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   源码介绍

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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;
using System.Threading;
using Microsoft.Win32;

namespace TEXTCOM
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private SerialPort Sp = new SerialPort();
        public delegate void HandleInterfaceUpdataDelegate(string text); //委托，此为重点 
        private HandleInterfaceUpdataDelegate interfaceUpdataHandle;

        private bool qiii = false;


     

     


        public void Sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            string strTemp = "";
            double iSecond = 0.5;

            DateTime dtOld = System.DateTime.Now;
            DateTime dtNow = System.DateTime.Now;
            TimeSpan dtInter;
            dtInter = dtNow - dtOld;

            int i = Sp.BytesToRead;
            if (i > 0)
            {
                try
                {
                    strTemp = Sp.ReadExisting();
                }
                catch
                { }
                if (strTemp.ToLower().IndexOf("\r") < 0)
                {
                    i = 0;
                }
                else
                {
                    this.Invoke(interfaceUpdataHandle, strTemp);
                }
            }
            while (dtInter.TotalSeconds < iSecond && i <= 0)
            {
                dtNow = System.DateTime.Now;
                dtInter = dtNow - dtOld;
                i = Sp.BytesToRead;
                if (i > 0)
                {
                    try
                    {
                        strTemp  = Sp.ReadExisting();
                    }
                    catch
                    { }
                    if (strTemp.ToLower().IndexOf("\r") < 0)
                    {
                        i = 0;
                    }
                    else
                    {
                        this.Invoke(interfaceUpdataHandle, strTemp);
                    }
                }
            }
            // do null  

        }

        private void UpdateTextBox(string text)
        {
            textBox2.Text = text;
        }

        /// <summary> 
        /// 执行AT指令并返回 成功失败 
        /// </summary> 
        /// <param name="ATCmd">AT指令</param> 
        /// <param name="StCmd">AT指令标准结束标识</param> 
        /// <returns></returns> 
        private void ATCommand3(string ATCmd, string StCmd)
        {
            string response = "";
            response = ATCommand(ATCmd, StCmd);


        }

        /// <summary> 
        /// 执行AT指令并返回结果字符 
        /// </summary> 
        /// <param name="ATCmd">AT指令</param> 
        /// <param name="StCmd">AT指令标准结束标识</param> 
        /// <returns></returns> 
        private string ATCommand(string ATCmd, string StCmd)
        {
            string response = "";
            int i;
            if (!ATCmd.EndsWith("\x01a"))
            {
                if (!(ATCmd.EndsWith("\r") || ATCmd.EndsWith("\r\n")))
                {
                    ATCmd = ATCmd   "\r";
                }
            }
            Sp.WriteLine(ATCmd);

            //第一次读响应数据 
            if (Sp.BytesToRead > 0)
            {
                response = Sp.ReadExisting();

                //去除前端多可能多读取的字符 
                if (response.IndexOf(ATCmd) > 0)
                {
                    response = response.Substring(response.IndexOf(ATCmd));
                }
                else
                {

                }

                if (response == "" || response.IndexOf(StCmd) < 0)
                {
                    if (response != "")
                    {
                        if (response.Trim() == "ERROR")
                        {
                            //throw vError = new UnknowException("Unknown exception in sending command:"   ATCmd); 
                        }
                        if (response.IndexOf(" CMS ERROR") >= 0)
                        {
                            string[] cols = new string[100];
                            cols = response.Split(';');
                            if (cols.Length > 1)
                            {
                                string errorCode = cols[1];
                            }
                        }
                    }
                }
            }

            //读第一次没有读完的响应数据，直到读到特征数据或超时 
            for (i = 0; i < 3; i  )
            {
                Thread.Sleep(1000);
                response = response   Sp.ReadExisting();
                if (response.IndexOf(StCmd) >= 0)
                {
                    break;
                }
            }

            return response;


        }

        /// <summary> 
        /// 从注册表获取系统串口列表 
        /// </summary> 
        private void GetComList()
        {
            RegistryKey keyCom = Registry.LocalMachine.OpenSubKey("Hardware\\DeviceMap\\SerialComm");
            if (keyCom != null)
            {
                string[] sSubKeys = keyCom.GetValueNames();
                this.comboBox1.Items.Clear();
                foreach (string sName in sSubKeys)
                {
                    string sValue = (string)keyCom.GetValue(sName);
                    this.comboBox2.Items.Add(sValue);
                }
            }
        }

        private void cmID_DropDown(object sender, EventArgs e)
        {
            GetComList();
        } 


   

        private void Form1_Load_1(object sender, EventArgs e)
        {

            GetComList();
            btPause.Enabled = false;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Sp.Close();

        }

        private void btPause_Click_1(object sender, EventArgs e)
        {
            Sp.Close();
            btENT.Enabled = true;
            btPause.Enabled = false; 

        }

        private void btEnt_Click_1(object sender, EventArgs e)
        {
            if ((this.comboBox2.Text.Trim() != "") && (this.comboBox1.Text != ""))
            {
                interfaceUpdataHandle = new HandleInterfaceUpdataDelegate(UpdateTextBox);//实例化委托对象 
                Sp.PortName = this.comboBox2.Text.Trim();
                Sp.BaudRate = Convert.ToInt32(this.comboBox1.Text.Trim());
                Sp.Parity = Parity.None;
                Sp.StopBits = StopBits.One;
                Sp.DataReceived  = new SerialDataReceivedEventHandler(Sp_DataReceived);
                Sp.ReceivedBytesThreshold = 1;
                try
                {
                    Sp.Open();

                    ATCommand3("AT CLIP=1\r", "OK");


                    btPause.Enabled = true;
                    btENT.Enabled = false;
                }
                catch
                {
                    MessageBox.Show("端口"   this.comboBox2.Text.Trim()   "打开失败！");
                }
            }
            else
            {
                MessageBox.Show("请输入正确的端口号和波特率！");
                this.comboBox2.Focus();
            }
        }
    }
}