获取串口数据
1. .net获取，在后端获取后直接显示在页面中或写入数据库，如果需要写入数据库，只需将获取到的accept作为参数向后传递即可
///
/// 获取本机串口列表
///
///
/// GetComlist(bool isUseReg)
{
List list = new List();
try
{
if (isUseReg)
{
RegistryKey RootKey = Registry.LocalMachine;
RegistryKey Comkey = RootKey.OpenSubKey(@"HARDWARE\DEVICEMAP\SERIALCOMM");
String[] ComNames = Comkey.GetValueNames();
foreach (String ComNamekey in ComNames)
{
string TemS = Comkey.GetValue(ComNamekey).ToString();
list.Add(TemS);
}
}
else
{
foreach (string com in SerialPort.GetPortNames()) //自动获取串行口名称
list.Add(com);
}
}
catch
{
MessageBox.Show("串行端口检查异常！");
// System.Environment.Exit(0); //彻底退出应用程序
}
return list;
}
///
/// 判断是否存在当前串口
///
string targetCOMPort = null;
private void StartSerialPortMonitor()
{
List comList = GetComlist(false); //首先获取本机关联的串行端口列表
if (comList.Count == 0)
{
MessageBox.Show("当前设备不存在串行端口！");
// System.Environment.Exit(0); //彻底退出应用程序
}
else
{
targetCOMPort = comList[0];
//string targetCOMPort = "COM3";
//判断串口列表中是否存在目标串行端口
if (!comList.Contains(targetCOMPort))
{
MessageBox.Show("当前设备不存在配置的串行端口！");
//System.Environment.Exit(0); //彻底退出应用程序
}
}
}
///
/// 设置通讯串口
///
SerialPort serialPort = new SerialPort();
public void setcom()
{
try
{
StartSerialPortMonitor();
serialPort = new SerialPort(targetCOMPort);
serialPort.PortName = targetCOMPort; //通信端口
serialPort.BaudRate = 115200; //串行波特率
serialPort.DataBits = 8; //每个字节的标准数据位长度
serialPort.StopBits = StopBits.One; //设置每个字节的标准停止位数
serialPort.Parity = Parity.None; //设置奇偶校验检查协议
//下面这句是当信息中有汉字时，能正确传输，不然会出现问号。
//对编码进行注册GB2312;
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
serialPort.Encoding = System.Text.Encoding.GetEncoding("GB2312");
//串口控件成员变量，字面意思为接收字节阀值，
//串口对象在收到这样长度的数据之后会触发事件处理函数
//一般都设为1
serialPort.ReceivedBytesThreshold = 1;
serialPort.DataReceived += new SerialDataReceivedEventHandler(CommDataReceived); //设置数据接收事件（监听）
serialPort.Open(); //打开串口
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
///
/// 发送数据
///
///
/* private void SendData(string sendData)
{
try
{
serialPort.Encoding = EncodingType;
serialPort.Write(sendData);
}
catch (Exception e)
{
throw e;
}
}*/
///
/// 通讯有数据进执行
///
///
///
private void CommDataReceived(Object sender, SerialDataReceivedEventArgs e)
{
getcom();
}
//通过串口读取数据，处理数据
string accept = null;
StringBuilder sup = new StringBuilder();
int j;
public void getcom()
{
try
{
//定义一个字段，来保存串口传来的信息。
string str = "";
int len = serialPort.BytesToRead;
Byte[] readBuffer = new Byte[len];
serialPort.Read(readBuffer, 0, len);
str = Encoding.Default.GetString(readBuffer);
for (j = 0; j < str.Length; j++)
{
if (str[j] == '=')
break;
}
for (int i = j + 1; i < j + 5; i++)
{
sup.Append(str[i]);
}
accept = sup.ToString();
sup = null;
str = "";
serialPort.DiscardInBuffer(); //清空接收缓冲区
serialPort.Close();
}
catch (Exception ex)
{
serialPort.Close();
}
}
///
/// 获取温度
///
/// GetTemp(int Id, string Type)
{
setcom();
if (!serialPort.IsOpen)
{
serialPort.Open();
}
getcom();
if (serialPort.IsOpen)
{
SerialPort serialPort = new SerialPort();
serialPort.Close();
}
string result = accept;
bool success = _TempRepository.GetTemp(Id, Type, accept);
if(success == true)
{
return result;
}
else
{
return result;
}
} 2.winform串口助手
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO;
using System.Runtime.InteropServices;
using main;
namespace message
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
System.Threading.Thread.Sleep(2000);//延时200ms等待接收完数据
}
#region 初始化窗体
private void Form1_Load(object sender, EventArgs e)
{
try
{
string[] str = SerialPort.GetPortNames(); //获取连接到电脑的串口号并存进数组
comboBox_PortNames.Items.Clear(); //清除串口号下拉框的内容
comboBox_PortNames.Items.AddRange(str); //将串口号添加到下拉框
if (str.Length > 0)
{
comboBox_PortNames.SelectedIndex = 0; //设置ComboBox框的初始值
comboBox_BaudRate.SelectedIndex = 7;
comboBox_DataBit.SelectedIndex = 3;
comboBox_StopBit.SelectedIndex = 0;
comboBox_Parity.SelectedIndex = 2;
}
else
{
MessageBox.Show("当前无串口连接！");
}
}
catch
{
MessageBox.Show("无串口设备!\r\n请检查是否连接设备!\r\n请检查设备驱动!");
}
}
#endregion
/**************************************************************************/
#region 接收串口数据
/*
开辟缓存区 根据具体协议内容获取一帧数据进行接收中断处理
*/
//变量
List sp_buffer = new List(64); //串口缓存区
int sp_buffer_max = 64; //串口缓存区最大缓存字节数
byte[] ruffer = new byte[9192]; //用来存放缓冲区的数据流
private void SerialDataReceive(object sender, SerialDataReceivedEventArgs e)
{
if (serialPort1.IsOpen == false)
{
serialPort1.Close();
return;
}
int Byte_len = serialPort1.BytesToRead; //读取缓存的数据长度
byte[] Rc_byte = new byte[Byte_len];
serialPort1.Read(Rc_byte, 0, Byte_len); //将缓存数据存储进字节数组里面
sp_buffer.AddRange(Rc_byte); //存入缓存区
if (sp_buffer.Count > sp_buffer_max) //缓存超过字节数 先丢弃前面的字节
sp_buffer.RemoveRange(0, sp_buffer_max); //丢弃前面的字节0到sp_buffer_max
// byte[] ruffer = new byte[9192]; //用来存放缓冲区的数据流
//对数据流进行筛选，缓冲区每一组数据个数大于4则为我们想要的数据流
if (sp_buffer.Count > 4)
{
sp_buffer.CopyTo(0, ruffer, 0, sp_buffer.Count);
Task.Run(() => printf_data(ruffer, sp_buffer.Count, 1)); //打印数据流
}
}
#endregion
/**************************************************************************/
string strplus = null;
#region 打印数据流
void printf_data(byte[] Frame, int Length, int T_R) //打印串口数据
{
Int16 i_len;
StringBuilder s = new StringBuilder();
if (T_R == 0)
s.Append("发送：" + "\r\n");
else
s.Append("接收：" + "\r\n");
//清除无用多余的数据
/* int i = 0;
for (i = 0; i
{
if (richTextBox_Receive.Lines.Count() > 20)
richTextBox_Receive.Clear();
richTextBox_Receive.AppendText(str_show);
});
BeginInvoke(mi);
/*
richTextBox_Receive.Focus(); //获取焦点
richTextBox_Receive.Select(richTextBox_Receive.TextLength, 0);//光标
richTextBox_Receive.ScrollToCaret(); //滚动条
*/
}
#endregion
public void timer1_Tick(object sender, EventArgs e)
{
byte[] ruffer = new byte[9192];
}
private void richTextBox_Receive_TextChanged(object sender, EventArgs e)
{
}
private void comboBox_PortNames_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void richTextBox_Send_TextChanged(object sender, EventArgs e)
{
}
/**************************************************************************/
#region 打开串口
private void button_OpenOrClose_Click_1(object sender, EventArgs e)
{
if (!serialPort1.IsOpen)
{
if (comboBox_PortNames.SelectedItem == null)
{
MessageBox.Show("请选择正确的串口", "提示");
return;
}
//设置串口参数
serialPort1.PortName = comboBox_PortNames.Text.ToString(); //serialPort1是serialPort组件的Name
serialPort1.BaudRate = Convert.ToInt32(comboBox_BaudRate.SelectedItem.ToString());
serialPort1.DataBits = Convert.ToInt32(comboBox_DataBit.SelectedItem.ToString());
//设置停止位
if (comboBox_StopBit.Text == "One")
{
serialPort1.StopBits = StopBits.One;
}
else if (comboBox_StopBit.Text == "Two")
{
serialPort1.StopBits = StopBits.Two;
}
else if (comboBox_StopBit.Text == "OnePointFive")
{
serialPort1.StopBits = StopBits.OnePointFive;
}
else if (comboBox_StopBit.Text == "None")
{
serialPort1.StopBits = StopBits.None;
}
//设置奇偶校验位
if (comboBox_Parity.Text == "Odd")
{
serialPort1.Parity = Parity.Odd;
}
else if (comboBox_Parity.Text == "Even")
{
serialPort1.Parity = Parity.Even;
}
else if (comboBox_Parity.Text == "None")
{
serialPort1.Parity = Parity.None;
}
try
{
//禁止操作组件
comboBox_PortNames.Enabled = false;
comboBox_BaudRate.Enabled = false;
comboBox_DataBit.Enabled = false;
comboBox_StopBit.Enabled = false;
comboBox_Parity.Enabled = false;
button_Serach.Enabled = false;
serialPort1.Open(); //设置完参数后打开串口
button_OpenOrClose.Text = "关"; //更改Open按钮文本内容
}
catch
{
MessageBox.Show("串口打开失败！");
}
serialPort1.DataReceived += new SerialDataReceivedEventHandler(SerialDataReceive); //打开串口后绑定数据接收
}
else if (button_OpenOrClose.Text == "关")
{
try
{
//允许操作组件
comboBox_PortNames.Enabled = true;
comboBox_BaudRate.Enabled = true;
comboBox_DataBit.Enabled = true;
comboBox_StopBit.Enabled = true;
comboBox_Parity.Enabled = true;
button_Serach.Enabled = true;
serialPort1.DiscardInBuffer(); //清除缓冲区的数据
serialPort1.Close();
button_OpenOrClose.Text = "开"; //更改Close按钮文本内容
}
catch
{
MessageBox.Show("串口打开失败！");
}
}
}
#endregion
/**************************************************************************/
#region 清除输出框
private void button_CLEAR_Click(object sender, EventArgs e)
{
richTextBox_Receive.Clear(); //清楚数据接收框数据
}
#endregion
/**************************************************************************/
#region 搜索串口（与初始化函数一样）
private void button_Serach_Click_1(object sender, EventArgs e)
{
try
{
string[] str = SerialPort.GetPortNames();
comboBox_PortNames.Items.Clear();
comboBox_PortNames.Items.AddRange(str);
if (str.Length > 0)
{
comboBox_PortNames.SelectedIndex = 0;
comboBox_BaudRate.SelectedIndex = 7;
comboBox_DataBit.SelectedIndex = 3;
comboBox_StopBit.SelectedIndex = 0;
comboBox_Parity.SelectedIndex = 2;
}
else
{
MessageBox.Show("当前无串口连接！");
}
}
catch
{
MessageBox.Show("无串口设备!\r\n请检查是否连接设备!\r\n请检查设备驱动!");
}
}
#endregion
/**************************************************************************/
#region 发送数据
private void button_Send_Click_1(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
string[] sendbuff = richTextBox_Send.Text.Split(); //分割输入的字符串，判断有多少个字节需要发送
int Buff_Len = sendbuff.Length;
byte[] buff = new byte[Buff_Len];
for (int i = 0; i < sendbuff.Length; i++)
{
buff[i] = byte.Parse(sendbuff[i], System.Globalization.NumberStyles.HexNumber); //格式化字符串为十六进制数值
}
try
{
serialPort1.Write(buff, 0, buff.Length); //写数据
Task.Run(() => printf_data(buff, Buff_Len, 0));
}
catch
{
MessageBox.Show("发送失败！！");
}
}
else
{
MessageBox.Show("串口未打开！");
}
}
private void updateSQL_Tick(object sender, EventArgs e)
{
string sqlupdate = null;
StringBuilder sqlmess = new StringBuilder();
for (int j = 13; j < 20; j++)
{
sqlmess.Append(strplus[j]);
}
sqlupdate = sqlmess.ToString();
Dao dao = new Dao();
string sql = $"update dbo.Temp set Temperature = '{sqlupdate}' where No = '1'";
IDataReader dc = dao.read(sql);
dc.Close();
dao.DaoClose();
}
#endregion
/**************************************************************************/
}
}
效果图1（有连接）
效果图2（无连接）
