C# 条码扫描仪串口编程，获取条形码数据！！！大虾们，帮忙下！！

Question

Ｃ＃２００５　程序　用serialPort1控件
条码扫描仪扫描下条形码，读出条形码信息（唯一商品编号,例如* kele-001 *），并更改该商品在数据库中的库存。
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
我查到有这样个方法，但不知道具体怎么用。谁能给出段具体代码，要代码。
代码关键：我声明个string strNO = ""; ,如何获取strNO = "* kele-001 *" 这个过程。
另外，还有没有串口通信该注意的事项。例如一旦com1口接收到数据，程序会不会死掉，如何避免等。

Answer 1

串口接收到的是位元組，SerialPort 中相關函式可以查看收到多少位元組，若程式寫的正確是不會死掉的。建議你寫一段簡單的串口操作(open, close, read, write)程式，實際演練就會知道怎回事了。
網路有很多串口的教學，供你參考。

Answer 2

using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;
using System.Threading;
using System.Windows.Forms;namespace BHTC_Packing
{
    public class Scanner
    {
        public SerialPort s_Serial;
        public bool scanCOMIsOK = true;
        public string s_buffer = string.Empty;
        public bool readCode = false;        public delegate void OnSerialNumberReceivedHandle(string sn);
        public event OnSerialNumberReceivedHandle OnSerialNumberRecieved;        private string data = string.Empty;
        public string Data
        {
            get
            {
                return data;
            }
        }        public bool Init()
        {
            try
            {
                if (!s_Serial.IsOpen)
                {
                    s_Serial.Open();
                    scanCOMIsOK = true;
                }
            }
            catch
            {
                scanCOMIsOK = false;
            }            return scanCOMIsOK;
        }        public Scanner()
        {
            string scanComPort = BHTC_Packing.Properties.Settings.Default.Scanner_Port;
            int scanBaudRate = BHTC_Packing.Properties.Settings.Default.Scanner_BaudRate;            s_Serial = new SerialPort();
            s_Serial.PortName = scanComPort;
            s_Serial.BaudRate = scanBaudRate;
            s_Serial.DataBits = 7;
            s_Serial.StopBits =  StopBits.One;
            s_Serial.Parity = Parity.Even;
            s_Serial.Handshake = Handshake.None;            s_Serial.DataReceived += new SerialDataReceivedEventHandler(s_Serial_DataReceived);
        }        void s_Serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //Thread.Sleep(500);
            string temp = s_Serial.ReadExisting();
            Thread.Sleep(200);
            s_buffer += temp;            if (s_buffer.IndexOf("\r") >= 0)
            {
                readCode = true;
                data=s_buffer;                if (OnSerialNumberRecieved != null)
                {
                    OnSerialNumberRecieved(s_buffer.Replace("\r", string.Empty));
                }
            }
        }
        public void openScaner()
        {
            readCode = false;
            s_buffer = string.Empty;            byte[] openOrder ={ 0x16, 0x54, 0xD };
            if (!s_Serial.IsOpen)
            {
                s_Serial.Open();
            }
            s_Serial.Write(openOrder, 0, 3);
            //Thread.Sleep(100);        }
        public void closeScaner()
        {
            byte[] closeOrder ={ 0x16, 0x55, 0xD };
            if (!s_Serial.IsOpen)
            {
                s_Serial.Open();
            }
            s_Serial.Write(closeOrder, 0, 3);
            //Thread.Sleep(100);
        }        public bool CodeReceived
        {
            get
            {
                return readCode;
            }
        }
    }
}