Retrieve Email with Event Handler in C#

In previous section, I introduced how to retrieve email from Hotmail/MSN Live account. In this section, I will introduce how to retrieve email with event handler in C#.

Introduction

After Connect method, GetMail method or other methods are invoked, if you want to know the progress of the email receiving, you should use Event Handler. The following sample codes demonstrate how to use Event Handler to monitor the progress of email receiving.

Note

Remarks: All of examples in this section are based on first section: A simple C# project. To compile and run the following example codes successfully, please click here to learn how to create the test project and add reference to your project.

[C# Example - Retrieve email with event handler]

The following example codes demonstrate how to use EAGetMail POP3 component to retrieve email with event handler. In order to run it correctly, please change email server, user, password, folder, file name values.

Note

To get the full sample projects, please refer to Samples section.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using EAGetMail; //add EAGetMail namespace

namespace receiveemail
{
    class Program
    {
        private static void OnConnected(object sender, ref bool cancel)
        {
            Console.WriteLine("Connected");
        }

        private static void OnQuit(object sender, ref bool cancel)
        {
            Console.WriteLine( "Quit");
        }

        private static void OnReceivingDataStream(object sender,
             MailInfo info, int received, int total, ref bool cancel)
        {
            Console.WriteLine(String.Format("Receiving {0}, {1}/{2}...", info.Index,
                received, total));
        }

        private static void OnIdle(object sender, ref bool cancel)
        {

        }

        private static void OnAuthorized(object sender, ref bool cancel)
        {
            Console.WriteLine("Authorized");

        }

        private static void OnSecuring(object sender, ref bool cancel)
        {
            Console.WriteLine("Securing");
        }

        static void Main(string[] args)
        {
            // Create a folder named "inbox" under current directory
            // to save the email retrieved.
            string curpath = Directory.GetCurrentDirectory();
            string mailbox = String.Format("{0}\\inbox", curpath);

            // If the folder is not existed, create it.
            if (!Directory.Exists(mailbox))
            {
                Directory.CreateDirectory(mailbox);
            }

            MailServer oServer = new MailServer("pop3.emailarchitect.net",
                        "test@emailarchitect.net", "testpassword", ServerProtocol.Pop3 );
            MailClient oClient = new MailClient("TryIt");

            // If your POP3 server requires SSL connection,
            // Please add the following codes:
            // oServer.SSLConnection = true;
            // oServer.Port = 995;

            // Catching the following events is not necessary,
            // just make the application more user friendly.
            // If you use the object in asp.net/windows service or non-gui application,
            // You need not to catch the following events.
            oClient.OnAuthorized += new MailClient.OnAuthorizedEventHandler( OnAuthorized );
            oClient.OnConnected += new MailClient.OnConnectedEventHandler( OnConnected );
            oClient.OnIdle += new MailClient.OnIdleEventHandler( OnIdle );
            oClient.OnSecuring += new MailClient.OnSecuringEventHandler( OnSecuring );
            oClient.OnReceivingDataStream +=
                new MailClient.OnReceivingDataStreamEventHandler( OnReceivingDataStream );

            try
            {
                oClient.Connect(oServer);
                MailInfo[] infos = oClient.GetMailInfos();
                for (int i = 0; i < infos.Length; i++)
                {
                    MailInfo info = infos[i];
                    Console.WriteLine("Index: {0}; Size: {1}; UIDL: {2}",
                        info.Index, info.Size, info.UIDL);

                    // Receive email from POP3 server
                    Mail oMail = oClient.GetMail(info);

                    Console.WriteLine("From: {0}", oMail.From.ToString());
                    Console.WriteLine("Subject: {0}\r\n", oMail.Subject);

                    // Generate an email file name based on date time.
                    System.DateTime d = System.DateTime.Now;
                    System.Globalization.CultureInfo cur = new
                        System.Globalization.CultureInfo("en-US");
                    string sdate = d.ToString("yyyyMMddHHmmss", cur);
                    string fileName = String.Format("{0}\\{1}{2}{3}.eml",
                        mailbox, sdate, d.Millisecond.ToString("d3"), i);

                    // Save email to local disk
                    oMail.SaveAs(fileName, true);

                    // Mark email as deleted from POP3 server.
                    oClient.Delete(info);
                }

                // Quit and purge emails marked as deleted from POP3 server.
                oClient.Quit();
            }
            catch (Exception ep)
            {
                Console.WriteLine(ep.Message);
            }

        }
    }
}

Next Section

At next section I will introduce how to use UIDL function to mark the email has been downloaded.

Appendix

Comments

If you have any comments or questions about above example codes, please click here to add your comments.