JavaScript

Fetch a Single Message's MIME into a StringBuilder

Demonstrates the Chilkat Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a StringBuilder. The first argument is the message id, the second (bUid) selects UID vs sequence number, and the third is the StringBuilder, which is cleared first. This example downloads a message by UID and prints the MIME length.

Background: Chilkat interprets the received MIME as UTF-8. Messages using Base64 or quoted-printable transfer encoding are safe because their encoded bytes are ASCII. Raw 8bit or binary content, or unencoded text in a charset such as ISO-8859-1 or Shift_JIS, can be misinterpreted — in those cases use FetchSingleBd to get the exact bytes.

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.

JavaScript

var success = false;

//  Demonstrates the Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a
//  StringBuilder.  The 1st argument is the message id, the 2nd (bUid) selects UID vs sequence
//  number, and the 3rd is the StringBuilder (cleared first).

var imap = new CkImap();

imap.Ssl = true;
imap.Port = 993;

success = imap.Connect("imap.example.com");
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

success = imap.Login("user@example.com","myPassword");
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

success = imap.SelectMailbox("Inbox");
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

//  Search for the message ids to download, returning UIDs.
var wantUids = true;
var msgSet = new CkMessageSet();
success = imap.QueryMbx("ALL",wantUids,msgSet);
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}

if (msgSet.Count > 0) {
    var uid = msgSet.GetId(0);

    //  Download the message's MIME into a StringBuilder.  The id is a UID.
    var useUid = true;
    var sbMime = new CkStringBuilder();
    success = imap.FetchSingleAsMimeSb(uid,useUid,sbMime);
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    console.log("MIME length: " + sbMime.Length + " chars");
}

success = imap.Disconnect();
if (success == false) {
    console.log(imap.LastErrorText);
    return;
}