Retrieve Email from IMAP4 server in C++/CLI/CLR

In previous section, I introduced retrieving email from POP3 server in C++/CLI/CLR. In this section, I will introduce the IMAP4 server.

Introduction

IMAP4 protocol is different with POP3 protocol. First of all, IMAP4 supports retrieving email from different mail folder and folder management. Secondly, IMAP4 supports mail flags management. Therefore, we can do more things with IMAP4 server. To better understand the IMAP4 protocol, please see the following examples.

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 from IMAP4 inbox]

The following example codes demonstrate how to download email from IMAP4 server default mailbox. 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

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("imap4.emailarchitect.net",
        "test@emailarchitect.net", "testpassword", ServerProtocol::Imap4 );
    MailClient ^oClient = gcnew MailClient("TryIt");

    // Set IMAP4 server port
    oServer->Port = 143;

    // If your IMAP4 server requires SSL connection,
    // Please add the following codes:
    // oServer->SSLConnection = true;
    // oServer->Port = 993;

    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 IMAP4 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 IMAP server.
            oClient->Delete(info);
        }

        // Quit and purge emails marked as deleted from IMAP server.
        oClient->Quit();
    }
    catch (Exception ^ep)
    {
        Console::WriteLine(ep->Message);
    }

    return 0;
}

Because IMAP4 protocol supports folder access, so we can retrieve email from other mailbox rather than default “INBOX”. POP3 protocol doesn’t support this feature.

[C++/CLI/CLR Example - Retrieve email from “Deleted Items”]

The following example codes demonstrate how to retrieve emails from “Deleted Items” in an IMAP4 account. 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

Imap4Folder^ SearchFolder(array<Imap4Folder^> ^folders, String^ name)
{
    int count = folders->Length;
    for (int i = 0; i < count; i++)
    {
        Imap4Folder^ folder = folders[i];
        Console::WriteLine(folder->FullPath);

        // Folder was found.
        if (String::Compare(folder->Name, name) == 0)
            return folder;

        folder = SearchFolder(folder->SubFolders, name);
        if (folder != nullptr)
            return folder;
    }

    // No folder found
    return nullptr;
}

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("imap4.emailarchitect.net",
        "test@emailarchitect.net", "testpassword", ServerProtocol::Imap4 );
    MailClient ^oClient = gcnew MailClient("TryIt");

    // Set IMAP4 server port
    oServer->Port = 143;

    // If your IMAP4 server requires SSL connection,
    // Please add the following codes:
    // oServer->SSLConnection = true;
    // oServer->Port = 993;

    try
    {
        oClient->Connect(oServer);

        // Lookup folder based name.
        Imap4Folder ^folder = SearchFolder( oClient->Imap4Folders, "Deleted Items" );
        if( folder == nullptr )
        {
            throw gcnew Exception( "No folder found!");
        }

        // Select this folder
        oClient->SelectFolder( folder );

        // Retrieve emails from selected folder instead of default folder.
        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 IMAP4 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 IMAP server.
            oClient->Delete(info);
        }

        // Quit and purge emails marked as deleted from IMAP server.
        oClient->Quit();
    }
    catch (Exception ^ep)
    {
        Console::WriteLine(ep->Message);
    }

    return 0;
}

Next Section

At next section I will introduce how to retrieve email from Exchange Server with Web Service protocol.

Appendix

Comments

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