title: PHPExcel returns empty PDF file
body: <p>I have a project based on PHPExcel and I want to have two output types: .xls and .pdf. The .xls output is working great, no problem with that, but as soon as I want to output the result as a .pdf file, it's not working... the final .pdf file is a 0B file, so total empty.</p>
  
  <p>Here is the PDF writer (tcPDF, located in the /var/www/tcpdf directory) inicializaion part at the beginning of the file:</p>
  
  <pre><code>/** Include PHPExcel */
  require_once 'scripts/PHPExcel.php';
  
  /** Include path **/
  set_include_path(get_include_path() . PATH_SEPARATOR . '../../../Classes/');
  
  /** PHPExcel_IOFactory */
  include 'scripts/PHPExcel/IOFactory.php';
  
  $objPHPExcel = new PHPExcel();
  
  $rendererName = PHPExcel_Settings::PDF_RENDERER_TCPDF;
  $rendererLibrary = 'tcpdf';
  $rendererLibraryPath = $rendererLibrary;
  if (!PHPExcel_Settings::setPdfRenderer(
          $rendererName,
          $rendererLibraryPath
      )) {
      die(
          'Please set the $rendererName and $rendererLibraryPath values' .
          PHP_EOL .
          ' as appropriate for your directory structure'
      );
  }
  </code></pre>
  
  <p>Here comes the manipulation functions, so skip these... </p>
  
  <p>This is the output section:</p>
  
  <pre><code>$objPHPExcel-&gt;setActiveSheetIndex(0);
  
  if($_GET['format'] == 'xls'){
  
      header('Content-Type: application/vnd.ms-excel');
      header('Content-Disposition: attachment;filename="bs-export.xls"');
  
      $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
      $objWriter-&gt;save('php://output');
      exit;
  }
  
  if($_GET['format'] == 'pdf'){
  
      header('Content-Type: application/pdf');
      header('Content-Disposition: attachment;filename="bs-export.pdf"');
  
      $objWriter = new PHPExcel_Writer_PDF($objPHPExcel);
      $objWriter = PHPExcel_IOFactory::createWriter($objPHPexcel, 'PDF'); 
      $objWriter-&gt;setSheetIndex(0);
      $objWriter-&gt;save('php://output');
      exit;
  }
  </code></pre>
  
  <p>Can someone help me out here what could be the problem?</p>
  
  <p>Thank you very much!!</p>
  
  <p><strong>EDIT:</strong> I didn't notice it had some variable name errors... so I corrected the </p>
  
  <pre><code>$objWriter = PHPExcel_IOFactory::createWriter($objPHPexcel, 'PDF'); 
  </code></pre>
  
  <p>line to :</p>
  
  <pre><code>$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'PDF'); 
  </code></pre>
  
  <p>After this the PDF file isn't 0B site anymore, but its't still a blank page... The XLS output is okay.</p>
  
  <p><strong>EDIT2:</strong> Very strange... This returns a total blank page too:</p>
  
  <pre><code>$objWriter = new PHPExcel_Writer_HTML($objPHPExcel);
  $objWriter-&gt;save("pdf-test.htm");
  </code></pre>