Pascal (Lazarus/Delphi)

Imap.GetMailSize vs Email.Size

Shows how to get the total size of an email, as well as the sizes of the attachments. This can be done when either full-emails or headers-only are downloaded. 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.EmailBundle,
  Chilkat.Imap,
  Chilkat.Email,
  Chilkat.MessageSet;

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

procedure RunDemo;
var
  success: Boolean;
  imap: TImap;
  fetchUids: Boolean;
  messageSet: TMessageSet;
  bundle: TEmailBundle;
  headersOnly: Boolean;
  email: TEmail;
  i: Integer;
  j: Integer;
  numEmails: Integer;
  numAttach: Integer;
  attachSize: Integer;

begin
  success := False;

  //  This example assumes the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  imap := TImap.Create;

  //  Connect to an IMAP server.
  //  Use TLS
  imap.Ssl := True;
  imap.Port := 993;
  success := imap.Connect('imap.example.com');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  Login
  success := imap.Login('****','****');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  Select an IMAP mailbox
  success := imap.SelectMailbox('Inbox');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  Get the message IDs of all the emails in the mailbox
  //  We can choose to fetch UIDs or sequence numbers.
  fetchUids := True;
  messageSet := TMessageSet.Create;
  success := imap.QueryMbx('ALL',fetchUids,messageSet);
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  When downloading headers, each email object contains
  //  (obviously) the headers, but the body will be missing.
  //  Attachments will not be included.  However, it is
  //  possible to get information about the attachments
  //  as well as the complete size of the email.
  bundle := TEmailBundle.Create;
  headersOnly := True;
  success := imap.FetchMsgSet(headersOnly,messageSet,bundle);
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  Loop over the email objects and display information about each:
  email := TEmail.Create;
  i := 0;
  j := 0;
  numEmails := bundle.MessageCount;
  while i < numEmails do
    begin
      bundle.EmailAt(i,email);

      //  Display the From and Subject
      WriteLn(email.From);
      WriteLn(email.Subject);

      //  Display the recipients:
      j := 0;
      while j < email.NumTo do
        begin
          WriteLn('TO: ' + email.GetToName(j) + ', ' + email.GetToAddr(j));
          j := j + 1;
        end;

      j := 0;
      while j < email.NumCC do
        begin
          WriteLn('CC: ' + email.GetCcName(j) + ', ' + email.GetCcAddr(j));
          j := j + 1;
        end;

      //  Show the total size of the email, including body and attachments:
      WriteLn(email.Size);

      //  When a full email is downloaded, we would use the
      //  email.NumAttachments property in conjunction with the
      //  email.GetMailAttach* methods.
      //  However, when an email object contains only the header,
      //  we need to access the attachment info differently:
      numAttach := imap.GetMailNumAttach(email);
      j := 0;
      while j < numAttach do
        begin
          WriteLn(imap.GetMailAttachFilename(email,j));
          attachSize := imap.GetMailAttachSize(email,j);
          WriteLn('    size = ' + attachSize + ' bytes');
          j := j + 1;
        end;

      WriteLn('--');

      i := i + 1;
    end;

  //  Disconnect from the IMAP server.
  success := imap.Disconnect();


  imap.Free;
  messageSet.Free;
  bundle.Free;
  email.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.