C#实现员工ID卡的识别功能

实践过程

效果

代码

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;
       }
   }
}

partial class Form1
{
   /// <summary>
   /// 必需的设计器变量。
   /// </summary>
   private System.ComponentModel.IContainer components = null;

/// <summary>
   /// 清理所有正在使用的资源。
   /// </summary>
   /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
   protected override void Dispose(bool disposing)
   {
       if (disposing && (components != null))
       {
           components.Dispose();
       }
       base.Dispose(disposing);
   }

#region Windows 窗体设计器生成的代码

/// <summary>
   /// 设计器支持所需的方法 - 不要
   /// 使用代码编辑器修改此方法的内容。
   /// </summary>
   private void InitializeComponent()
   {
       this.groupBox1 = new System.Windows.Forms.GroupBox();
       this.txtIdcard = new System.Windows.Forms.TextBox();
       this.button2 = new System.Windows.Forms.Button();
       this.button1 = new System.Windows.Forms.Button();
       this.cbbdep = new System.Windows.Forms.ComboBox();
       this.label4 = new System.Windows.Forms.Label();
       this.cbbsex = new System.Windows.Forms.ComboBox();
       this.label3 = new System.Windows.Forms.Label();
       this.txtName = new System.Windows.Forms.TextBox();
       this.label2 = new System.Windows.Forms.Label();
       this.label1 = new System.Windows.Forms.Label();
       this.radioButton1 = new System.Windows.Forms.RadioButton();
       this.radioButton2 = new System.Windows.Forms.RadioButton();
       this.groupBox2 = new System.Windows.Forms.GroupBox();
       this.cbbShowDep = new System.Windows.Forms.ComboBox();
       this.label5 = new System.Windows.Forms.Label();
       this.cbbShowSex = new System.Windows.Forms.ComboBox();
       this.label6 = new System.Windows.Forms.Label();
       this.txtShowName = new System.Windows.Forms.TextBox();
       this.label7 = new System.Windows.Forms.Label();
       this.txtShowCardID = new System.Windows.Forms.TextBox();
       this.label8 = new System.Windows.Forms.Label();
       this.groupBox1.SuspendLayout();
       this.groupBox2.SuspendLayout();
       this.SuspendLayout();
       //
       // groupBox1
       //
       this.groupBox1.Controls.Add(this.txtIdcard);
       this.groupBox1.Controls.Add(this.button2);
       this.groupBox1.Controls.Add(this.button1);
       this.groupBox1.Controls.Add(this.cbbdep);
       this.groupBox1.Controls.Add(this.label4);
       this.groupBox1.Controls.Add(this.cbbsex);
       this.groupBox1.Controls.Add(this.label3);
       this.groupBox1.Controls.Add(this.txtName);
       this.groupBox1.Controls.Add(this.label2);
       this.groupBox1.Controls.Add(this.label1);
       this.groupBox1.Location = new System.Drawing.Point(10, 31);
       this.groupBox1.Name = "groupBox1";
       this.groupBox1.Size = new System.Drawing.Size(435, 120);
       this.groupBox1.TabIndex = 0;
       this.groupBox1.TabStop = false;
       this.groupBox1.Text = "输入员工信息";
       //
       // txtIdcard
       //
       this.txtIdcard.Location = new System.Drawing.Point(69, 21);
       this.txtIdcard.Name = "txtIdcard";
       this.txtIdcard.Size = new System.Drawing.Size(137, 21);
       this.txtIdcard.TabIndex = 4;
       this.txtIdcard.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtIdcard_KeyPress);
       //
       // button2
       //
       this.button2.Location = new System.Drawing.Point(214, 91);
       this.button2.Name = "button2";
       this.button2.Size = new System.Drawing.Size(75, 23);
       this.button2.TabIndex = 9;
       this.button2.Text = "重置";
       this.button2.UseVisualStyleBackColor = true;
       this.button2.Click += new System.EventHandler(this.button2_Click);
       //
       // button1
       //
       this.button1.Location = new System.Drawing.Point(131, 91);
       this.button1.Name = "button1";
       this.button1.Size = new System.Drawing.Size(75, 23);
       this.button1.TabIndex = 8;
       this.button1.Text = "添加";
       this.button1.UseVisualStyleBackColor = true;
       this.button1.Click += new System.EventHandler(this.button1_Click);
       //
       // cbbdep
       //
       this.cbbdep.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
       this.cbbdep.FormattingEnabled = true;
       this.cbbdep.Items.AddRange(new object[] {
       "C#部门",
       "ASP.NET部门",
       "基础部",
       "VB部门",
       "VC部门",
       "JAVA部门"});
       this.cbbdep.Location = new System.Drawing.Point(279, 57);
       this.cbbdep.Name = "cbbdep";
       this.cbbdep.Size = new System.Drawing.Size(137, 20);
       this.cbbdep.TabIndex = 7;
       //
       // label4
       //
       this.label4.AutoSize = true;
       this.label4.Location = new System.Drawing.Point(212, 60);
       this.label4.Name = "label4";
       this.label4.Size = new System.Drawing.Size(65, 12);
       this.label4.TabIndex = 6;
       this.label4.Text = "所属部门：";
       //
       // cbbsex
       //
       this.cbbsex.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
       this.cbbsex.FormattingEnabled = true;
       this.cbbsex.Items.AddRange(new object[] {
       "男职工",
       "女职工"});
       this.cbbsex.Location = new System.Drawing.Point(69, 57);
       this.cbbsex.Name = "cbbsex";
       this.cbbsex.Size = new System.Drawing.Size(137, 20);
       this.cbbsex.TabIndex = 5;
       //
       // label3
       //
       this.label3.AutoSize = true;
       this.label3.Location = new System.Drawing.Point(6, 61);
       this.label3.Name = "label3";
       this.label3.Size = new System.Drawing.Size(65, 12);
       this.label3.TabIndex = 4;
       this.label3.Text = "员工性别：";
       //
       // txtName
       //
       this.txtName.Location = new System.Drawing.Point(279, 21);
       this.txtName.Name = "txtName";
       this.txtName.Size = new System.Drawing.Size(137, 21);
       this.txtName.TabIndex = 3;
       //
       // label2
       //
       this.label2.AutoSize = true;
       this.label2.Location = new System.Drawing.Point(212, 26);
       this.label2.Name = "label2";
       this.label2.Size = new System.Drawing.Size(65, 12);
       this.label2.TabIndex = 2;
       this.label2.Text = "员工姓名：";
       //
       // label1
       //
       this.label1.AutoSize = true;
       this.label1.Location = new System.Drawing.Point(6, 26);
       this.label1.Name = "label1";
       this.label1.Size = new System.Drawing.Size(65, 12);
       this.label1.TabIndex = 0;
       this.label1.Text = "ID卡编号：";
       //
       // radioButton1
       //
       this.radioButton1.AutoSize = true;
       this.radioButton1.Checked = true;
       this.radioButton1.Location = new System.Drawing.Point(10, 8);
       this.radioButton1.Name = "radioButton1";
       this.radioButton1.Size = new System.Drawing.Size(95, 16);
       this.radioButton1.TabIndex = 1;
       this.radioButton1.TabStop = true;
       this.radioButton1.Text = "添加员工信息";
       this.radioButton1.UseVisualStyleBackColor = true;
       this.radioButton1.CheckedChanged += new System.EventHandler(this.radioButton1_CheckedChanged);
       //
       // radioButton2
       //
       this.radioButton2.AutoSize = true;
       this.radioButton2.Location = new System.Drawing.Point(10, 157);
       this.radioButton2.Name = "radioButton2";
       this.radioButton2.Size = new System.Drawing.Size(95, 16);
       this.radioButton2.TabIndex = 2;
       this.radioButton2.Text = "获取员工信息";
       this.radioButton2.UseVisualStyleBackColor = true;
       this.radioButton2.CheckedChanged += new System.EventHandler(this.radioButton2_CheckedChanged);
       //
       // groupBox2
       //
       this.groupBox2.Controls.Add(this.cbbShowDep);
       this.groupBox2.Controls.Add(this.label5);
       this.groupBox2.Controls.Add(this.cbbShowSex);
       this.groupBox2.Controls.Add(this.label6);
       this.groupBox2.Controls.Add(this.txtShowName);
       this.groupBox2.Controls.Add(this.label7);
       this.groupBox2.Controls.Add(this.txtShowCardID);
       this.groupBox2.Controls.Add(this.label8);
       this.groupBox2.Enabled = false;
       this.groupBox2.Location = new System.Drawing.Point(10, 179);
       this.groupBox2.Name = "groupBox2";
       this.groupBox2.Size = new System.Drawing.Size(435, 93);
       this.groupBox2.TabIndex = 3;
       this.groupBox2.TabStop = false;
       this.groupBox2.Text = "员工信息";
       //
       // cbbShowDep
       //
       this.cbbShowDep.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
       this.cbbShowDep.FormattingEnabled = true;
       this.cbbShowDep.Items.AddRange(new object[] {
       "C#部门",
       "ASP.NET部门",
       "基础部",
       "VB部门",
       "VC部门",
       "JAVA部门"});
       this.cbbShowDep.Location = new System.Drawing.Point(279, 57);
       this.cbbShowDep.Name = "cbbShowDep";
       this.cbbShowDep.Size = new System.Drawing.Size(137, 20);
       this.cbbShowDep.TabIndex = 7;
       //
       // label5
       //
       this.label5.AutoSize = true;
       this.label5.Location = new System.Drawing.Point(212, 60);
       this.label5.Name = "label5";
       this.label5.Size = new System.Drawing.Size(65, 12);
       this.label5.TabIndex = 6;
       this.label5.Text = "所属部门：";
       //
       // cbbShowSex
       //
       this.cbbShowSex.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
       this.cbbShowSex.FormattingEnabled = true;
       this.cbbShowSex.Items.AddRange(new object[] {
       "男职工",
       "女职工"});
       this.cbbShowSex.Location = new System.Drawing.Point(69, 57);
       this.cbbShowSex.Name = "cbbShowSex";
       this.cbbShowSex.Size = new System.Drawing.Size(137, 20);
       this.cbbShowSex.TabIndex = 5;
       //
       // label6
       //
       this.label6.AutoSize = true;
       this.label6.Location = new System.Drawing.Point(6, 61);
       this.label6.Name = "label6";
       this.label6.Size = new System.Drawing.Size(65, 12);
       this.label6.TabIndex = 4;
       this.label6.Text = "员工性别：";
       //
       // txtShowName
       //
       this.txtShowName.Location = new System.Drawing.Point(279, 21);
       this.txtShowName.Name = "txtShowName";
       this.txtShowName.Size = new System.Drawing.Size(137, 21);
       this.txtShowName.TabIndex = 3;
       //
       // label7
       //
       this.label7.AutoSize = true;
       this.label7.Location = new System.Drawing.Point(212, 26);
       this.label7.Name = "label7";
       this.label7.Size = new System.Drawing.Size(65, 12);
       this.label7.TabIndex = 2;
       this.label7.Text = "员工姓名：";
       //
       // txtShowCardID
       //
       this.txtShowCardID.Location = new System.Drawing.Point(69, 22);
       this.txtShowCardID.Name = "txtShowCardID";
       this.txtShowCardID.Size = new System.Drawing.Size(137, 21);
       this.txtShowCardID.TabIndex = 1;
       //
       // label8
       //
       this.label8.AutoSize = true;
       this.label8.Location = new System.Drawing.Point(6, 26);
       this.label8.Name = "label8";
       this.label8.Size = new System.Drawing.Size(65, 12);
       this.label8.TabIndex = 0;
       this.label8.Text = "ID卡编号：";
       //
       // Form1
       //
       this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
       this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
       this.ClientSize = new System.Drawing.Size(457, 276);
       this.Controls.Add(this.groupBox2);
       this.Controls.Add(this.radioButton2);
       this.Controls.Add(this.radioButton1);
       this.Controls.Add(this.groupBox1);
       this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
       this.MaximizeBox = false;
       this.Name = "Form1";
       this.Text = "使用ID卡识别员工编号";
       this.Load += new System.EventHandler(this.Form1_Load);
       this.groupBox1.ResumeLayout(false);
       this.groupBox1.PerformLayout();
       this.groupBox2.ResumeLayout(false);
       this.groupBox2.PerformLayout();
       this.ResumeLayout(false);
       this.PerformLayout();

}

#endregion

private System.Windows.Forms.GroupBox groupBox1;
   private System.Windows.Forms.Button button2;
   private System.Windows.Forms.Button button1;
   private System.Windows.Forms.ComboBox cbbdep;
   private System.Windows.Forms.Label label4;
   private System.Windows.Forms.ComboBox cbbsex;
   private System.Windows.Forms.Label label3;
   private System.Windows.Forms.TextBox txtName;
   private System.Windows.Forms.Label label2;
   private System.Windows.Forms.Label label1;
   private System.Windows.Forms.RadioButton radioButton1;
   private System.Windows.Forms.RadioButton radioButton2;
   private System.Windows.Forms.GroupBox groupBox2;
   private System.Windows.Forms.ComboBox cbbShowDep;
   private System.Windows.Forms.Label label5;
   private System.Windows.Forms.ComboBox cbbShowSex;
   private System.Windows.Forms.Label label6;
   private System.Windows.Forms.TextBox txtShowName;
   private System.Windows.Forms.Label label7;
   private System.Windows.Forms.TextBox txtShowCardID;
   private System.Windows.Forms.Label label8;
   private System.Windows.Forms.TextBox txtIdcard;
}

来源：https://blog.csdn.net/qq_27489007/article/details/128474359