Csharp/C Sharp/Network/Mail

A POP3 e-mail checker

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Drawing; using System.IO; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Windows.Forms; public class PopCheck : Form {

  private TextBox hostname;
  private TextBox username;
  private TextBox password;
  private TextBox status;
  private ListBox messages;
  private TcpClient mailclient;
  private NetworkStream ns;
  private StreamReader sr;
  private StreamWriter sw;
  public PopCheck()
  {
     Text = "popcheck - A POP3 e-mail checker";
     Size = new Size(400, 380);
     Label label1 = new Label();
     label1.Parent = this;
     label1.Text = "Hostname:";
     label1.AutoSize = true;
     label1.Location = new Point(10, 33);
     hostname = new TextBox();
     hostname.Parent = this;
     hostname.Size = new Size(200, 2 * Font.Height);
     hostname.Location = new Point(75, 30);
     Label label2 = new Label();
     label2.Parent = this;
     label2.Text = "User name:";
     label2.AutoSize = true;
     label2.Location = new Point(10, 53);
     username = new TextBox();
     username.Parent = this;
     username.Size = new Size(200, 2 * Font.Height);
     username.Location = new Point(75, 50);
     Label label3 = new Label();
     label3.Parent = this;
     label3.Text = "Password:";
     label3.AutoSize = true;
     label3.Location = new Point(10, 73);
     password = new TextBox();
     password.Parent = this;
     password.PasswordChar = "*";
     password.Size = new Size(200, 2 * Font.Height);
     password.Location = new Point(75, 70);
     Label label4 = new Label();
     label4.Parent = this;
     label4.Text = "Status:";
     label4.AutoSize = true;
     label4.Location = new Point(10, 325);
    
     status = new TextBox();
     status.Parent = this;
     status.Text = "Not connected";
     status.Size = new Size(200, 2 * Font.Height);
     status.Location = new Point(50, 322);
     messages = new ListBox();
     messages.Parent = this;
     messages.Location = new Point(10, 108);
     messages.Size = new Size(360, 16 * Font.Height);
     messages.DoubleClick += new EventHandler(getmessagesDoubleClick);
     Button login = new Button();
     login.Parent = this;
     login.Text = "Login";
     login.Location = new Point(295, 32);
     login.Size = new Size(5 * Font.Height, 2 * Font.Height);
     login.Click += new EventHandler(ButtonloginOnClick);
     Button close = new Button();
     close.Parent = this;
     close.Text = "Close";
     close.Location = new Point(295, 62);
     close.Size = new Size(5 * Font.Height, 2 * Font.Height);
     close.Click += new EventHandler(ButtoncloseOnClick);
   }
  void ButtonloginOnClick(object obj, EventArgs ea)
  {
     status.Text = "Checking for messages...";
     Thread startlogin = new Thread(new ThreadStart(loginandretr));
     startlogin.IsBackground = true;
     startlogin.Start();
  }
  void ButtoncloseOnClick(object obj, EventArgs ea)
  {
     if (ns != null)
     {
        sw.Close();
        sr.Close();
        ns.Close();
        mailclient.Close();
     }
     Close();
  }
  void loginandretr()
  {
     string response;
     string from = null;
     string subject = null;
     int totmessages;
     try
     {
        mailclient = new TcpClient(hostname.Text, 110);
     } catch (SocketException)
     {
        status.Text = "Unable to connect to server";
        return;
     }
     ns = mailclient.GetStream();
     sr = new StreamReader(ns);
     sw = new StreamWriter(ns);
     response = sr.ReadLine(); //Get opening POP3 banner
     sw.WriteLine("User " + username.Text); //Send username
     sw.Flush();
     response = sr.ReadLine();
     if (response.Substring(0,4) == "-ERR")
     {
        status.Text = "Unable to log into server";
        return;
     }
     sw.WriteLine("Pass " + password.Text);  //Send password
     sw.Flush();
     try
     {
        response = sr.ReadLine();
     } catch (IOException)
     {
        status.Text = "Unable to log into server";
        return;
     }
     if (response.Substring(0,3) == "-ER")
     {
        status.Text = "Unable to log into server";
        return;
     }
     sw.WriteLine("stat"); //Send stat command to get number of messages
     sw.Flush();
     response = sr.ReadLine();
     string[] nummess = response.Split(" ");
     totmessages = Convert.ToInt16(nummess[1]);
     if (totmessages > 0)
     {
        status.Text = "you have " + totmessages + " messages";
     } else
     {
        status.Text = "You have no messages" ;
     }
     for (int i = 1; i <= totmessages; i++)
     {
        sw.WriteLine("top " + i + " 0"); //read header of each message
        sw.Flush();
        response = sr.ReadLine();
        while (true)
        {
           response = sr.ReadLine();
           if (response == ".")
              break;
           if (response.Length > 4)
           {
              if (response.Substring(0, 5) == "From:")
                 from = response;
              if (response.Substring(0, 8) == "Subject:")
                 subject = response;
           }
        }
        messages.Items.Add(i + "  " + from + "  " + subject);
     }
  }
  void getmessagesDoubleClick(object obj, EventArgs ea)
  {
     string text = (string)messages.SelectedItem;
     string[] textarray = text.Split(" ");
     ShowMessage sm = new ShowMessage(ns, textarray[0]);
     sm.ShowDialog();
  }
  public static void Main()
  {
     Application.Run(new PopCheck());
  }

} class ShowMessage : Form {

  public ShowMessage(NetworkStream ns, string messnumber)
  {
     StreamReader sr = new StreamReader(ns);
     StreamWriter sw = new StreamWriter(ns);
     string response;
     Text = "Message " + messnumber;
     Size = new Size(400, 380);
     ShowInTaskbar = false;
     TextBox display = new TextBox();
     display.Parent = this;
     display.Multiline = true;
     display.Dock = DockStyle.Fill;
     display.ScrollBars = ScrollBars.Both;
     sw.WriteLine("retr " + messnumber); //Retrieve entire message
     sw.Flush();
     response = sr.ReadLine();
     while (true)
     {
        response = sr.ReadLine();
        if (response == ".")
           break;
        display.Text += response + "\r\n";
     }
  }

}

      </source>

Fancy Mail Test

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Web.Mail; public class FancyMailTest {

  public static void Main()
  {
     MailMessage mm = new MailMessage();
     mm.From = "haley@myisp.net";
     mm.To = "riley@yourisp.net;rich@shadrach.ispnet1.net";
     mm.Cc = "matthew@anotherisp.net;chris@hisisp.net";
     mm.Bcc = "katie@herisp.net;jessica@herisp.net";
     mm.Subject = "This is a fancy test message";
     mm.Headers.Add("Reply-To", "haley@myisp.net");
     mm.Headers.Add("Comments", "This is a test HTML message");
     mm.Priority = MailPriority.High;
     mm.BodyFormat = MailFormat.Html;

mm.Body = "<html><body>

This is a test message

This message should have HTML-type formatting

Please use an HTML-capable viewer.";

     try
     {
        SmtpMail.Send(mm);
     } catch (System.Web.HttpException)
     {
        Console.WriteLine("This device is unable to send Internet messages");
     }
  }

}

      </source>

Mail Attach Test

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Web.Mail; public class MailAttachTest {

  public static void Main()
  {
     MailAttachment myattach =
         new MailAttachment("c:\\temp\\MailAttachTest.exe", MailEncoding.Base64);
     MailMessage newmessage = new MailMessage();
     newmessage.From = "barbara@shadrach.ispnet1.net";
     newmessage.To = "rich@shadrach.ispnet1.net";
     newmessage.Subject = "A test mail attachment message";
     newmessage.Priority = MailPriority.High;
     newmessage.Headers.Add("Comments",
                "This message attempts to send a binary attachment");
     newmessage.Attachments.Add(myattach);
     newmessage.Body = "Here"s a test file for you to try";
     try
     {
        SmtpMail.SmtpServer = "192.168.1.100";
        SmtpMail.Send(newmessage);
     } catch (System.Web.HttpException)
     {
        Console.WriteLine("This device can not send Internet messages");
     }
  }

}

      </source>

Mail Test

<source lang="csharp"> using System; using System.Net; using System.Web.Mail; public class MailTest {

  public static void Main()
  {
     string from = "from@from.net";
     string to = "to@to.net";
     string subject = "This is a test mail message";
     string body = "Hi .";
     SmtpMail.SmtpServer = "192.168.1.150";
     SmtpMail.Send(from, to, subject, body);
  }

}

      </source>

SmtpClient: From, Subject, Body, Attachments, To

<source lang="csharp"> using System; using System.Net; using System.Net.Mail; class MainClass {

   public static void Main(string[] args) {
       SmtpClient client = new SmtpClient("mail.somecompany.ru", 25);
       client.Credentials = new NetworkCredential("user@somecompany.ru", "password");
       using (MailMessage msg = new MailMessage()) {
           msg.From = new MailAddress("author@visual-csharp-recipes.ru");
           msg.Subject = "Greetings";
           msg.Body = "This is a  message.";
           msg.Attachments.Add(new Attachment("7.cs", "text/plain"));
           msg.Attachments.Add(new Attachment("7.exe", "application/octet-stream"));
           foreach (string str in args) {
               try {
                   msg.To.Add(new MailAddress(str));
               } catch (FormatException ex) {
                   Console.WriteLine("{0}: Error -- {1}", str, ex.Message);
                   continue;
               }
           }
           client.Send(msg);
       }
   }

}

</source>