经过测试DataReceived没有触发，接线没有问题，用串口助手可以接收到数显器发送的数据。找不到代码有什么问题，希望能帮我找到问题，能够接收数据。
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;
namespace WindowsFormsApp3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
//批量添加波特率列表
string[] baud = { "9600", "56000", "57600", "115200", "128000", "230400", "256000", "460800" };
comboBox2.Items.AddRange(baud);
//设置默认值
//comboBox1.Text = "COM1";
comboBox2.Text = "9600";
comboBox3.Text = "8";
comboBox4.Text = "None";
comboBox5.Text = "1";
//获取电脑当前可用串口并添加到选项列表中
comboBox1.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
serialPort1.NewLine = "/r/n";
serialPort1.RtsEnable = true;
serialPort1.ReceivedBytesThreshold = 1;
serialPort1.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(this.SerialPort1_DataReceived);
}
private void button1_Click(object sender, EventArgs e)
{
try
{
//将可能产生异常的代码放置在try块中
//根据当前串口属性来判断是否打开
if (serialPort1.IsOpen)
{
//串口已经处于打开状态
serialPort1.Close(); //关闭串口
button1.Text = "打开串口";
button1.BackColor = Color.ForestGreen;
comboBox1.Enabled = true;
comboBox2.Enabled = true;
comboBox3.Enabled = true;
comboBox4.Enabled = true;
comboBox5.Enabled = true;
textBox_receive.Text = ""; //清空接收区
textBox_send.Text = ""; //清空发送区
}
else
{
//串口已经处于关闭状态，则设置好串口属性后打开
comboBox1.Enabled = false;
comboBox2.Enabled = false;
comboBox3.Enabled = false;
comboBox4.Enabled = false;
comboBox5.Enabled = false;
serialPort1.PortName = comboBox1.Text;
serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text);
serialPort1.DataBits = Convert.ToInt16(comboBox3.Text);
if (comboBox4.Text.Equals("None"))
serialPort1.Parity = System.IO.Ports.Parity.None;
else if (comboBox4.Text.Equals("Odd"))
serialPort1.Parity = System.IO.Ports.Parity.Odd;
else if (comboBox4.Text.Equals("Even"))
serialPort1.Parity = System.IO.Ports.Parity.Even;
else if (comboBox4.Text.Equals("Mark"))
serialPort1.Parity = System.IO.Ports.Parity.Mark;
else if (comboBox4.Text.Equals("Space"))
serialPort1.Parity = System.IO.Ports.Parity.Space;
if (comboBox5.Text.Equals("1"))
serialPort1.StopBits = System.IO.Ports.StopBits.One;
else if (comboBox5.Text.Equals("1.5"))
serialPort1.StopBits = System.IO.Ports.StopBits.OnePointFive;
else if (comboBox5.Text.Equals("2"))
serialPort1.StopBits = System.IO.Ports.StopBits.Two;
serialPort1.Open(); //打开串口
button1.Text = "关闭串口";
button1.BackColor = Color.Firebrick;
}
}
catch (Exception ex)
{
//捕获可能发生的异常并进行处理
//捕获到异常，创建一个新的对象，之前的不可以再用
serialPort1 = new System.IO.Ports.SerialPort();
//刷新COM口选项
comboBox1.Items.Clear();
comboBox1.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
//响铃并显示异常给用户
System.Media.SystemSounds.Beep.Play();
button1.Text = "打开串口";
button1.BackColor = Color.ForestGreen;
MessageBox.Show(ex.Message);
comboBox1.Enabled = true;
comboBox2.Enabled = true;
comboBox3.Enabled = true;
comboBox4.Enabled = true;
comboBox5.Enabled = true;
}
}
private void button2_Click(object sender, EventArgs e)
{
try
{
//首先判断串口是否开启
if (serialPort1.IsOpen)
{
//串口处于开启状态，将发送区文本发送
serialPort1.Write(textBox_send.Text);
}
}
catch (Exception ex)
{
//捕获到异常，创建一个新的对象，之前的不可以再用
serialPort1 = new System.IO.Ports.SerialPort();
//刷新COM口选项
comboBox1.Items.Clear();
comboBox1.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
//响铃并显示异常给用户
System.Media.SystemSounds.Beep.Play();
button1.Text = "打开串口";
button1.BackColor = Color.ForestGreen;
MessageBox.Show(ex.Message);
comboBox1.Enabled = true;
comboBox2.Enabled = true;
comboBox3.Enabled = true;
comboBox4.Enabled = true;
comboBox5.Enabled = true;
}
}
private void SerialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
try
{
//因为要访问UI资源，所以需要使用invoke方式同步ui
this.Invoke((EventHandler)(delegate
{
textBox_receive.AppendText(serialPort1.ReadExisting());
}
)
);
}
catch (Exception ex)
{
//响铃并显示异常给用户
System.Media.SystemSounds.Beep.Play();
MessageBox.Show(ex.Message);
}
}
}
}
可以发送数据至数显表，但是不能接收，无报错
尝试过不使用DataReceived，用timer加readline()，但是还是没有显示数据
希望能帮我找到问题，能够接收数据。
1.你应该在对方接一个电脑，用串口调试助手，看你这边发送的对方接到是什么，对方发送的你接到又是什么
2.发送至数显表，是有显示了吗，显示的什么
3.你确定数显表接收到数据之后会有数据反馈吗，如果对方根本没有任何数据发给你，你当然接收不到
1.拿掉所有try，早崩溃早处理。到处try还是一样
2.拿掉所有啥invoke，处理逻辑就处理逻辑。逻辑没问题了你再做别的，想验证数据是否到达，直接写Trace.Writeline 输出的IDE里
3.拿掉
serialPort1.NewLine = "/r/n";
serialPort1.RtsEnable = true;
在试试，默认情况先看看，在处理特殊情况
4.订阅Error事件，串口也有error的，尤其是你用了RtsEnable这类的握手信号检查的，无法握手了Error事件就来了。RtsEnable你要求检查信号的，信号不符合要求了他当然的用error告诉你出错了
1、首先用串口助手之类的工具，确保PDA的串口是通畅的。
2、再用串口助手测试你的程序可以正确的发送数据。
3、程序与PDA互发数据。看是否通畅。
拿掉所有try
首先try catch 是用来捕获异常的，你的代码写的不规范。要进行断点调试，看下打开串口后能否取到数据 。其中波特率、数据位等信息要和串口调试工具保持一致。
一般一个串口只能打开一次。你要用代码调试的时候，要关闭串口调试工具
你用我的代码试试
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()
{
string[] ports = SerialPort.GetPortNames();
Array.Sort(ports);
return ports;
}
#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));
}