using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.Threading;

namespace SYGSM
{
    class GsmClass
    {
        /// <summary>
        /// GetMessage函数用于读取SIM卡中的短信
        /// </summary>
        /// <param name="wz">短信位置</param>
        public static string[] GetMessage(string comn,int wz,bool delyn)
        {
            //定义短信端口操作类
            SerialPort serialPort = new SerialPort("COM" + comn.ToString(), 9600, Parity.None, 8, StopBits.One);
            serialPort.WriteTimeout = 2000;

            try
            {
                //设置读缓冲区大小
                serialPort.ReadBufferSize = 900000;
                if (serialPort.IsOpen == false)
                    serialPort.Open();

                //向串口发出命令，清空以前的操作
                serialPort.WriteLine("ATZ/r");
                //延时1秒等待，串口操作完成
                Thread.Sleep(1000);
                //发出读取指定位置的短信的命令
                serialPort.ReadExisting();
                serialPort.WriteLine("AT+CMGR=" + wz.ToString() + "/r");
                //延时1秒等待，串口操作完成
                Thread.Sleep(2000);
                //取得返回值（包含短信内容的字符串）
                string x3 = serialPort.ReadExisting();

                //向串口发出命令，删除已经被读取的短信
                if (delyn)
                {
                    //延时2秒等待，串口操作完成
                    Thread.Sleep(200);
                    serialPort.WriteLine("AT+CMGD=" + wz.ToString() + "/r/n");
                }
                Thread.Sleep(200);
                //关闭端口
                serialPort.Close();

                //分析字符串，得到短信内容中的需要的数据
                string[] tmps = x3.Split('/n');
                string mess = "";
                for (int j = 3; j < tmps.Length -3 ; j++)
                {
                    mess +=(mess==""?"":"/n/r")+tmps[j];
                }

                 //tmps[2]短信信息
                tmps[2] = tmps[2].Substring(tmps[2].IndexOf(':') + 1).Trim();
                string[] dxxxlist = GetSplitEx(tmps[2], ',', '"');
                if (dxxxlist.Length < 4) return new string[3] { "", "", "" };

                List<string> ls = new List<string>();
                ls.Add(dxxxlist[1]);
                ls.Add(dxxxlist[3]);
                ls.Add(mess);
                return ls.ToArray();
            }
            catch (Exception e1)
            {
                Console.WriteLine(e1.Message);
                return new string[3]{"","",""};
            }
            finally
            {
                //保证操作完成以后关闭端口，避免占用
                if (serialPort.IsOpen)
                    serialPort.Close();
            }
        }

        public static string[] GetSplitEx(string str,char splitchar,char signchar)
        {
            List<string> ls = new List<string>();

            if (str==null||str.Length==0) return new string[1]{""};

            while (true)
            {
                int startwz = 0; //开始找找分隔符位置
                bool splityn = false;//是否找到分隔符
                bool signyn = false; //是否以格式符开始
                int wz = 0;//分隔符位置
                string dxxx = "";//本次内容

                signyn = (str.IndexOf(signchar)==0);//是否以格式符开始
                startwz = (signyn ? (str.IndexOf(signchar, 1) < 0 ? 0 : str.IndexOf(signchar, 1)) : 0);
                splityn = (str.IndexOf(splitchar, startwz) >= 0);
                wz = (splityn?str.IndexOf(splitchar, startwz):str.Length);
                dxxx = str.Substring(0, wz);
                ls.Add(((signyn && dxxx[dxxx.Length - 1] == signchar) ? dxxx.Substring(1, dxxx.Length - 2) : dxxx));
                //Console.WriteLine(ls[ls.Count - 1]);
                if (!splityn) break;
                str = str.Substring(wz + 1);
            }
            return ls.ToArray();
        }

        static void Main(string[] args)
        {
            //

            string[] mess = GsmClass.GetMessage("3", 1, false);
            Console.WriteLine("发 送 者：" + mess[0]);
            Console.WriteLine("发送时间：" + mess[1]);
            Console.WriteLine("短信内容：" + mess[2]);
            Console.ReadLine();
        }
    }
}