Pascal (Lazarus/Delphi)

Check if a MIME Part is an Attachment

Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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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.Mime;

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

procedure RunDemo;
var
  success: Boolean;
  mime: TMime;
  n: Integer;
  part: TMime;
  i: Integer;

begin
  success := False;

  //  Demonstrates the Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
  //  part.  This example iterates the parts of a multipart message and reports which ones match.

  mime := TMime.Create;
  success := mime.LoadMimeFile('qa_data/multipart_message.eml');
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  n := mime.NumParts;
  part := TMime.Create;

  for i := 0 to n - 1 do
    begin
      success := mime.PartAt(i,part);
      if (success = False) then
        begin
          WriteLn(mime.LastErrorText);
          Exit;
        end;
      if (part.IsAttachment()) then
        begin
          WriteLn('Part ' + i + ' (' + part.ContentType + ') is an attachment.');
        end;
    end;



  mime.Free;
  part.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.