//***********在.NET中,如何利用POP3获取邮箱中未读邮件数量**********************//

Question

这要找邮箱之类的服务器控件了吧就跟AJAX在线聊天差不多吧，期待有高手编写出来

Answer 1

想请教可否用POP3解决此问题?

Answer 2

有兄弟用POP3解决过类似问题吗?

Answer 3

什么意思？
你想写个程序，然后在程序中输入email和密码，点击，显示该邮箱内未读的邮件数？这个样子？

Answer 4

需要用到socket类和pop3协议，具体的查一下资料吧。

Answer 5

.net framework本身并未提供对pop3的支持，你可以搜索一下pop3client，它提供了基本的pop3的支持

Answer 6

使用Freepops可以完成该功能，因为其是完全通过访问网页实现邮件收发的，不过该软件需要针对不同的客户端编写插件，比较麻烦！

Answer 7

之前一直在用pop3
我也没有办法取得没读的邮件,不懂楼主找到方法了吗?找到的话和我说下!谢谢!

Answer 8

Jmail有个Method,GetMessageUID(i), 是取得邮件唯一标识的. 
收到邮件后,将这个标识保存到本地, 下次收邮件时, 先取邮件标识, 
判断本地没有该邮件后再收取即可.

Answer 9

另一种方法c#通过IMAP协议获取未读邮件数量
http://www.cnblogs.com/huazai/archive/2008/09/22/1296188.html

Answer 10

using System.Net;
using System.Net.Sockets;
using System.Net.Security;
using System.IO;
using System.Text.RegularExpressions;
using System.Security.Cryptography.X509Certificates; 申明对象:
 public TcpClient tc;
        public NetworkStream ns;
        public StreamReader sr;
        public SslStream ss;
        public static int count;
        public int port=110;
        public string server;   //与服务器建立连接
        public TcpClient GetClient()
        {
            try 
            {
                string user = Txtuser.Text;
                server = "pop." + user.Substring(user.IndexOf('@') + 1);
                if (user.IndexOf("@gpres") != -1 || user.IndexOf("@gmail") != -1)
                {
                    port = 995;
                    server = "pop.gmail.com";                }
                else
                {
                    port = 110;
                }
                tc = new TcpClient(server, port);
                return tc;
            }
            catch(Exception ex)
            {
                return null;
            }
        }        //断开与服务器的连接(110端口)
        private void Disconnect110()
        {
            //"quit"  即表示断开连接
            string input = "quit" + "\r\n";
            Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ns.Write(outbytes, 0, outbytes.Length);
            //关闭数据流
            ns.Close();
        }        //断开与服务器的连接(995端口)
        private void Disconnect995()
        {
            //"quit"  即表示断开连接
            string input = "quit" + "\r\n";
            Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ss.Write(outbytes, 0, outbytes.Length);
            //关闭数据流
            ns.Close();
        }     //关闭连接
        private void Disconnect()
        {
            if(port==110)
            {
                this.Disconnect110();
            }
            else
            {
                this.Disconnect995();
            }
        }  //110端口登陆
        public bool Login110()
        {
            try 
            {
                string user = Txtuser.Text;//用户名
                string pwd = Txtpwd.Text;//密码
                TcpClient tcp = this.GetClient();
                ns = tcp.GetStream();//获得连接对象
                sr = new StreamReader(ns);
                sr.ReadLine();
                Byte[] outbytes;
                string input;
                string readuser = string.Empty;
                string readpwd = string.Empty;
                string readsize = string.Empty;
                input = "user " + user + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ns.Write(outbytes, 0, outbytes.Length);
                readuser = sr.ReadLine();
                input = "pass " + pwd + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ns.Write(outbytes, 0, outbytes.Length);
                readpwd = sr.ReadLine();
                //登陆
                if (readpwd.IndexOf("-ERR") != -1)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            catch(Exception ex)
            {
                return false;
            }
            
        }

Answer 11

接上面
        //995端口登陆(ssl验证)
        public bool Login995()
        {
            string user = Txtuser.Text;//用户名
            string pwd = Txtpwd.Text;//密码            TcpClient tcp = this.GetClient();
            RemoteCertificateValidationCallback callback = new RemoteCertificateValidationCallback(OnCertificateValidation);
            tcp.ReceiveBufferSize = 1024;
            tcp.SendBufferSize = 1024;
            ss = new SslStream(tcp.GetStream(), false, callback);
            ss.AuthenticateAsClient(server);
            if (ss.IsAuthenticated == true)
            {
                sr = new StreamReader(ss);
                sr.ReadLine();
                Byte[] outbytes;
                string input;
                string readuser = string.Empty;
                string readpwd = string.Empty;
                input = "user " + user + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ss.Write(outbytes, 0, outbytes.Length);
                readuser = sr.ReadLine();
                input = "pass " + pwd + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ss.Write(outbytes, 0, outbytes.Length);
                readpwd = sr.ReadLine();
                //登陆
                if (readpwd.IndexOf("-ERR") != -1)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            else
            {
                return false;
            }
 
        }        //登陆服务器
        public bool GetLogin()
        {
                if (port ==110)
                {
                  return  this.Login110();
                }
                else
                {
                    return this.Login995();
                }
        }        //获得邮件的数目(110端口)
        public int GetMialCount110()
        {
            Byte[] outbytes;
            string input;
            int MialCount=0;
            input = "stat" + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ns.Write(outbytes, 0, outbytes.Length);
            string readsize = sr.ReadLine();            if (readsize.Substring(0, 4) != "-ERR")
            {
                string[] Array = readsize.Split(' ');
                MialCount = int.Parse(Array[1]);            }
            else
            {
                MialCount=0;
            }            return MialCount;
        }        //获得邮件的数目(995端口)
        public int GetMialCount995()
        {
            Byte[] outbytes;
            string input;
            int MialCount = 0;
            input = "stat" + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ss.Write(outbytes, 0, outbytes.Length);
            string readsize = sr.ReadLine();            if (readsize.Substring(0, 4) != "-ERR")
            {
                string[] Array = readsize.Split(' ');
                MialCount = int.Parse(Array[1]);            }
            else
            {
                MialCount = 0;
            }            return MialCount;
        }        public int GetMialCount()
        {
            int count;
            if(port==110)
            {
               count= this.GetMialCount110();
            }
            else
            {
                count = this.GetMialCount995();
            }            return count;
        }
登陆调用的方法:
      protected void BtnSubmit_Click(object sender, EventArgs e)
        {
            if (this.GetClient() != null)
            {
                if(this.GetLogin()==true)
                {
                    int count = this.GetMialCount();
                     Response.Write("您有:"+count +"封未读邮件");
                  /*  if (count > 0)
                    {                        this.GetNewMail();
                    }
                    else
                    {
                        Response.Write("收件箱有：0个邮件");
                    }*/
                   // Response.Write("登陆成功!");
                }
                else
                {
                    Response.Write("用户名或者密码错误");
                }
            }
            else
            {
                Response.Write("连接失败");
            }        }

Answer 12

不好意思还有这个方法
  private static bool OnCertificateValidation(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            if (sslPolicyErrors == SslPolicyErrors.None)
            {
                return true;
            }
            return false;
        }    //断开与服务器的连接(110端口)
        private void Disconnect110()
        {
            //"quit"  即表示断开连接
            string input = "quit" + "\r\n";
            Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ns.Write(outbytes, 0, outbytes.Length);
            //关闭数据流
            ns.Close();
        }        //断开与服务器的连接(995端口)
        private void Disconnect995()
        {
            //"quit"  即表示断开连接
            string input = "quit" + "\r\n";
            Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ss.Write(outbytes, 0, outbytes.Length);
            //关闭数据流
            ns.Close();
        }

Answer 13

readsize.Substring(0, 4) != "-ERR"楼上的为什么这么写，这是在判断什么

Answer 14

POP3根本就没有这样的功能。对于POP3来说，邮件不分已读未读，你只能下载邮件。就好像HTTP一样，不能判断某某文章你是否读过，读过就不下载。你要有已读未读的区分，必须用IMAP，但国内大多数邮箱都不支持IMAP，你就只能通过HTTP爬虫去抓取分析了。

Answer 15

 imap我也试过，可是它返回的是邮箱的邮件总数，可是未读邮件还在研究

Answer 16

大家，如果用web网页形式抓取的话是可以区分的，每个邮件都有一个唯一的messageId,可以把这个保存到数据库中，然后下次抓取的时候可以比较，然后从数据库中取邮件显示出来。
但是抓取我有一个搞不掂的难题就是怎么样才不会重复抓取全部，也就是说怎么设置在上次抓取的时间之后去抓取