(Node.js) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

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

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var success = false;

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

    var imap = new chilkat.Imap();

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

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

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

    // Get the message IDs of all the emails in the mailbox
    // We can choose to fetch UIDs or sequence numbers.
    var fetchUids = true;
    var messageSet = new chilkat.MessageSet();
    success = imap.QueryMbx("ALL",fetchUids,messageSet);
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    var numFound = messageSet.Count;
    if (numFound == 0) {
        console.log("No messages found.");
        return;
    }

    // Get the 1st 10 messages in messageSet.
    var upperBound = 10;
    if (numFound < upperBound) {
        upperBound = numFound;
    }

    var i = 0;
    var bUid = messageSet.HasUids;
    var headerOnly = true;
    var email = new chilkat.Email();

    while (i < upperBound) {

        success = imap.FetchEmail(headerOnly,messageSet.GetId(i),bUid,email);
        if (success == false) {
            console.log(imap.LastErrorText);
            return;
        }

        console.log(i + ": " + email.Subject);

        i = i+1;
    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();

}

chilkatExample();