C# 串口通信 小白(附源码)
实习刚接触C#，学长让了解一下串口通信，在网上看了很多教程后，
用vspd提供虚拟串口，使用vs2017写C# 串口调试小工具
VSPD虚拟串口工具 密码:ag5f
源码 密码:8ubn
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.Windows.Forms;
namespace ChuanKou2
{
public partial class Form1 : Form
{
SerialPort sp = null; //声明串口类
bool isOpen = false; //打开串口标志
bool isSetProperty = false; //属性设置标志
bool isHex = false; //十六进制显示标志位
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.MaximumSize = this.Size;
this.MinimumSize = this.Size;
this.MaximizeBox = false;
for (int i=0;i<10;i++)
{
cbxCOMPort.Items.Add("COM" + (i + 1).ToString());
}
}
private void btnCheckCOM_Click(object sender, EventArgs e) //检测有哪串口
{
bool comExistence = false; //是否有可用的串口
cbxCOMPort.Items.Clear(); //清除当前串口号中的所有串口名称
for(int i=0;i<10;i++)
{
try
{
SerialPort sp = new SerialPort("COM" + (i + 1).ToString());
sp.Open();
sp.Close();
cbxCOMPort.Items.Add("COM" + (i + 1).ToString());
comExistence = true;
}
catch (Exception)
{
continue;
}
}
if (comExistence)
{
cbxCOMPort.SelectedIndex = 0;//使ListBox显示第一个添加的索引
}
else
{
MessageBox.Show("没有找到可用串口！","错误提示");
}
}
private bool CheckPortSetting() //串口是否设置
{
if (cbxCOMPort.Text.Trim() == "") return false;
if (cbxBaudRate.Text.Trim() == "") return false;
if (cbxDataBits.Text.Trim() == "") return false;
if (cbxParitv.Text.Trim() == "") return false;
if (cbxStopBits.Text.Trim() == "") return false;
return true;
}
private bool CheckSendData()
{
if (tbxSendData.Text.Trim() == "") return false;
return true;
}
private void SetPortProPerty() //设置串口属性
{
sp = new SerialPort();
sp.PortName = cbxCOMPort.Text.Trim(); //串口名
sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim());//波特率
float f = Convert.ToSingle(cbxStopBits.Text.Trim());//停止位
if (f == 0)
{
sp.StopBits = StopBits.None;
}
else if (f == 1.5)
{
sp.StopBits = StopBits.OnePointFive;
}
else if (f == 1)
{
sp.StopBits = StopBits.One;
}
else if (f == 2)
{
sp.StopBits = StopBits.Two;
}
else
{
sp.StopBits = StopBits.One;
}
sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim());//数据位
string s = cbxParitv.Text.Trim(); //校验位
if (s.CompareTo("无") == 0)
{
sp.Parity = Parity.None;
}
else if (s.CompareTo("奇校验") == 0)
{
sp.Parity = Parity.Odd;
}
else if (s.CompareTo("偶校验") == 0)
{
sp.Parity = Parity.Even;
}
else
{
sp.Parity = Parity.None;
}
sp.ReadTimeout = -1; //设置超时读取时间
sp.RtsEnable = true;
//定义DataReceived事件，当串口收到数据后触发事件
sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
if (rbnHex.Checked)
{
isHex = true;
}
else
{
isHex = false;
}
void sp_DataReceived(object sender,SerialDataReceivedEventArgs e)
{
System.Threading.Thread.Sleep(100); //延时100ms等待接收数据
//this.Invoke 跨线程访问ui的方法
this.Invoke((EventHandler)(delegate
{
if (isHex == false)
{
tbxRecvData.Text += sp.ReadLine();
}
else
{
Byte[] ReceivedData = new Byte[sp.BytesToRead];
sp.Read(ReceivedData, 0, ReceivedData.Length);
String RecvDataText = null;
for(int i = 0; i < ReceivedData.Length - 1; i++)
{
RecvDataText += ("0x" + ReceivedData[i].ToString("X2") + "");
}
tbxRecvData.Text += RecvDataText;
}
sp.DiscardInBuffer(); //丢弃接收缓冲区数据
}));
}
}
private void btnSend_Click(object sender, EventArgs e) //发送数据
{
if (isOpen)
{
try
{
sp.WriteLine(tbxSendData.Text);
}
catch(Exception)
{
MessageBox.Show("发送数据时发生错误！", "错误提示");
return;
}
}
else
{
MessageBox.Show("串口未打开", "错误提示");
return;
}
if (!CheckSendData())
{
MessageBox.Show("请输入要发送的数据!", "错误提示");
return;
}
}
private void btnOpenCom_Click(object sender, EventArgs e)
{
if (isOpen == false)
{
if (!CheckPortSetting()) //检测串口设置
{
MessageBox.Show("串口未设置！", "错误提示");
return;
}
if (!isSetProperty) //串口未设置则设置串口
{
SetPortProPerty();
isSetProperty = true;
}
try
{
sp.Open();
isOpen = true;
btnOpenCom.Text = "关闭串口";
//串口打开后则相关串口设置按钮便不可再用
cbxCOMPort.Enabled = false;
cbxBaudRate.Enabled = false;
cbxDataBits.Enabled = false;
cbxParitv.Enabled = false;
cbxStopBits.Enabled = false;
rbnChar.Enabled = false;
rbnHex.Enabled = false;
}
catch (Exception)
{
//打开串口失败后，相应标志位取消
isSetProperty = false;
isOpen = false;
MessageBox.Show("串口无效或已被占用！", "错误提示");
}
}
else
{
try //关闭串口
{
sp.Close();
isOpen = false;
btnOpenCom.Text = "打开串口";
//关闭串口后，串口设置选项可以继续使用
cbxCOMPort.Enabled = true;
cbxBaudRate.Enabled = true;
cbxDataBits.Enabled = true;
cbxParitv.Enabled = true;
cbxStopBits.Enabled = true;
rbnChar.Enabled = true;
rbnHex.Enabled = true;
}
catch (Exception)
{
MessageBox.Show("关闭串口时发生错误！", "错误提示");
}
}
}
private void btnCleanData_Click(object sender, EventArgs e)
{
tbxRecvData.Text = "";
tbxSendData.Text = "";
}
}
}