本次開發主要做了從串列埠分別獲取讀者卡號和圖書卡號，實現圖書管理，圖書借閱，讀者管理等功能。開發語言是C#，開發環境使用Visual Studio 2015。資料庫採用sql Server。

　　RFID選擇

　　讀者卡跟圖書卡均採用125K，一般稱之為低頻卡，典型的代表智慧卡是EM公司與HID公司的125K智慧卡。這類卡基本上都是隻讀、無源卡，識別距離在10cm左右。

應答器採用e5551應答器晶片

e5551晶片是Atmel公司生產的非接觸式、無源、可讀寫、具有防碰撞能力的RFID器件，中心工作頻率為 125K。具有以下主要特性：低功耗、低工作電壓；非接觸能量供給和讀寫資料；工作頻率範圍為100~150 kHz；

　　實現功能：

　　應用主介面： 管理員端、讀者端

　　管理員端：（演示功能為新增圖書）

　　讀者端：實現圖書借閱與圖書歸還

　　　　　　　　　　　　　　　　　　　　　　　（邏輯實現）

　　　　　　　　　　　　　　　　（實現結果）

　　借還實現程式碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using System.Windows.Forms;
using System.Threading;

namespace MyRFID
{
    public partial class frmBorrowBook : Form
    {
        BaseClass.BaseInfo baseinfo = new MyRFID.BaseClass.BaseInfo();//建立BaseInfo類的物件
        BaseClass.BaseInfo.cBorrowSituation BorrowSituation = new MyRFID.BaseClass.BaseInfo.cBorrowSituation();//建立cBorrowSituation類的物件
        BaseClass.BaseInfo.cBook Book = new MyRFID.BaseClass.BaseInfo.cBook();//建立cBook類

        public delegate void Displaydelegate(byte[] InputBuf);
        Byte[] OutputBuf = new Byte[4];
        public Displaydelegate disp_reader;
        public Displaydelegate disp_book;
        public frmBorrowBook()
        {
            InitializeComponent();
        }

        void Comm_ReaderReceived(object sender, SerialDataReceivedEventArgs e)
        {
            
            Byte[] InputBuf = new Byte[4];
            try
            {
                if (serialReader.IsOpen)
                {
                    serialReader.Read(InputBuf, 0, serialReader.BytesToRead);    //讀取緩衝區的資料直到“}”即0x7D為結束符
                                                                                 //InputBuf = UnicodeEncoding.Default.GetBytes(strRD); //將得到的資料轉換成byte的格式
                    System.Threading.Thread.Sleep(50);
                    this.Invoke(disp_reader, InputBuf);
                }
            }
            catch (TimeoutException ex)         //超時處理
            {
                MessageBox.Show(ex.ToString());
            }
        }

        void Comm_BookReceived(object sender, SerialDataReceivedEventArgs e)
        {
            Byte[] InputBuf = new Byte[4];

            try
            {
                if (serialBook.IsOpen)
                {
                    serialBook.Read(InputBuf, 0, serialBook.BytesToRead);    //讀取緩衝區的資料直到“}”即0x7D為結束符
                                                                             //InputBuf = UnicodeEncoding.Default.GetBytes(strRD); //將得到的資料轉換成byte的格式
                    System.Threading.Thread.Sleep(50);
                    this.Invoke(disp_book, InputBuf);
                }

            }
            catch (TimeoutException ex)         //超時處理
            {
                MessageBox.Show(ex.ToString());
            }
        }

        public void DispReader(byte[] InputBuf)
        {
            //textBox1.Text = Convert.ToString(InputBuf);
            string result = string.Empty;
            string readerno = string.Empty;
            string selectReader = "";
            string selectBorrow = "";

            BaseOperate bop = new BaseOperate();
            SqlDataReader reader;
            DataSet ds = new DataSet();
            ASCIIEncoding encoding = new ASCIIEncoding();
            for (int i = 0; i < InputBuf.Length; i++)//逐位元組變為16進位制字元，以%隔開
            {
                result += Convert.ToString(InputBuf[i], 16);
            }
            readerno = int.Parse(result, System.Globalization.NumberStyles.AllowHexSpecifier).ToString();
            selectReader = "select * from readerInfo where readerNo='" + readerno + "'";
            reader = bop.getread(selectReader);

            while (reader.Read())
            {
                readerNo.Text = reader.GetString(0);
                readerName.Text = reader.GetString(1);
            }

            selectBorrow = "select bookNo 書號,bookName 書名,author 作者, publisher 出版社,borrowDate 借出時間,returnDate 應歸還時間 from borrowSituation where readerNo='" + readerno + "'";
            ds=bop.getds(selectBorrow,"borrowSituation");
            dataGridView1.DataSource = null;
            dataGridView1.DataSource = ds.Tables["borrowSituation"];
        }

        public void DispBook(byte[] InputBuf)
        {
            //textBox1.Text = Convert.ToString(InputBuf);
            string result = string.Empty;
            string bookNo = string.Empty;
            string bookName = "";
            string author = "";
            string publisher = "";
            string borrowDate = "";
            string returnDate = "";
            string sqlselect = "";

            BaseOperate bop = new BaseOperate();
            SqlDataReader reader;
            ASCIIEncoding encoding = new ASCIIEncoding();
            for (int i = 0; i < InputBuf.Length; i++)//逐位元組變為16進位制字元，以%隔開
            {
                result += Convert.ToString(InputBuf[i], 16);
            }
            bookNo = int.Parse(result, System.Globalization.NumberStyles.AllowHexSpecifier).ToString();

            //獲取該圖書的資訊
            sqlselect = "select * from bookInfo where bookNo='" + bookNo + "'";
            reader = bop.getread(sqlselect);
            while (reader.Read())
            {
                bookName = reader.GetString(1);
                author = reader.GetString(2);
                publisher = reader.GetString(3);
                borrowDate = DateTime.Now.Date.ToShortDateString();
                returnDate = DateTime.Now.AddDays(30).ToShortDateString();
            }

            sqlselect = "select * from borrowSituation where bookNo='" + bookNo + "'";
            reader = bop.getread(sqlselect);
            while (reader.Read())
            {
                readerNo.Text = reader.GetString(0);
                readerName.Text = reader.GetString(1);
            }
            //借書操作
            if (!reader.HasRows)
            {
                if (readerNo.Text != "")
                {
                    string insert = "";

                    
                    insert = "insert into borrowSituation values('" + readerNo.Text + "','" + readerName.Text
                        + "','" + bookNo + "','" + bookName + "','" + author + "','" + publisher + "','" + borrowDate +
                        "','" + returnDate + "')";
                    bop.getcom(insert);

                    string selectBorrow = "select bookNo 書號,bookName 書名,author 作者, publisher 出版社,borrowDate 借出時間,returnDate 應歸還時間 from borrowSituation where readerNo='" + readerNo.Text + "'";
                    DataSet ds = new DataSet();
                    ds = bop.getds(selectBorrow, "borrowSituation");
                    dataGridView1.DataSource = null;
                    dataGridView1.DataSource = ds.Tables["borrowSituation"];
                }
                else
                    MessageBox.Show("請先放入讀者卡，在放入書籍");
            }
            //還書操作
            else
            {
                string sqlDelete = "";
                string sqlInsert = "";

                sqlDelete = "delete from borrowSituation where bookNo='" + bookNo + "'";
                bop.getcom(sqlDelete);

                sqlInsert= "insert into returnSituation values('" + readerNo.Text + "','" + readerName.Text
                        + "','" + bookNo + "','" + bookName + "','" + author + "','" + publisher + "','" + borrowDate +
                        "','" + DateTime.Now.ToShortDateString() + "')";
                bop.getcom(sqlInsert);

                string selectBorrow = "select bookNo 書號,bookName 書名,author 作者, publisher 出版社,borrowDate 借出時間,returnDate 應歸還時間 from borrowSituation where readerNo='" + readerNo.Text + "'";
                DataSet ds = new DataSet();
                ds = bop.getds(selectBorrow, "borrowSituation");
                dataGridView1.DataSource = null;
                dataGridView1.DataSource = ds.Tables["borrowSituation"];
            }
        }

        private void frmBorrowBook_Load(object sender, EventArgs e)
        {
            serialReader.DataReceived += new SerialDataReceivedEventHandler(Comm_ReaderReceived);
            serialBook.DataReceived += new SerialDataReceivedEventHandler(Comm_BookReceived);
            disp_reader = new Displaydelegate(DispReader);
            disp_book = new Displaydelegate(DispBook);
            serialReader.Open();
            serialBook.Open();
        }

        private void close_Click(object sender, EventArgs e)
        {
            serialBook.Close();
            serialReader.Close();
            this.Close();
        }
    }
}