Retrieve Email with Event Handler in C++/CLI/CLR

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++/CLI/CLR.

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++/CLI/CLR 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++/CLI/CLR 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.

#include "stdafx.h"

using namespace System;
using namespace System::IO;
using namespace EAGetMail; //add EAGetMail namespace

System::Void OnConnected(Object ^sender, System::Boolean % cancel )
{
    Console::WriteLine("Connected");
}

System::Void OnQuit(Object ^sender, System::Boolean % cancel )
{
    Console::WriteLine("Quit");
}

System::Void OnReceivingDataStream(Object ^sender, MailInfo ^info,
                int received, int total, System::Boolean % cancel )
{
    Console::WriteLine(String::Format("Receiving {0}, {1}/{2}...", info->Index,
                received, total));
}

System::Void OnIdle( Object ^sender, System::Boolean % cancel )
{
}

System::Void OnAuthorized( Object ^sender, System::Boolean % cancel )
{
    Console::WriteLine("Authorized");
}

System::Void OnSecuring( Object ^sender, System::Boolean % cancel )
{
    Console::WriteLine("Securing...");
}

int main(array<System::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 = gcnew MailServer("pop3.emailarchitect.net",
        "test@emailarchitect.net", "testpassword", ServerProtocol::Pop3 );
    MailClient ^oClient = gcnew 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.
    // To learn more detail, please refer to the code in EventHandler region
    oClient->OnAuthorized += gcnew MailClient::OnAuthorizedEventHandler( &OnAuthorized );
    oClient->OnConnected += gcnew MailClient::OnConnectedEventHandler( &OnConnected );
    oClient->OnIdle += gcnew MailClient::OnIdleEventHandler( &OnIdle );
    oClient->OnSecuring += gcnew MailClient::OnSecuringEventHandler( &OnSecuring );
    oClient->OnReceivingDataStream +=
        gcnew MailClient::OnReceivingDataStreamEventHandler( &OnReceivingDataStream );
    oClient->OnQuit += gcnew MailClient::OnQuitEventHandler( &OnQuit );

    try
    {
        oClient->Connect(oServer);
        array<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 = gcnew
                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);
    }

    return 0;
}

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.