C#串口通信读入的数据显示不正常，求大佬帮忙看看哪儿出现问题了
C#串口通信读入的数据显示不正常，求大佬帮忙看看哪儿出现问题了https://attach.52pojie.cn//forum/202005/24/071832aejrlef6vlrfzc3r.png?l
VS2015项目源程序连接：https://lanzouj.com/icxz9od，
.cs代码段如下
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
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 dotNet实现与扫码枪USB通讯
{
public partial class FrmMain : Form
{
public FrmMain()
{
InitializeComponent();
this.Load += FrmMain_Load;
}
private void FrmMain_Load(object sender, EventArgs e)
{
}
NewLandSerial newland;
private string portNo;
private void tsb_Connect_Click(object sender, EventArgs e)
{
newland = new NewLandSerial();
//4、绑定方法
newland.myShowMsg += ShowMsg;
portNo = ConfigurationManager.AppSettings["Port"].ToString();
if (newland.OpenMyComm(9600, portNo, 8, Parity.None, StopBits.One))
{
MessageBox.Show("连接成功", "建立连接");
this.tsb_Connect.Enabled = false;
this.tsb_DisConnect.Enabled = true;
}
else
{
MessageBox.Show("连接失败", "建立连接");
}
}
private void tsb_ParaSet_Click(object sender, EventArgs e)
{
new FrmSet().ShowDialog();
}
private void tsb_DisConnect_Click(object sender, EventArgs e)
{
if (newland.CloseMyComm())
{
MessageBox.Show("断开连接成功", "断开连接");
this.tsb_Connect.Enabled = true;
this.tsb_DisConnect.Enabled = false;
}
else
{
MessageBox.Show("断开连接失败", "断开连接");
}
}
//3、根据委托类型创建方法
private void ShowMsg(string Msg)
{
Invoke(new Action(() =>
{
this.txt_Info.AppendText(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + " " + Msg + Environment.NewLine);
}));
}
}
}
using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace dotNet实现与扫码枪USB通讯
{
//1、创建委托
public delegate void ShowMsgDelegate(string Msg);
public class NewLandSerial
{
//创建串口对象
private SerialPort MyComm;
//2、创建委托对象
public ShowMsgDelegate myShowMsg;
public NewLandSerial()
{
MyComm = new SerialPort();
}
//打开串口方法
public bool OpenMyComm(int iBaudRate,string PortNo,int DataBits,Parity iParity,StopBits istopbit)
{
try
{
if (MyComm.IsOpen)
{
MyComm.Close();
}
MyComm.BaudRate = iBaudRate;
MyComm.PortName = PortNo;
MyComm.DataBits = DataBits;
MyComm.Parity = iParity;
MyComm.StopBits = istopbit;
MyComm.ReceivedBytesThreshold = 1; //每次只读一个字节
MyComm.DataReceived += MyComm_DataReceived;
MyComm.Open();
return true;
}
catch (System.Exception ex)
{
return false;
}
}
byte mReceivedByte;
byte[] bData = new byte;
int mReceivedByteCount = 0;
private void MyComm_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
//接收数据
while (MyComm.BytesToRead>0)
{
mReceivedByte = (byte)MyComm.ReadByte();
bData = mReceivedByte;
mReceivedByteCount += 1;
//异常处理，一次性字节太多
if (mReceivedByteCount >= 1024)
{
mReceivedByteCount = 0;
//清除输入缓冲区
MyComm.DiscardInBuffer();
return;
}
}
//正常处理
if (mReceivedByteCount > 0)
{
byte[] b = GetByteArray(bData, 0, mReceivedByteCount);
//5、调用委托
myShowMsg(Encoding.ASCII.GetString(b));
}
}
/// <summary>
/// 自定义截取字节数组
/// </summary>
/// <param name="byteArr"></param>
/// <param name="start"></param>
/// <param name="length"></param>
/// <returns></returns>
private byte[] GetByteArray(byte[] byteArr,int start,int length)
{
byte[] Res = new byte;
if (byteArr != null && byteArr.Length >= length)
{
for (int i = 0;i<length;i++)
{
Res = byteArr;
}
}
return Res;
}
public bool CloseMyComm()
{
if (MyComm.IsOpen)
{
MyComm.Close();
}
return true;
}
}
}
我也不懂，只是看着应该是前面发送的数据没自动停止，一直发送数据，比如第5次发送的，前4次的也在重复发送 要么串口缓存没清除 , 要么你的读取变量没清除 学习找答案 If m_csSerialPort.BytesToRead > 0 Then
Threading.Thread.Sleep(100) '增加延迟防止数据减少
strDat = m_csSerialPort.ReadExisting.ToString '读取缓冲区中的数据
m_csSerialPort.DiscardInBuffer()
End If
我是直接用的SerialPort控件做的 岔路ko 发表于 2020-5-24 09:07
If m_csSerialPort.BytesToRead > 0 Then
Threadi ...
private void MyComm_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
System.Threading.Thread.Sleep(100);
string response = MyComm.ReadExisting();
MyComm.DiscardInBuffer();
myShowMsg(response);
}
基于你的程序修改的，测试OK 清缓存，复循 学习中......学习中...... 139行的 int mReceivedByteCount = 0;应放入紧挨着的MyComm_DataReceived函数内
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