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c#串口通信（opencv入门教程）

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串口进行操作的类，其中包括写和读操作，类可设置串口参数、设置接收函数、打开串口资源、关闭串口资源,操作完成后,一定要关闭串口、接收串口数据事件、接收数据出错事件、获取当前全部串口、把字节型转换成十六进制字符串等功能。这个串口类已经过了调试，可以使用：

C#串口操作类，包括串口读写操作

using System;

using System.Collections.Generic;

using System.Text;

using System.IO.Ports;

using System.Globalization;

namespace SerialClass

{

public class SerialClass

{

SerialPort _serialPort = null;

//定义委托

public delegate void SerialPortDataReceiveEventArgs(object sender, SerialDataReceivedEventArgs e, byte[] bits);

//定义接收数据事件

public event SerialPortDataReceiveEventArgs DataReceived;

//定义接收错误事件

//public event SerialErrorReceivedEventHandler Error;

//接收事件是否有效 false表示有效

public bool ReceiveEventFlag = false;

#region 获取串口名

private string protName;

public string PortName

{

get { return _serialPort.PortName; }

set

{

_serialPort.PortName = value;

protName = value;

}

}

#endregion

#region 获取比特率

private int baudRate;

public int BaudRate

{

get { return _serialPort.BaudRate; }

set

{

_serialPort.BaudRate = value;

baudRate = value;

}

}

#endregion

#region 默认构造函数

/// <summary>

/// 默认构造函数，操作COM1，速度为9600，没有奇偶校验，8位字节，停止位为1 “COM1”, 9600, Parity.None, 8, StopBits.One

/// </summary>

public SerialClass()

{

_serialPort = new SerialPort();

}

#endregion

#region 构造函数

/// <summary>

/// 构造函数,

/// </summary>

/// <param name=”comPortName”></param>

public SerialClass(string comPortName)

{

_serialPort = new SerialPort(comPortName);

_serialPort.BaudRate = 9600;

_serialPort.Parity = Parity.Even;

_serialPort.DataBits = 8;

_serialPort.StopBits = StopBits.One;

_serialPort.Handshake = Handshake.None;

_serialPort.RtsEnable = true;

_serialPort.ReadTimeout = 2000;

setSerialPort();

}

#endregion

#region 构造函数,可以自定义串口的初始化参数

/// <summary>

/// 构造函数,可以自定义串口的初始化参数

/// </summary>

/// <param name=”comPortName”>需要操作的COM口名称</param>

/// <param name=”baudRate”>COM的速度</param>

/// <param name=”parity”>奇偶校验位</param>

/// <param name=”dataBits”>数据长度</param>

/// <param name=”stopBits”>停止位</param>

public SerialClass(string comPortName, int baudRate, Parity parity, int dataBits, StopBits stopBits)

{

_serialPort = new SerialPort(comPortName, baudRate, parity, dataBits, stopBits);

_serialPort.RtsEnable = true; //自动请求

_serialPort.ReadTimeout = 3000;//超时

setSerialPort();

}

#endregion

#region 析构函数

/// <summary>

/// 析构函数，关闭串口

/// </summary>

~SerialClass()

{

if (_serialPort.IsOpen)

_serialPort.Close();

}

#endregion

#region 设置串口参数

/// <summary>

/// 设置串口参数

/// </summary>

/// <param name=”comPortName”>需要操作的COM口名称</param>

/// <param name=”baudRate”>COM的速度</param>

/// <param name=”dataBits”>数据长度</param>

/// <param name=”stopBits”>停止位</param>

public void setSerialPort(string comPortName, int baudRate, int dataBits, int stopBits )

{

if (_serialPort.IsOpen)

_serialPort.Close();

_serialPort.PortName = comPortName;

_serialPort.BaudRate = baudRate;

_serialPort.Parity = Parity.None;

_serialPort.DataBits = dataBits;

_serialPort.StopBits = (StopBits)stopBits;

_serialPort.Handshake = Handshake.None;

_serialPort.RtsEnable = false;

_serialPort.ReadTimeout = 3000;

_serialPort.NewLine = “/r/n”;

setSerialPort();

}

#endregion

#region 设置接收函数

/// <summary>

/// 设置串口资源,还需重载多个设置串口的函数

/// </summary>

void setSerialPort()

{

if (_serialPort != null)

{

//设置触发DataReceived事件的字节数为1

_serialPort.ReceivedBytesThreshold = 1;

//接收到一个字节时，也会触发DataReceived事件

_serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived);

//接收数据出错,触发事件

_serialPort.ErrorReceived += new SerialErrorReceivedEventHandler(_serialPort_ErrorReceived);

//打开串口

//openPort();

}

}

#endregion

#region 打开串口资源

/// <summary>

/// 打开串口资源

/// <returns>返回bool类型</returns>

/// </summary>

public bool openPort()

{

bool ok = false;

//如果串口是打开的，先关闭

if (_serialPort.IsOpen)

_serialPort.Close();

try

{

//打开串口

_serialPort.Open();

ok = true;

}

catch (Exception Ex)

{

throw Ex;

}

return ok;

}

#endregion

#region 关闭串口

/// <summary>

/// 关闭串口资源,操作完成后,一定要关闭串口

/// </summary>

public void closePort()

{

//如果串口处于打开状态,则关闭

if (_serialPort.IsOpen)

_serialPort.Close();

}

#endregion

#region 接收串口数据事件

/// <summary>

/// 接收串口数据事件

/// </summary>

/// <param name=”sender”></param>

/// <param name=”e”></param>

void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)

{

//禁止接收事件时直接退出

if (ReceiveEventFlag)

{

return;

}

try

{

System.Threading.Thread.Sleep(20);

byte[] _data = new byte[_serialPort.BytesToRead];

_serialPort.Read(_data, 0, _data.Length);

if (_data.Length == 0) { return; }

if (DataReceived != null)

{

DataReceived(sender, e, _data);

}

//_serialPort.DiscardInBuffer(); //清空接收缓冲区

}

catch (Exception ex)

{

throw ex;

}

}

#endregion

#region 接收数据出错事件

/// <summary>

/// 接收数据出错事件

/// </summary>

/// <param name=”sender”></param>

/// <param name=”e”></param>

void _serialPort_ErrorReceived(object sender, SerialErrorReceivedEventArgs e)

{

}

#endregion

#region 发送数据string类型

public void SendData(string data)

{

//发送数据

//禁止接收事件时直接退出

if (ReceiveEventFlag)

{

return;

}

if (_serialPort.IsOpen)

{

_serialPort.Write(data);

}

}

#endregion

#region 发送数据byte类型

/// <summary>

/// 数据发送

/// </summary>

/// <param name=”data”>要发送的数据字节</param>

public void SendData(byte[] data, int offset, int count)

{

//禁止接收事件时直接退出

if (ReceiveEventFlag)

{

return;

}

try

{

if (_serialPort.IsOpen)

{

//_serialPort.DiscardInBuffer();//清空接收缓冲区

_serialPort.Write(data, offset, count);

}

}

catch (Exception ex)

{

throw ex;

}

}

#endregion

#region 发送命令

/// <summary>

/// 发送命令

/// </summary>

/// <param name=”SendData”>发送数据</param>

/// <param name=”ReceiveData”>接收数据</param>

/// <param name=”Overtime”>超时时间</param>

/// <returns></returns>

public int SendCommand(byte[] SendData, ref byte[] ReceiveData, int Overtime)

{

if (_serialPort.IsOpen)

{

try

{

ReceiveEventFlag = true; //关闭接收事件

_serialPort.DiscardInBuffer(); //清空接收缓冲区

_serialPort.Write(SendData, 0, SendData.Length);

int num = 0, ret = 0;

System.Threading.Thread.Sleep(10);

ReceiveEventFlag = false; //打开事件

while (num++ < Overtime)

{

if (_serialPort.BytesToRead >= ReceiveData.Length)

break;

System.Threading.Thread.Sleep(10);

}

if (_serialPort.BytesToRead >= ReceiveData.Length)

{

ret = _serialPort.Read(ReceiveData, 0, ReceiveData.Length);

}

else

{

ret = _serialPort.Read(ReceiveData, 0, _serialPort.BytesToRead);

}

ReceiveEventFlag = false; //打开事件

return ret;

}

catch (Exception ex)

{

ReceiveEventFlag = false;

throw ex;

}

}

return -1;

}

#endregion

#region 获取串口

/// <summary>

/// 获取所有已连接短信猫设备的串口

/// </summary>

/// <returns></returns>

public string[] serialsIsConnected()

{

List<string> lists = new List<string>();

string[] seriallist = getSerials();

foreach (string s in seriallist)

{

}

return lists.ToArray();

}

#endregion

#region 获取当前全部串口资源

/// <summary>

/// 获得当前电脑上的所有串口资源

/// </summary>

/// <returns></returns>

public string[] getSerials()

{

return SerialPort.GetPortNames();

}

#endregion

#region 字节型转换16

/// <summary>

/// 把字节型转换成十六进制字符串

/// </summary>

/// <param name=”InBytes”></param>

/// <returns></returns>

public static string ByteToString(byte[] InBytes)

{

string StringOut = “”;

foreach (byte InByte in InBytes)

{

StringOut = StringOut + String.Format(“{0:X2} “, InByte);

}

return StringOut;

}

#endregion

#region 十六进制字符串转字节型

/// <summary>

/// 把十六进制字符串转换成字节型(方法1)

/// </summary>

/// <param name=”InString”></param>

/// <returns></returns>

public static byte[] StringToByte(string InString)

{

string[] ByteStrings;

ByteStrings = InString.Split(” “.ToCharArray());

byte[] ByteOut;

ByteOut = new byte[ByteStrings.Length];

for (int i = 0; i <= ByteStrings.Length-1 ; i++)

{

//ByteOut[i] = System.Text.Encoding.ASCII.GetBytes(ByteStrings[i]);

ByteOut[i] = Byte.Parse(ByteStrings[i], System.Globalization.NumberStyles.HexNumber);

//ByteOut[i] =Convert.ToByte(“0x” + ByteStrings[i]);

}

return ByteOut;

}

#endregion

#region 十六进制字符串转字节型

/// <summary>

/// 字符串转16进制字节数组(方法2)

/// </summary>

/// <param name=”hexString”></param>

/// <returns></returns>

public static byte[] strToToHexByte(string hexString)

{

hexString = hexString.Replace(” “, “”);

if ((hexString.Length % 2) != 0)

hexString += ” “;

byte[] returnBytes = new byte[hexString.Length / 2];

for (int i = 0; i < returnBytes.Length; i++)

returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);

return returnBytes;

}

#endregion

#region 字节型转十六进制字符串

/// <summary>

/// 字节数组转16进制字符串

/// </summary>

/// <param name=”bytes”></param>

/// <returns></returns>

public static string byteToHexStr(byte[] bytes)

{

string returnStr = “”;

if (bytes != null)

{

for (int i = 0; i < bytes.Length; i++)

{

returnStr += bytes[i].ToString(“X2”);

}

}

return returnStr;

}

#endregion

}

}

======================================================================================

调用方法：

static SerialClass sc = new SerialClass();

static void Main(string[] Args)

{

sc.DataReceived += new SerialClass.SerialPortDataReceiveEventArgs(sc_DataReceived);

sc.writeData(“at”);

Console.ReadLine();

sc.closePort();

}

static void sc_DataReceived(object sender, SerialDataReceivedEventArgs e, byte[] bits)

{

Console.WriteLine(Encoding.Default.GetString(bits));

}

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