form1.cs

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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.Net;
using System.Net.Sockets;
using System.IO;

namespace wang
{
    public partial class Form1 : Form
    {
        private TcpClient myClient;
        private NetworkStream ns;
        private StreamReader sr;
        private StreamWriter sw;
        private string result;
        public Form1()
        {
            InitializeComponent();
        }
        private void onretry()
        {
            
        }
        private void ConnectToServer()
        {
            myClient = new TcpClient();
            try
            {
                myClient.Connect(this.textBox1.Text, 110);
                
                MessageBox.Show("连接服务器成功","!");
                //初始化网络流,数据就是通过这个对象读出来的
                
                ns = myClient.GetStream();
                sr = new StreamReader(ns);
                sw = new StreamWriter(ns);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        private void LogonServer()
        {
            result = sr.ReadLine();
            MessageBox.Show(result);
            sw.WriteLine("USER " + this.textBox2.Text);
            sw.Flush();

            result = sr.ReadLine();
            if (result.Substring(0, 3) == "-ER")
            {
                MessageBox.Show("没有这个用户名");
                return;
            }

            sw.WriteLine("PASS " + this.textBox3.Text);
            sw.Flush();

            try
            {
                result = sr.ReadLine();
            }
            catch (IOException ioex)
            {
                MessageBox.Show(ioex.Message);
                return;
            }

            if (result.Substring(0, 4) == "-ERR")
            {
                MessageBox.Show("无法登录,可能使用户名密码错误!");
                return;
            }

            MessageBox.Show("登录成功");

        }

        //获取邮件列表
        private void GetEmailList()
        {
            string from = null;
            string subject = null;
            sw.WriteLine("stat");
            sw.Flush();

            result = sr.ReadLine();
            // MessageBox.Show(result);
            string[] nummessage = result.Split(' ');
            int totalnum = Convert.ToInt32(nummessage[1]);
            if (totalnum > 0)
                MessageBox.Show("你有" + totalnum.ToString() + "邮件");
            else
                MessageBox.Show("邮箱里没有邮件");

            for (int i = 1; i <= totalnum; i++)
            {
                sw.WriteLine("top " + i.ToString() + " 0");
                sw.Flush();
                result = sr.ReadLine();

                while (true)
                {
                    result = sr.ReadLine();
                    if (result == ".")
                        break;
                    if (result.Length > 4)
                    {
                        if (result.Substring(0, 5) == "From:")
                            from = result;
                        if (result.Substring(0, 8) == "Subject:")
                            subject = result;

                    }
                }
                this.textBox5.Text += i.ToString() + " " + from + " " + subject+"\r\n";
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            
            ConnectToServer();
            LogonServer();
            GetEmailList();
        }
    }
}