串行通信程序（C#）

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本程序采用的是DataReceived方法

1 发送字节

字节的转换

bySend[0] =Byte.Parse(textBox1.Text,System.Globalization.NumberStyles.HexNumber);
发送字节

clsComPort.Write(bySend, 0, 1);

2 接收字节

接收事件初始化

clsComPort.DataReceived += newSerialDataReceivedEventHandler(OnDataReceived);

clsComPort.ReceivedBytesThreshold = 1;//门槛是1个字节

该过程中包含步骤：

I 定义委托

II 声明实例

III 传递处理程序句柄参数给委托

源代码如下：

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 Microsoft.VisualBasic;

namespace serialport_CSharp
{
    publicpartial class Form1 : Form
   {
         SerialPort clsComPort = newSerialPort("COM1",9600,Parity.None,8,StopBits.One);

         delegate void dgtSerialPort(byte byString);//定义委托
         dgtSerialPort clsInterfaceSerialportHandle;//定义类

         byte[] byByteReceive = new byte[1];

         public bool bComIsOpen;
         public Form1()
         {
             InitializeComponent();

}

       private void Form1_Load(object sender, EventArgs e)
       {
           //init ComSelected
           int i;
           for (i = 1; i <= 16;i++ )
           {
               ComSel.Items.Add("COM" + i);
           }
           ComSel.SelectedIndex = 0;

           //init serialport
           clsComPort.Close();
           clsComPort.ReceivedBytesThreshold = 1;//门槛是1个字节
           clsInterfaceSerialportHandle = new dgtSerialPort(UpdateText);
           clsComPort.DataReceived += newSerialDataReceivedEventHandler(OnDataReceived);

           //init variable
           bComIsOpen = false;

       }

       private void btnOpenCloseCmd_Click(object sender, EventArgse)
       {
           try
           {
               if (!bComIsOpen)   //comport isclose
               {
                   clsComPort.PortName = ComSel.SelectedItem.ToString();
                   clsComPort.Open();
                   btnComOpenCloseCmd.Text = "关闭串口";
                   bComIsOpen = true;

               }
               else
               {
                   clsComPort.Close();
                   btnComOpenCloseCmd.Text = "打开串口";
                   bComIsOpen = false;
               }
           }
           catch
           {
               MessageBox.Show("串口无效","串行通信",MessageBoxButtons.OK,MessageBoxIcon.Error);

           }
       }

       private void btnSendCmd_Click(object sender, EventArgs e)
       {
           if (!bComIsOpen)
           {
               MessageBox.Show("请打开串口！", "串口通信", MessageBoxButtons.OK,MessageBoxIcon.Error);
           }
           else
           {
               if (textBox1.Text=="")
               {
                   MessageBox.Show("请输入字符！", "串口通信", MessageBoxButtons.OK,MessageBoxIcon.Error);
               }
               else
               {
                   Byte[] bySend=new byte[1];

bySend[0] = Byte.Parse(textBox1.Text,System.Globalization.NumberStyles.HexNumber);
clsComPort.Write(bySend, 0, 1);

               }
           }
       }
       void OnDataReceived(object sender,SerialDataReceivedEventArgse)
       {

               clsComPort.Read(byByteReceive, 0, 1);
               this.Invoke(clsInterfaceSerialportHandle, byByteReceive[0]);

       }
       void UpdateText(byte bystr)
       {
           textBox2.Text = Conversion.Hex(bystr);
       }

}
}