0x01 关于思路
代码是用C#写的，核心思路是末尾两端的数据是存储水卡的数据 首4位是存储水卡数据，倒数四位是校验码计算后的结果 偏移量82.然后首位4位中12和34位置的数据位置互换。
0x02 结语
喜欢一句话：技术不分对错.人性才分善恶. 这个仅供学习测试，勿用于实际。否则后果自负！！
0x03 核心代码
代码语言：javascript复制using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WaterCard
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
WindowStartupLocation = WindowStartupLocation.CenterScreen;
}
int MaxMoney = 1000000;//100000为1k
int MinMoney = 100;//必须以100为倍数
/// <summary>
/// 字符串转16进制
/// </summary>
/// <param name="num">字符串</param>
/// <returns></returns>
private string IntToHex(int num)
{
string result = num.ToString("X"); //转16进制
return result;
}
/// <summary>
/// 16进制转10进制
/// </summary>
/// <param name="num">16进制</param>
/// <returns></returns>
private int HexToInt(string num)
{
int result = 0;
result = int.Parse(num, System.Globalization.NumberStyles.AllowHexSpecifier);//16转10
return result;
}
/// <summary>
/// 从右开始读取除F以外的字符
/// </summary>
/// <param name="num"></param>
/// <returns></returns>
private string RightReadString(string num)
{
string result="",tmp="";
for (int i = num.Length - 1; i >= 0; i--)
{
if(num.Substring(i, 1)!="F")
tmp = num.Substring(i, 1);
}
for (int i = tmp.Length - 1; i >= 0; i--)
{
if (tmp.Substring(i, 1) != "F")
result = tmp.Substring(i, 1);
}
return result;
}
private void txtMoney_KeyDown(object sender, KeyEventArgs e)
{
bool shiftKey = (Keyboard.Modifiers & ModifierKeys.Shift) != 0;//判断shifu键是否按下
if (shiftKey == true) //当按下shift
{
e.Handled = true;//不可输入
}
else //未按shift
{
if (!((e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Delete || e.Key == Key.Back || e.Key == Key.Tab || e.Key == Key.Enter || e.Key==Key.Decimal))
{
e.Handled = true;//不可输入
}
else if(e.Key == Key.Enter )
{
string Money = txtMoney.Text.ToString().Trim().Replace(".", "");
if (int.Parse(Money) > MaxMoney)//大于
{
txtMoney.Text = (MinMoney / 100).ToString() ".00";
Money = MinMoney.ToString();
Money = txtMoney.Text.ToString().Trim().Replace(".", "");
}
string Money_body_Value = "110B1709320808";//总共32个字符 这个最长14位
string Money_head_Value = "";//最长12位
string Money_bottom_Value = "";//最长6位
string Money_Value = "";
if (Money != "")
{
string Money16_Sub1 = "";
string Money16_Sub2 = "";
string Zero = "0";
int Money10 = int.Parse(Money);
string Money16 = IntToHex(Money10);
int Money16_Len = Money16.Length.GetHashCode();
int Money_bottom_Value_SloveData = 0;
//
if (Money16_Len%2==0)
{
for (int i = 0; i < Money16_Len - 2; i = 2)
{
Money16_Sub2 = Money16.Substring(i, 2) Money16_Sub2;
Money_bottom_Value_SloveData = Money_bottom_Value_SloveData HexToInt(Money16.Substring(i, 2));
}
Money16_Sub1 = Money16.Substring(Money16_Len-2, 2);
Money_bottom_Value_SloveData = Money_bottom_Value_SloveData HexToInt(Money16_Sub1);
}
else
{
Money16 = "0" Money16;
Money16_Len = Money16.Length.GetHashCode();
for (int i = 0; i <Money16_Len-2; i =2)
{
Money16_Sub2 = Money16.Substring(i, 2) Money16_Sub2;
Money_bottom_Value_SloveData = Money_bottom_Value_SloveData HexToInt(Money16.Substring(i, 2));
}
Money16_Sub1 = Money16.Substring(Money16_Len-2, 2);
Money_bottom_Value_SloveData = Money_bottom_Value_SloveData HexToInt(Money16_Sub1);
}
Money_bottom_Value_SloveData -= 130;//校验码计算
string Money_bottom_Value_SloveData_Int16 = IntToHex(Money_bottom_Value_SloveData);//校验码计算 130是10进制 82 16进制
Money_bottom_Value = RightReadString(Money_bottom_Value_SloveData_Int16);
Money_head_Value = Money16_Sub1 Money16_Sub2;
int Money_bottom_Value_Len = Money_bottom_Value.Length.GetHashCode();
int Money_head_Value_Len = Money_head_Value.Length.GetHashCode();
if (Money_bottom_Value_Len<6)
{
for(int i=0;i<6- Money_bottom_Value_Len;i )
{
Money_bottom_Value = Zero Money_bottom_Value;
}
}
if (Money_head_Value_Len<12)
{
for (int i = 0; i < 12 - Money_head_Value_Len; i )
{
Money_head_Value =Zero;
}
}
Money_Value = Money_head_Value Money_body_Value Money_bottom_Value;
txtMoney_Value.Text = Money_Value;
}
}
}
}
private void form1_Loaded(object sender, RoutedEventArgs e)
{
textBlock_info.Text = "最大上限值为：" (MaxMoney/100.0).ToString() "元" "超过这个值的大小则生成的为" (MinMoney / 100.0).ToString() "元的值";
}
}
}
