Fetch a Single Message's MIME into a StringBuilder

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Demonstrates the Chilkat Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a StringBuilder. The first argument is the message id, the second (bUid) selects UID vs sequence number, and the third is the StringBuilder, which is cleared first. This example downloads a message by UID and prints the MIME length.

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.StringBuilder,
  Chilkat.Imap,
  Chilkat.MessageSet;

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

procedure RunDemo;
var
  success: Boolean;
  imap: TImap;
  wantUids: Boolean;
  msgSet: TMessageSet;
  uid: LongWord;
  useUid: Boolean;
  sbMime: TStringBuilder;

begin
  success := False;

  //  Demonstrates the Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a
  //  StringBuilder.  The 1st argument is the message id, the 2nd (bUid) selects UID vs sequence
  //  number, and the 3rd is the StringBuilder (cleared first).

  imap := TImap.Create;

  imap.Ssl := True;
  imap.Port := 993;

  success := imap.Connect('imap.example.com');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;
  success := imap.Login('user@example.com','myPassword');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  success := imap.SelectMailbox('Inbox');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  Search for the message ids to download, returning UIDs.
  wantUids := True;
  msgSet := TMessageSet.Create;
  success := imap.QueryMbx('ALL',wantUids,msgSet);
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  if (msgSet.Count > 0) then
    begin
      uid := msgSet.GetId(0);

      //  Download the message's MIME into a StringBuilder.  The id is a UID.
      useUid := True;
      sbMime := TStringBuilder.Create;
      success := imap.FetchSingleAsMimeSb(uid,useUid,sbMime);
      if (success = False) then
        begin
          WriteLn(imap.LastErrorText);
          Exit;
        end;
      WriteLn('MIME length: ' + sbMime.Length + ' chars');
    end;

  success := imap.Disconnect();
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;


  imap.Free;
  msgSet.Free;
      sbMime.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.