Delphi ActiveX

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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var
success: Integer;
mailman: TChilkatMailMan;
uidls: TChilkatStringTable;
bundle: TChilkatEmailBundle;
n: Integer;
email: TChilkatEmail;
i: Integer;

begin
success := 0;

//  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.

mailman := TChilkatMailMan.Create(Self);

//  Configure the POP3 server connection.
mailman.MailHost := 'pop.example.com';
mailman.MailPort := 995;
mailman.PopSsl := 1;
mailman.PopUsername := 'user@example.com';
mailman.PopPassword := 'myPassword';

//  Build the set of UIDLs to fetch.
uidls := TChilkatStringTable.Create(Self);
uidls.Append('0000000123abcdef');
uidls.Append('0000000124abcdef');

//  Fetch the listed messages (full bodies) into a bundle.
//  headersOnly=0 (fetch the entire message).
//  Note: numBodyLines only applies when headersOnly is 1 (it sets how many lines of the
//  body to include along with the headers).  When headersOnly is 0, the entire message
//  is fetched and numBodyLines is ignored.
bundle := TChilkatEmailBundle.Create(Self);

success := mailman.FetchUidlSet(uidls.ControlInterface,0,0,bundle.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

n := bundle.MessageCount;
Memo1.Lines.Add('Fetched ' + IntToStr(n) + ' messages.');

email := TChilkatEmail.Create(Self);

for i := 0 to n - 1 do
  begin
    success := bundle.EmailAt(i,email.ControlInterface);
    Memo1.Lines.Add(email.Subject);
  end;

//  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.