Pascal (Lazarus/Delphi)

Fetch Inbox Email Headers

Downloads the headers of all emails in the Inbox and shows some information about each, such as From, Subject, and whether the email has been seen (already read) or not. 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;

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

procedure RunDemo;
var
  success: Boolean;
  imap: TImap;
  count: Integer;
  bundle: TEmailBundle;
  emailHeader: TEmail;
  i: Integer;
  seenFlag: Integer;

begin
  success := False;

  //  This example requires 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('myLogin','myPassword');
  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;

  //  Normally, when an email is downloaded, its "Seen" flag is automatically set.
  //  We don't want our program to be interfering with the "Seen" flags.
  //  To do this, set the PeekMode to True.
  imap.PeekMode := True;

  //  After selecting the mailbox, the NumMessages property
  //  will contain the number of emails in the mailbox.
  //  When sequence numbers (not UIDs) are used to reference emails,
  //  they range from 1 to N, where N is the number of messages in the mailbox.
  //  This example will download the headers by sequence numbers.
  count := imap.NumMessages;

  bundle := TEmailBundle.Create;
  success := imap.FetchRange(True,1,count,bundle);
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  if (bundle.MessageCount = 0) then
    begin
      WriteLn('No messages in Inbox.');
      Exit;
    end;

  //  Loop over the email headers.  
  emailHeader := TEmail.Create;
  i := 0;
  while i < bundle.MessageCount do
    begin

      bundle.EmailAt(i,emailHeader);

      WriteLn(emailHeader.From);
      WriteLn(emailHeader.Subject);

      //  Get the "Seen" flag.
      //  When an email is fetched from the IMAP server, the email flags are stored
      //  within the email in the "ckx-imap-flags" header.
      //  The call to GetMailFlag is simply getting the information from the email header.
      //  (it is not communicating with the IMAP server to get this information, because
      //  the information was obtained when downloading the headers)
      seenFlag := imap.GetMailFlag(emailHeader,'Seen');
      if (seenFlag = 1) then
        begin
          WriteLn('This email has been read (already seen)');
        end
      else
        begin
          WriteLn('This email has not yet been read (it is not yet seen)');
        end;

      //  We can also look directly at the "ckx-imap-flags" header:
      WriteLn('ckx-imap-flags: ' + emailHeader.GetHeaderField('ckx-imap-flags'));

      WriteLn('--');

      i := i + 1;
    end;

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


  imap.Free;
  bundle.Free;
  emailHeader.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.