0" Margin="0,0,0.4,-0.4">
<Button x:Name="BtnInit" Content="钱包功能初始化" Padding="5" Margin="10,25,10,5" Click="Btn_InitValue_Click"/>
<Button x:Name="BtnAdd" Content="充值" Padding="5" Margin="10,5,10,5" Click="Btn_Increment_Click"/>
<Grid Margin="10,5,10,5">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="充值钱数：" VerticalAlignment="Center"/>
<TextBox x:Name="txtAddCoin" Grid.Column="1" Text="20" Padding="5"/>
</Grid>
<Button x:Name="Btn_Work" Content="进入工作状态" Padding="5" Margin="10,5,10,5" Click="Btn_Work_Click"/>
</StackPanel>
<ScrollViewer Grid.Column="1" VerticalScrollBarVisibility="Auto">
<TextBox x:Name="txtMsg" TextWrapping="Wrap"/>
</ScrollViewer>
</Grid>
</Window>
程序代码如下：
using HBLib;
using HBLib.HR8002Reader;
using HBLib.ISO14443A;
using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
namespace ValueOper
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
const byte OPER_BLOCKNUM = 1;
ComPort com = new ComPort("COM3", 19200, 300);
Reader reader;
I14443A i14443a;
byte[] operUID; //上一轮操作被扣钱的标签ID
CancellationTokenSource ts;
SolidColorBrush grayBrush = new SolidColorBrush(Color.FromArgb(0xFF, 0x55, 0x55, 0x55));
SolidColorBrush greenBrush = new SolidColorBrush(Color.FromArgb(0xFF, 0xA0, 0xBB, 0x55));
private void Window_Loaded(object sender, RoutedEventArgs e)
{
com.Open();
reader = new Reader(0x00, com);
i14443a = new I14443A(0x00, com);
reader.ChangeToISO14443AAsync();
}
private void Btn_InitValue_Click(object sender, RoutedEventArgs e)
{
InitValue(50, OPER_BLOCKNUM); //充值 50 块钱
}
//开线程等待刷卡扣钱
private void Btn_Work_Click(object sender, RoutedEventArgs e)
{
if (Convert.ToString(Btn_Work.Content) == "进入工作状态") //开线程
{
ts = new CancellationTokenSource();
Task.Factory.StartNew(() => Work(6, OPER_BLOCKNUM), ts.Token,
TaskCreationOptions.LongRunning, TaskScheduler.Default);
Btn_Work.Background = greenBrush;
Btn_Work.Content = "退出工作状态";
BtnInit.IsEnabled = false;
BtnAdd.IsEnabled = false;
}
else //取消线程
{
ts.Cancel();
Btn_Work.Background = grayBrush;
Btn_Work.Content = "进入工作状态";
BtnInit.IsEnabled = true;
BtnAdd.IsEnabled = true;
}
}
private void Btn_Increment_Click(object sender, RoutedEventArgs e)
{
Increment(int.Parse(txtAddCoin.Text), OPER_BLOCKNUM);
}
/// <summary>
/// 充值
/// </summary>
/// <param name="coin">充入的钱数，块为单位</param>
/// <param name="blockNum">操作的绝对块号</param>
/// <returns></returns>
private async Task Increment(int coin, byte blockNum)
{
// 选卡操作
byte[] uid = await Select();
if (uid == null)
{
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.Text = "没有选中任何卡片！";
}));
return;
}
//证实
if (!await AuthKey((byte)(blockNum / 4)))
{
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.Text = "证实失败！";
}));
return;
}
byte[] data = BitConverter.GetBytes(coin * 100);
var info = await i14443a.IncrementAsync(blockNum, data);
if (info.ReturnValue == ReturnMessage.Success)
{
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.Text = "充值成功，已充入 " + coin.ToString() + "元钱。";
}));
//读取剩余钱数
var info1 = await i14443a.ReadValueAsync(blockNum);
if (info1.ReturnValue == ReturnMessage.Success)
{
int remain = BitConverter.ToInt32(info1.ValueData, 0);
string money = Convert.ToString(remain / 100);
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.AppendText("卡内剩余：" + money + " 块钱。");
}));
}
}
}
/// <summary>
/// 让程序处于工作状态，等待刷卡并扣钱
/// </summary>
/// <param name="coin">每次刷卡扣的钱数</param>
/// <returns></returns>
private async Task Work(int coin, byte blockNum)
{
byte[] data = BitConverter.GetBytes(coin * 100);
while (!ts.IsCancellationRequested)
{
// 选卡
byte[] uid = await Select();
if (uid != null)
{
if (CompareUID(uid, operUID)) //如果此卡之前已经扣过钱且未离开感应区，则不操作
{
continue;
}
}
else
{
operUID = null; //说明卡片已经离开感应区
continue;
}
//证实
if (!await AuthKey((byte)(blockNum / 4))) continue;
//读取剩余钱数，判断卡内剩余的钱是否够扣
var info1 = await i14443a.ReadValueAsync(blockNum);
if (info1.ReturnValue == ReturnMessage.Success)
{
int remain = BitConverter.ToInt32(info1.ValueData, 0);
if (remain < coin * 100)
{
string money = Convert.ToString(remain / 100);
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.AppendText("\r\n卡内余额不足，现剩余：" + money + " 块钱。");
}));
operUID = uid;
continue;
}
}
var info = await i14443a.ValueAsync(OperCode.Decrease, blockNum, data, blockNum); //扣钱
if (info.ReturnValue != ReturnMessage.Success) continue;
operUID = uid; //记录被扣钱的标签UID，以防下次重复扣钱
await reader.BeepAsync(5, 0, 1); //蜂鸣器响一声
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.AppendText("\r\n成功刷卡，扣除" + coin.ToString() + "块钱。");
}));
//读取剩余钱数
info1 = await i14443a.ReadValueAsync(blockNum);
if (info1.ReturnValue == ReturnMessage.Success)
{
int remain = BitConverter.ToInt32(info1.ValueData, 0);
string money = Convert.ToString(remain / 100);
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.AppendText("\r\n卡内剩余：" + money + " 块钱。");
}));
}
Thread.Sleep(300);
}
}
/// <summary>
/// 钱包初始化
/// </summary>
/// <param name="coin">第一次充入的钱，以元为单位</param>
/// <param name="blockNum">用于初始化的绝对块号</param>
/// <returns></returns>
private async Task InitValue(int coin, byte blockNum)
{
// 选卡操作
byte[] uid = await Select();
if (uid == null)
{
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.Text = "没有选中任何卡片！";
}));
return;
}
//证实
if (!await AuthKey((byte)(blockNum / 4)))
{
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.Text = "证实失败！";
}));
return;
}
//初始化钱包
byte[] data = BitConverter.GetBytes(coin * 100);
var info = await i14443a.InitValueAsync(blockNum, data);
if (info.ReturnValue == ReturnMessage.Success)
{
this.Dispatcher.Invoke(new Action(() =>
{
txtMsg.Text = "钱包初始化完毕，已充入 " + coin.ToString() + "元钱。";
}));
}
}
/// <summary>
/// 选卡操作
/// </summary>
/// <returns>返回被选中的标签的 UID，如果未选中标签，则返回 null</returns>
private async Task<byte[]> Select()
{
//请求操作
var info = await i14443a.RequestAsync(RequestMode.AllCard);
if (info.ReturnValue != ReturnMessage.Success)
{
return null;
}
//防冲突操作，感应区内只允许放置一张卡片
var info1 = await i14443a.Anticoll2Async(MultiLable.AllowOne);
if (info1.ReturnValue != ReturnMessage.Success)
{
return null;
}
//选卡操作
var info2 = await i14443a.SelectAsync(info1.UID);
if (info2.ReturnValue != ReturnMessage.Success)
{
return null;
}
return info1.UID;
}
/// <summary>
/// 证实指定扇区
/// </summary>
/// <param name="sectorNum">要证实的扇区</param>
/// <returns>证实成功则返回 true,否则返回 fasle。</returns>
private async Task<bool> AuthKey(byte sectorNum)
{
byte[] keyA = new byte[] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
//密码 A 证实
var info3 = await i14443a.AuthKeyAsync(KeyType.KeyA, sectorNum, keyA);
if (info3.ReturnValue != ReturnMessage.Success)
{
Console.WriteLine(info3.GetStatusStr());
return false;
}
return true;
}
private bool CompareUID(byte[] uid1, byte[] uid2)
{
if (uid1 == null || uid2 == null) return false;
if (uid1.Length != uid2.Length) return false;
for (int i = 0; i < uid1.Length; i++)
{
if (uid1[i] != uid2[i])
{
return false;
}
}
return true;
}
}
}
功能不多，但代码不少。没办法写程序就是这样，要相对完善，就得代码多，虽然这里还是有不少需要完善的地方。运行程序，拿一张标签放入感应场（此程序只能在感应场内放一张标签，放多张无效）。
先单击【钱包功能初始化】按钮进行初始化，然后将标签拿走，单击【进入工作状态】，将标签不断放入并离开感应场进行刷卡，查看实验结果。钱用完后可以单击【退出工作状态】后，再单击【充值】按钮进行充值。
;