Fetch a Single Message's MIME into a StringBuilder

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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.

import 'package:chilkat/chilkat.dart';

void main() {
  // 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).

  final imap = CkImap();

  imap.ssl = true;
  imap.port = 993;

  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.login('user@example.com', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.selectMailbox('Inbox');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Search for the message ids to download, returning UIDs.
  final wantUids = true;
  final msgSet = CkMessageSet();
  try {
    imap.queryMbx('ALL', wantUids, msgSet);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  if (msgSet.count > 0) {
    final uid = msgSet.getId(0);

    // Download the message's MIME into a StringBuilder.  The id is a UID.
    final useUid = true;
    final sbMime = CkStringBuilder();
    try {
      imap.fetchSingleAsMimeSb(uid, useUid, sbMime);
    } on ChilkatException catch (e) {
      print(e.lastErrorText);
      return;
    }

    print('MIME length: ${sbMime.length} chars');
  }

  try {
    imap.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}