public partial class ReadCard : Form    {        // 操作IC卡的函数，封装在IC类中        [StructLayout(LayoutKind.Sequential)]        public unsafe class IC        {            //对设备进行初始化            [DllImport("Mwic_32.dll", EntryPoint = "auto_init", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]            public static extern int auto_init(int port, int baud);            //设备密码格式            [DllImport("Mwic_32.dll", EntryPoint = "setsc_md", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]            public static extern int setsc_md(int icdev, int mode);            //获取设备当前状态            [DllImport("Mwic_32.dll", EntryPoint = "get_status", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]            public static extern Int16 get_status(int icdev, Int16* state);            //关闭设备通讯接口            [DllImport("Mwic_32.dll", EntryPoint = "ic_exit", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]            public static extern int ic_exit(int icdev);            //使设备发出蜂鸣声            [DllImport("Mwic_32.dll", EntryPoint = "dv_beep", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]            public static extern int dv_beep(int icdev, int time);            //向IC卡中写数据            [DllImport("Mwic_32.dll", EntryPoint = "swr_4442", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]            public static extern int swr_4442(int icdev, int offset, int len, char* w_string);            //核对卡密码              [DllImport("Mwic_32.dll", EntryPoint = "csc_4442", SetLastError = true, CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]            public static extern Int16 Csc_4442(int icdev, int len, [MarshalAs(UnmanagedType.LPArray)] byte[] p_string);        }        public ReadCard()        {            InitializeComponent();        }        // 下面主要是 将TextBox的数据写入到IC卡        private void button1_Click(object sender, EventArgs e)        {            //初始化            int icdev = IC.auto_init(0, 9600);            if (icdev < 0)                MessageBox.Show("端口初始化失败,请检查接口线是否连接正确。", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Information);            int md = IC.setsc_md(icdev, 1); //设备密码格式            unsafe            {                Int16 status = 0;                Int16 result = 0;                result = IC.get_status(icdev, &status);                if (result != 0)                {                    MessageBox.Show("设备当前状态错误！");                    int d1 = IC.ic_exit(icdev);   //关闭设备                    return;                }                if (status != 1)                {                    MessageBox.Show("请插入ＩＣ卡");                    int d2 = IC.ic_exit(icdev);   //关闭设备                    return;                }            }            unsafe            {                //卡的密码默认为6个F（密码为：ffffff），1个F的16进制是15,2个F的16进制是255。                byte[] pwd = new byte[3] { 255, 255, 255 };                //byte[] pwd = new byte[3] { 0xff, 0xff, 0xff };                //char[] pass=new ch{0xff,0xff,0xff};                Int16 checkIC_pwd = IC.Csc_4442(icdev, 3, pwd);                if (checkIC_pwd < 0)                {                    MessageBox.Show("ＩＣ卡密码错误！");                    return;                }                char str = ‘a‘;                int write = -1;                for (int j = 0; j < textBox1.Text.Length; j++)                {                    str = Convert.ToChar(textBox1.Text.Substring(j, 1));                    write = IC.swr_4442(icdev, 33 + j, textBox1.Text.Length, &str);                }                if (write == 0)                {                    int beep = IC.dv_beep(icdev, 20);  //发出蜂鸣声                    MessageBox.Show("数据已成功写入ＩＣ卡中！");                }                else                {                    MessageBox.Show("数据写入ＩＣ卡失败！");                }            }            int d = IC.ic_exit(icdev);  //关闭设备            //根据卡号，查找相应数据            OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + "price.mdb" + ";Persist Security Info=False");            OleDbDataAdapter dap = new OleDbDataAdapter("select * from worker where ICID=‘" + textBox1.Text + "‘", con);            DataSet ds = new DataSet();            dap.Fill(ds, "table");            if (ds.Tables.Count > 0)            {                textBox2.Text = ds.Tables[0].Rows[0][0].ToString();                textBox3.Text = ds.Tables[0].Rows[0][1].ToString();                textBox4.Text = ds.Tables[0].Rows[0][2].ToString();                textBox5.Text = ds.Tables[0].Rows[0][3].ToString();            }            else            {                 MessageBox.Show("不存在该用户！");            }        }        private void button2_Click(object sender, EventArgs e)        {            Application.Exit();        }    }}