/**
  * Split an interval of pages in a self definable format
  * @param int $from
  * @param int $to
  * @param string $format
  * @throws Exception
  */
 public function splitPagesToAnyFormat($from, $to, $format)
 {
     try {
         if ($this->fileName == "") {
             throw new Exception("File name not specified");
         }
         $strURI = Product::$baseProductUri . "/pdf/" . $this->fileName . "/split?from=" . $from . "&to=" . $to . "&format=" . $format;
         $signedURI = Utils::Sign($strURI);
         $responseStream = Utils::processCommand($signedURI, "POST", "", "");
         $json = json_decode($responseStream);
         $i = 1;
         $resultFiles = array();
         $info = pathinfo($this->fileName);
         foreach ($json->Result->Documents as $splitPage) {
             $splitFileName = basename($splitPage->Href);
             $strURI = Product::$baseProductUri . '/storage/file/' . $splitFileName;
             $signedURI = Utils::Sign($strURI);
             $responseStream = Utils::processCommand($signedURI, "GET", "", "");
             $fileName = $info['filename'] . "_" . $i . "." . $format;
             $outputFile = SaasposeApp::$outputLocation . $fileName;
             Utils::saveFile($responseStream, $outputFile);
             $resultFiles[$i] = $outputFile;
             $i++;
         }
         return $resultFiles;
     } catch (Exception $e) {
         throw new Exception($e->getMessage());
     }
 }