title: Error when i wont to save file as PDF using PHPExcel
body: <p>I'm using the PHPExcel library in my project and its work fine when i wont to save files format (xls/xlsx). But I need to save files as a PDF format and i found some examples but none of them is working for me.
  here the code which i use to generate file with pdf format  </p>
  
  <pre><code>&lt;?php
  
  error_reporting(E_ALL);
  
  ini_set('include_path', ini_get('include_path').';../Classes/');
  
  include 'PHPExcel/Classes/PHPExcel/IOFactory.php';
  
      $inputFileName = 'file.xls';
  
          try {
                 $inputFileType = PHPExcel_IOFactory::identify($inputFileName);
                 $objReader = PHPExcel_IOFactory::createReader($inputFileType);
                 $objPHPExcel = $objReader-&gt;load($inputFileName);
          } catch(Exception $e) {
                 die('Error loading file "'.pathinfo($inputFileName,PATHINFO_BASENAME).'": '.$e-&gt;getMessage());
          }
  
  $objPHPExcel-&gt;setActiveSheetIndex(0);
  $row = $objPHPExcel-&gt;getActiveSheet()-&gt;getHighestRow()+1;
  
          $sheet = $objPHPExcel-&gt;getSheet(0); 
          $highestRow = $sheet-&gt;getHighestRow(); 
          $highestColumn = $sheet-&gt;getHighestColumn();
  
  $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'PDF');
  
  $objSheet = $objPHPExcel-&gt;getActiveSheet();
  
  $objPHPExcel-&gt;getActiveSheet()-&gt;SetCellValue('A1', 'test test');
  
  $objWriter-&gt;save('test100.pdf');
  
  ?&gt;
  </code></pre>
  
  <p>and here what the browser show me </p>
  
  <pre><code>( ! ) Fatal error: Uncaught exception 'PHPExcel_Writer_Exception' with message 'PDF Rendering library has not been defined.' in C:\wamp\www\projet\PHPExcel\Classes\PHPExcel\Writer\PDF.php on line 56
  </code></pre>
  
  <p>what did  i do wrong</p>