procedure createPDF();
var
  DC : Variant;
  RVal : Integer;
  docToConvert : String;
begin
  docToConvert := 'd:\test.ps';

  try
    DC := CreateOleObject('Neevia.docCreator');
    DC.setParameter('DocumentOutputFormat', 'PDF');
    DC.setParameter('DocumentOutputName', 'testPS_Delphi');
    DC.setParameter('DocumentOutputFolder', 'd:\');

    RVal := DC.setInputDocument(docToConvert);
    If (RVal <> 0) Then
      ShowMessage('Error while creating document!!! Code: '+IntToStr(RVal))
    else
      ShowMessage('Done converting !!!');
  finally
    DC := Unassigned;
  end;
end;