using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
namespace SerialPortCom
{
public class SerialPortComImplement
{
public delegate void RecEventHandler(byte[] queueByte);
public event RecEventHandler DataReceivedEvent;
private SerialPort serialPort;
private List<byte> buffer = new List<byte>(4096);
/// <summary>
/// 初始化
/// </summary>
/// <param name="portName">端口名称</param>
/// <param name="baudRate">波特率</param>
/// <param name="dataBits">数据位</param>
public SerialPortComImplement(string portName, int baudRate, int dataBits)
{
serialPort = new SerialPort(portName, baudRate, Parity.None);
serialPort.DataBits = dataBits;
serialPort.StopBits = StopBits.One;
serialPort.ReadTimeout = 2000;
serialPort.WriteBufferSize = 1024;
serialPort.ReadBufferSize = 1024;
serialPort.RtsEnable = true;
serialPort.DtrEnable = true;
serialPort.ReceivedBytesThreshold = 1;
serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceivedEventHandler);
}
/// <summary>
/// 串口数据接收事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void serialPort_DataReceivedEventHandler(object sender, SerialDataReceivedEventArgs e)
{
try
{
byte[] readBuffer = null;
int n = serialPort.BytesToRead;
byte[] buf = new byte[n];
serialPort.Read(buf, 0, n);
//1.缓存数据
buffer.AddRange(buf);
//2.完整性判断
while (buffer.Count >= 7)
{
//至少包含标头(1字节),长度(1字节),校验位(2字节)等等
//2.1 查找数据标记头
if (buffer[0] == 0x00) //传输数据有帧头，用于判断
{
int len = buffer[1];
if (buffer.Count < len + 2)
{
//数据未接收完整跳出循环
break;
}
readBuffer = new byte[len + 2];
//得到完整的数据，复制到readBuffer中
buffer.CopyTo(0, readBuffer, 0, len + 2);
//从缓冲区中清除
buffer.RemoveRange(0, len + 2);
//触发外部处理接收消息事件
}
}
else //开始标记或版本号不正确时清除
{
buffer.RemoveAt(0);
}
}
}
catch (Exception ex)
{
SerialPortLog.Error(ex, "");
}
}
/// <summary>
/// 打开端口
/// </summary>
public bool Open()
{
try
{
if (!serialPort.IsOpen)
{
serialPort.Open();
return true;
}
else
{
return true;
}
}
catch (Exception ex)
{
SerialPortLog.Error(ex, "");
return false;
}
}
/// <summary>
/// 发送字节
/// </summary>
/// <param name="writeBytes">要发送的字节</param>
/// <returns></returns>
public bool Write(byte[] writeBytes)
{
if (Open())
{
try
{
serialPort.Write(writeBytes, 0, writeBytes.Length);
string mergeStr = "发送:";
for (int j = 0; j < writeBytes.Length; j++)
{
mergeStr = mergeStr + writeBytes[j].ToString("x") + " ";
}
SerialPortLog.Info(mergeStr);
return true;
}
catch (Exception ex)
{
SerialPortLog.Error(ex, "");
return false;
}
}
return false;
}
/// <summary>
/// 发送字符串
/// </summary>
/// <param name="writestrs"></param>
/// <returns></returns>
public bool Write(string writeStrs)
{
if (Open())
{
try
{
serialPort.Write(writeStrs);
Thread.Sleep(100);
return true;
}
catch
{
return false;
}
}
return false;
}
/// <summary>
/// 读取数据
/// </summary>
/// <param name="NumBytes">读取的字节数</param>
/// <returns></returns>
public byte[] Read(int NumBytes)
{
byte[] inbuffer = null;
if (serialPort.IsOpen && serialPort.BytesToRead > 0)
{
if (NumBytes > serialPort.BytesToRead)
{
NumBytes = serialPort.BytesToRead;
}
try
{
inbuffer = new byte[NumBytes];
int count = serialPort.Read(inbuffer, 0, NumBytes);
}
catch (TimeoutException timeoutEx)
{
//超时异常
SerialPortLog.Error(timeoutEx, "");
}
}
return inbuffer;
}
public byte[] Read()
{
return Read(serialPort.BytesToRead);
}
public string ReadLine()
{
try
{
if (serialPort.IsOpen && serialPort.BytesToRead > 0)
{
string s = serialPort.ReadExisting();
return serialPort.ReadLine();
}
return null;
}
catch (TimeoutException timeoutEx)
{
SerialPortLog.Error(timeoutEx, "");
return timeoutEx.Message;
}
}
/// <summary>
/// 关闭串口
/// </summary>
public void Close()
{
try
{
if (serialPort.IsOpen)
{
serialPort.Close();
}
}
catch (Exception ex)
{
SerialPortLog.Error(ex, "");
}
}
public bool IsOpen
{
get
{
return serialPort.IsOpen;
}
}
}
}