问Imagick多页PDF到JPG致命错误

EN

<?php

  // this does work for a single page file
  // it does NOT work for multiple page file
  // it does NOT work when using pdffile.pdf[0]
  // it DOES work when using pdffile.pdf[1]

  $filename = '/path/to/pdffile.pdf';  
  $im = new Imagick();
  $im->readImage($filename);
  $im = $im->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
  $im->scaleImage(150, 150, true);
  $im->writeImage('/path/to/image/pdffile.jpg');
?>


<?php
  // i used alternative code which gave me the second /tmp/ dir error (see above)

  $filename = '/path/to/pdffile.pdf';    
  $pdf_handle = fopen($filename, 'rb');
  $doc_preview = new Imagick();
  $doc_preview->setResolution(150,150);
  $doc_preview->readImageFile($pdf_handle);
  $doc_preview->setIteratorIndex(0);
  $doc_preview->setImageFormat('jpeg');
  $doc_preview->writeImage('/path/to/image/pdffile.jpg');
  $doc_preview->clear();
  $doc_preview->destroy();

?>