Pascal (Lazarus/Delphi)

Download the Full Version of a Partial Email

Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.MailMan,
  Chilkat.Email;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  partialEmail: TEmail;
  fullEmail: TEmail;

begin
  success := False;

  //  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
  //  header-only or partial Email and stores it in a second Email.  The full result includes
  //  the complete body and any attachments.  The partial email must retain its UIDL.

  mailman := TMailMan.Create;

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

  //  First fetch message 1 as headers only (a fast preview).  headerOnly=True.
  partialEmail := TEmail.Create;

  success := mailman.FetchOne(True,0,1,partialEmail);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;
  WriteLn('Preview subject: ' + partialEmail.Subject);

  //  Now download the complete message (body and attachments).
  fullEmail := TEmail.Create;
  success := mailman.FetchFull(partialEmail,fullEmail);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;
  WriteLn('Full email NumAttachments: ' + fullEmail.NumAttachments);

  //  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.


  mailman.Free;
  partialEmail.Free;
  fullEmail.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.