form1.cs

一个国外的编程人员用C#编的串口通信程序

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


namespace RS232
{
    public partial class fclsRS232Tester : Form
    {
        string InputData = String.Empty;
        SerialPort port = new SerialPort();
        // This delegate enables asynchronous calls for setting
        // the text property on a TextBox control:
        delegate void SetTextCallback(string text);
 
        public fclsRS232Tester()
        {
            InitializeComponent();

            // Nice methods to browse all available ports:
            string[] ports = SerialPort.GetPortNames();

            // Add all port names to the combo box:
            foreach (string port in ports)
            {
                cmbComSelect.Items.Add(port);
            }
            //SerialPort port = new SerialPort();
        }

        private void cmbComSelect_SelectionChangeCommitted(object sender, EventArgs e)
        {
            if (port.IsOpen) port.Close();
            port.PortName = cmbComSelect.SelectedItem.ToString();
            stsStatus.Text = port.PortName + ": 9600,8N1";

            // try to open the selected port:
            try
            {
                port.Open();
            }
            // give a message, if the port is not available:
            catch
            {
                MessageBox.Show("Serial port " + port.PortName + " cannot be opened!", "RS232 tester", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                cmbComSelect.SelectedText = "";
                stsStatus.Text = "Select serial port!";
            }
            port.DataReceived += new SerialDataReceivedEventHandler(datarev);
        }
        #region //接收来自串口的数据
        void datarev(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            InputData = port.ReadExisting();
            if (InputData != String.Empty)
            {
                SetText(InputData);
            }
        }
        #endregion
        private void btnSend_Click(object sender, EventArgs e)
        {
            if (port.IsOpen) port.WriteLine(txtOut.Text);
            else MessageBox.Show("Serial port is closed!", "RS232 tester", MessageBoxButtons.OK, MessageBoxIcon.Error);
            txtOut.Clear();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            txtIn.Clear();
        }

     

    
       
        private void SetText(string text)
        {
            // InvokeRequired required compares the thread ID of the
            // calling thread to the thread ID of the creating thread.
            // If these threads are different, it returns true.
            if (this.txtIn.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else this.txtIn.Text += text;
        }

        private void fclsRS232Tester_Load(object sender, EventArgs e)
        {
            //port1.PortName = cmbComSelect.SelectedItem.ToString();
            //this.Port1.PortName = "Com2";
        }

        private void Port1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            InputData = port.ReadExisting();
            if (InputData != String.Empty)
            {
                SetText(InputData);
            }

        }

    }
}