在Windows mobile中学习串口编程

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编制按：本文学习在Windows Mobile中学习串口编程的基本技术

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

namespace chapter8_SeriesTerminal
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //populate the combobox with available port names (not all may actually be valid)
            //such as Bluetooth etc emulated ports
            cbPort.DataSource = System.IO.Ports.SerialPort.GetPortNames();
        }

        private void mnuConnect_Click(object sender, EventArgs e)
        {
            //button functionality toggles depending on port status
            if (spPort.IsOpen)
            {
                //unhook the event handler
                spPort.DataReceived -= new System.IO.Ports.SerialDataReceivedEventHandler(spPort_DataReceived);
                //close the port
                spPort.Close();
                mnuConnect.Text = "Connect";
                btnSend.Enabled = false;
            }
            else
            {
                //reset the data textbox
                txtData.Text = "";
                //set the port settings
                spPort.PortName = cbPort.SelectedValue.ToString();
                spPort.BaudRate = int.Parse(txtBaud.Text);

                try
                {
                    //try openning the port and hook up the events
                    spPort.Open();
                    spPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(spPort_DataReceived);
                    mnuConnect.Text = "Disconnect";
                    btnSend.Enabled = true;
                }
                catch
                {
                    //an exception may happen if the port isn't actually valid
                    MessageBox.Show("Port not recognised", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
                }
               
            }
        }

        //method invoked on ui thread to append text to textbox
        void ShowNewData(string data)
        {
            txtData.Text += data;
        }
        //custom delegate to receive a single string for marshalling to the user interface thread
        private delegate void InvokerDelegate(string data);

        //event handler for serial port data received
        void spPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            this.Invoke(new InvokerDelegate(ShowNewData), new object[] { spPort.ReadExisting() });
        }

        //exit menu item - quits application (same as OK button)
        private void mnuExit_Click(object sender, EventArgs e)
        {
            this.Close();
            //功能和Application.exit()相同
        }

        //send an outgoing message to the remote device (appends a linebreak)
        private void btnSend_Click(object sender, EventArgs e)
        {
            if (spPort.IsOpen)
            {
                if (txtOutgoing.Text.Length > 0)
                {
                    spPort.WriteLine(txtOutgoing.Text);
                }
            }
        }

        private void Form1_HelpRequested(object sender, HelpEventArgs hlpevent)
        {
            Help.ShowHelp(this, "terminal.htm#Main_Contents");
        }
    }
}