对于特定的 pdf，php 中的想象异常？

Question

i am using imagick library to convert pdf to jpeg images but imagick gives exception for a particular pdf file.

An uncaught Exception was encountered Type: ImagickException

Message: Failed to read the file.

link to my pdf file is: http://3.16.128.27/wesign/files/33e75ff09dd601bbe69f351039152189/group-1572499418b6192849b6ed8bcc333842d4faba342b.pdf

Answer 1

Your PDF file uses a deprecated method for defining resources; it relies on inheritance from a parent object.

Each page in your file does more or less nothing except execute a Form XObject. In many cases these XObjects do nothing but execute yet more XObjects. In any event eventually we reach an XObject which does some drawing. Some of thohse XObjects use resources, such as fonts, but do not declare a Resources dictionary to tell the PDF consumer how to locate the named resource. Instead they rely on inheriting the Resources dictionary from the parent.

This is legal, though deprecated.

Its possible that you are simply using an old version of Ghostscript which doesn't like this construction. The current version is 9.50 and you could try simply upgrading.

Other than that you'll need to debug the delegate call, I think -debug all will provide at least some information but I'm not an expert on imagemagick