大智(若愚)

Pop3認證程式碼...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.IO;
namespace pop3
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpClient tcpc = new TcpClient("pop3Server", 110);
            string user, pass;
            user = Console.ReadLine();
            pass = Console.ReadLine();
            Pop3(tcpc,user,pass);
            Console.ReadKey();
        }
        static void Pop3(TcpClient tcpc ,string user,string pass)
        {
            string strRet;
            NetworkStream st = tcpc.GetStream();
            StreamReader sr = new StreamReader(st);
            //Console.WriteLine(sr.ReadLine());
            strRet = sr.ReadLine();
            if (Check(strRet))
            {
                Console.WriteLine("連線成功!!!!");
            }
            else
            {
                Console.WriteLine("連線失敗!!");
            }

            string input;
            input ="user "+ user+"\r\n";
            Byte[] output = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            st.Write(output, 0, output.Length);
            //Console.WriteLine(sr.ReadLine());
            strRet = sr.ReadLine();//這行拿掉怎麼試都不行永遠都是登入成功XD!可以跟我講是為什麼＠＠

         
            input = "pass " + pass + "\r\n";
             output = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            st.Write(output, 0, output.Length);
            strRet = sr.ReadLine();
            if (Check(strRet))
            {
                Console.WriteLine("登入成功");
            }
            else
            {
                Console.WriteLine("登入失敗");
            }
            
            
        }
        static bool Check(string strRet)//判斷是否正確
        {
            if (strRet.Substring(0,3) == "+OK")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}

原始碼：pop3.rar

自己嘗試的~請多多指教:D

我只是個小小的入門者