串行端口讀取在C＃中不起作用

Question

我正在開發C＃Windows應用程序。它從稱重橋機到串行端口讀取重量。但是，我的代碼不起作用。我正在嘗試從互聯網下載的許多示例不起作用。我的代碼如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO;

namespace SerialPortTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        String a = "";

        private void button1_Click(object sender, EventArgs e)
        {
        serialPort1 = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
        if (serialPort1.IsOpen == false)
        {
            serialPort1.Open();
        }
        timer1.Start();
        button1.Enabled = false;
        button2.Enabled = true;
        }

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            a = a + serialPort1.ReadExisting();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (a.Length != 0)
            {
                textBox1.AppendText(a);
                a = "";
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen == true)
            {
                serialPort1.Close();
                button2.Enabled = false;
                button1.Enabled = true;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen == true)
            {
                button1.Enabled = false;
                button2.Enabled = true;
            }
            else
            {
                button1.Enabled = true;
                button2.Enabled = false;
            }
        }
    }
}

我在我的代碼中所犯的錯誤可以幫助任何我的工作代碼。 提前致謝。

Answer 1

您沒有為serialPort1注冊serialPort1_DataReceived。

serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);

Answer 2

您可能需要從流中提取二進制數據，而不是將數據讀取為字符串？

這是一些可能位於DataReceived事件處理程序中的代碼的示例...

int nb = serialPort1.BytesToRead;
if (nb > 0) 
{
  byte[] buffer = new byte[nb];
  serialPort1.Read(buffer, 0, nb);

  // Depending on the structure of the binary data ...
  int number1 = BitConverter.ToInt32(buffer, 0);
  int number2 = BitConverter.ToInt32(buffer, 4);
  // etc.
}