Java

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
    //  listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
    //  StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
    //  server.

    CkMailMan mailman = new CkMailMan();

    //  Configure the POP3 server connection.
    mailman.put_MailHost("pop.example.com");
    mailman.put_MailPort(995);
    mailman.put_PopSsl(true);
    mailman.put_PopUsername("user@example.com");
    mailman.put_PopPassword("myPassword");

    //  Build the set of UIDLs to fetch.
    CkStringTable uidls = new CkStringTable();
    uidls.Append("0000000123abcdef");
    uidls.Append("0000000124abcdef");

    //  Fetch the listed messages (full bodies) into a bundle.
    //  headersOnly=false (fetch the entire message).
    //  Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
    //  body to include along with the headers).  When headersOnly is false, the entire message
    //  is fetched and numBodyLines is ignored.
    CkEmailBundle bundle = new CkEmailBundle();

    success = mailman.FetchUidlSet(uidls,false,0,bundle);
    if (success == false) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    int n = bundle.get_MessageCount();
    System.out.println("Fetched " + n + " messages.");

    CkEmail email = new CkEmail();
    int i;
    for (i = 0; i <= n - 1; i++) {
        success = bundle.EmailAt(i,email);
        System.out.println(email.subject());
        }

    //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
    //  connects and authenticates -- using the property settings above -- whenever a server
    //  operation requires it.  Calling the explicit connect/authenticate methods can still be
    //  helpful to determine whether a failure occurs while connecting or while authenticating.
  }
}