C#结合数据库实现验证识别ID卡内容的方法

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Data.OleDb;using System.Runtime.InteropServices;using System.Diagnostics;using System.Collections;namespace IDCard{  public partial class Form1 : Form  {    public Form1()    {      InitializeComponent();    }    public delegate int HookProc(int nCode, int wParam, IntPtr lParam);    static int hHook = 0;    public const int WH_KEYBOARD_LL = 13;    //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。     HookProc KeyBoardHookProcedure;    [DllImport("kernel32")]    public static extern int Beep(int dwFreq, int dwDuration);//让计算机蜂鸣    string DataPath = "";//数据库路径    OleDbConnection con;//OleDbConnection对象，连接数据库    OleDbCommand cmd;//OleDbCommand对象，执行SQL语句    //键盘Hook结构函数     [StructLayout(LayoutKind.Sequential)]    public class KeyBoardHookStruct    {      public int vkCode;      public int scanCode;      public int flags;      public int time;      public int dwExtraInfo;    }    [DllImport("user32.dll")]    public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);    [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]    //抽掉钩子     public static extern bool UnhookWindowsHookEx(int idHook);    [DllImport("user32.dll")]    //调用下一个钩子     public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);    [DllImport("kernel32.dll")]    public static extern IntPtr GetModuleHandle(string name);    public string getNum(string code)    {      string flag = "";      switch (code)      {        case "048":          flag="0"; break;        case "049":          flag = "1"; break;        case "050":          flag = "2"; break;        case "051":          flag = "3"; break;        case "052":          flag = "4"; break;        case "053":          flag = "5"; break;        case "054":          flag = "6"; break;        case "055":          flag = "7"; break;        case "056":          flag = "8"; break;        case "057":          flag = "9"; break;      }      return flag;    }    public void Hook_Start()    {      // 安装键盘钩子       if (hHook == 0)      {        KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);        hHook = SetWindowsHookEx(WH_KEYBOARD_LL,             KeyBoardHookProcedure,            GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);        //如果设置钩子失败.         if (hHook == 0)        {          Hook_Clear();         }      }    }    //取消钩子事件     public void Hook_Clear()    {      bool retKeyboard = true;      if (hHook != 0)      {        retKeyboard = UnhookWindowsHookEx(hHook);        hHook = 0;      }      //如果去掉钩子失败.       if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");    }    //这里可以添加自己想要的信息处理     string NumCode="";    public int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)    {      if (nCode >= 0)      {        if (wParam == 0x0104 || wParam == 0x0100)        {          KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));          int flag = kbh.vkCode;          switch (flag)          {            case 96:              NumCode += "0"; break;            case 97:              NumCode += "1"; break;            case 98:              NumCode += "2"; break;            case 99:              NumCode += "3"; break;            case 100:              NumCode += "4"; break;            case 101:              NumCode += "5"; break;            case 102:              NumCode += "6"; break;            case 103:              NumCode += "7"; break;            case 104:              NumCode += "8"; break;            case 105:              NumCode += "9"; break;          }          if (flag == 13)          {            if (NumCode.Length != 0)            {              string c = "";              string id = "";              for (int i = 0; i <= NumCode.Length - 3; i += 3)              {                string b = NumCode.Substring(i, 3);                c += getNum(b);              }              id = c;              if (id.Length == 8)//如果卡号为8位              {                //实例化OleDbConnection对象                con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" + DataPath);                con.Open();//打开数据库连接                //实例化OleDbCommand对象，根据ID卡号检索数据表                cmd = new OleDbCommand("select * from tb_UserInfo where CardID='" + id + "'", con);                OleDbDataReader sdr = cmd.ExecuteReader();//实例化OleDbDataReader对象                sdr.Read();//读取记录                txtShowCardID.Text = id;//获取ID卡号                txtShowName.Text = sdr["UName"].ToString();//获取员工姓名                cbbShowSex.Text = sdr["USex"].ToString();//获取员工性别                cbbShowDep.Text = sdr["UDep"].ToString();//获取员工部门                con.Close();//关闭数据库连接                Beep(3000, 100);//计算机蜂鸣              }              NumCode = "";            }          }        }      }      return CallNextHookEx(hHook, nCode, wParam, lParam);    }     private void Form1_Load(object sender, EventArgs e)    {      cbbdep.SelectedIndex = 0;//设置部门下拉框的第一项被选中      cbbsex.SelectedIndex = 0;//设置性别下拉框的第一项被选中      //获取数据库路径      DataPath = Application.StartupPath.ToString();      DataPath = DataPath.Substring(0, DataPath.LastIndexOf("//"));      DataPath = DataPath.Substring(0, DataPath.LastIndexOf("//"));      DataPath += @"/db.mdb";          }    private void radioButton1_CheckedChanged(object sender, EventArgs e)    {      if (radioButton1.Checked)      {        groupBox1.Enabled = true;        Hook_Clear();      }    }    private void radioButton2_CheckedChanged(object sender, EventArgs e)    {      if (radioButton2.Checked)      {        groupBox1.Enabled = false;        Hook_Start();      }    }    private void button2_Click(object sender, EventArgs e)    {      txtIdcard.Text = "";      txtName.Text = "";    }    private void button1_Click(object sender, EventArgs e)    {      if (txtIdcard.Text == "" || txtName.Text == "")//如果没有输入ID卡号和员工姓名      {        //弹出警告信息        if (MessageBox.Show("请将数据填写完整！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error) == DialogResult.OK)        {          if (txtIdcard.Text == "")//如果没有输入ID卡号            txtIdcard.Focus();//则光标处在输入ID卡号的文本框          if (txtName.Text == "")//如果没有输入员工姓名            txtName.Focus();//则光标处在输入员工姓名的文本框          if (txtIdcard.Text == "" && txtName.Text == "")//如果都没输入数据            txtIdcard.Focus();//则光标处在输入ID卡号的文本框        }      }      else//如果输入了数据      {        if (txtIdcard.Text.Trim().Length != 8)//如果输入的ID卡号不是8位        {          //弹出警告信息          if (MessageBox.Show("ID卡号必须为8位！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error) == DialogResult.OK)          {            txtIdcard.Text = "";//清空输入ID卡号的文本框            txtIdcard.Focus();//让光标处在输入ID卡号的文本框上          }        }        else//如果输入的ID卡号为8位        {          //实例化OleDbConnection对象          con=new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" + DataPath);          con.Open();//打开连接          //实例化OleDbCommand对象          cmd = new OleDbCommand("select count(*) from tb_UserInfo where CardID='"+txtIdcard.Text.Trim()+"'", con);          int flag =Convert.ToInt32(cmd.ExecuteScalar());//判断是否已经添加过此ID卡号          if (flag > 0)//如果大于0则说明已经添加过          {            //弹出警告信息            if (MessageBox.Show("ID卡号已经添加过了！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error) == DialogResult.OK)            {              button2_Click(sender, e);//清空输入ID卡号和员工姓名的文本框            }          }          else//如果小于0说明没有添加过          {            //实例化OleDbCommand对象            cmd = new OleDbCommand("insert into tb_UserInfo(CardID,UName,USex,UDep) values ('" + txtIdcard.Text.Trim() + "','" + txtName.Text.Trim() + "','" + cbbsex.Text.Trim() + "','" + cbbdep.Text.Trim() + "')", con);            int k = cmd.ExecuteNonQuery();//执行insert语句，将输入的信息添加到数据库中            if (k > 0)//如果大于0则操作成功            {              //弹出提示信息              if (MessageBox.Show("添加成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information) == DialogResult.OK)              {                button2_Click(sender, e);//清空输入ID卡号和员工姓名的文本框              }            }          }          con.Close();//关闭数据库连接        }      }    }    private void txtIdcard_KeyPress(object sender, KeyPressEventArgs e)    {      if (!(e.KeyChar <= '9' && e.KeyChar >= '0') && e.KeyChar != '/r' && e.KeyChar != '/b')      {        e.Handled = true;      }    }  }}