(JavaScript) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

Note: This example requires Chilkat v11.0.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var imap = new CkImap();

// Connect using TLS.
imap.Ssl = true;
imap.Port = 993;
success = imap.Connect("imap.example.com");
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

// Authenticate
success = imap.Login("email_account_login","email_account_password");
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

// Search for messages and return a set of matching messages.
// (This example will simply search for ALL messages.)
var fetchUids = true;

var messageSet = new CkMessageSet();
success = imap.QueryMbx("ALL",fetchUids,messageSet);
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

console.log("Number of messages = " + messageSet.Count);

var email = new CkEmail();
var i = 0;
while (i < messageSet.Count) {
    success = imap.FetchEmail(false,messageSet.GetId(i),fetchUids,email);
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    console.log(email.From + "; " + email.Subject);

    i = i+1;
}

console.log("OK");